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WELCHOL
(colesevelam hydrochloride) Tablets and Oral Suspension
WELCHOL (colesevelam hydrochloride) is a non-absorbed, polymeric, lipid-lowering and glucoselowering agent intended for oral administration. Colesevelam hydrochloride is a high-capacity bile acid-binding molecule.
Colesevelam hydrochloride is poly(allylamine hydrochloride) cross-linked with epichlorohydrin and alkylated with 1-bromodecane and (6-bromohexyl)-trimethylammonium bromide. The chemical name (IUPAC) of colesevelam hydrochloride is allylamine polymer with 1-chloro-2,3-epoxypropane, [6- (allylamino)-hexyl]trimethylammonium chloride and N-allyldecylamine, hydrochloride. The chemical structure of colesevelam hydrochloride is represented by the following formula:
 |
wherein (a) represents allyl amine monomer units that have not been alkylated by either of the 1- bromodecane or (6-bromohexyl)-trimethylammonium bromide alkylating agents or cross linked by epichlorohydrin; (b) represents allyl amine units that have undergone cross-linking with epichlorohydrin; (c) represents allyl amine units that have been alkylated with a decyl group; (d) represents allyl amine units that have been alkylated with a (6-trimethylammonium) hexyl group, and m represents a number ≥ 100 to indicate an extended polymer network. A small amount of the amines are dialkylated, and are not depicted in the formula above. No regular order of the groups is implied by the structure; cross-linking and alkylation are expected to occur randomly along the polymer chains. A large amount of the amines are protonated. The polymer is depicted in the hydrochloride form; a small amount of the halides are bromide. Colesevelam hydrochloride is hydrophilic and insoluble in water.
WELCHOL Tablets are an off-white, oval, film-coated, solid tablet containing 625 mg colesevelam hydrochloride. In addition, each tablet contains the following inactive ingredients: magnesium stearate, microcrystalline cellulose, silicon dioxide, HPMC (hydroxypropyl methylcellulose), and acetylated monoglyceride. The tablets are imprinted using a water-soluble black ink.
WELCHOL for Oral Suspension is a citrus-flavored, white to pale yellow powder containing yellow granules packaged in single-dose packets containing either 1.875 gram or 3.75 gram colesevelam hydrochloride. In addition, each packet contains the following inactive ingredients: lemon flavor, orange flavor, propylene glycol alginate, simethicone, aspartame, citric acid, medium chain triglycerides, and magnesium trisilicate.
WELCHOL for Oral Suspension contains 13.5 mg phenylalanine per 1.875 gram dose and 27 mg phenylalanine per 3.75 gram dose.
WELCHOL is indicated as an adjunct to diet and exercise to reduce elevated low-density lipoproteincholesterol (LDL-C) in adults with primary hyperlipidemia (Fredrickson Type IIa) as monotherapy or in combination with a hydroxymethyl-glutaryl-coenzyme A (HMG CoA) reductase inhibitor (statin).
WELCHOL is indicated as monotherapy or in combination with a statin to reduce LDL-C levels in boys and postmenarchal girls, 10 to 17 years of age, with heterozygous familial hypercholesterolemia if after an adequate trial of diet therapy the following findings are present:
Lipid-altering agents should be used in addition to a diet restricted in saturated fat and cholesterol whenresponse to diet and non-pharmacological interventions alone has been inadequate [See Clinical Studies].
In patients with coronary heart disease (CHD) or CHD risk equivalents such as diabetes mellitus, LDLC treatment goals are < 100 mg/dL. An LDL-C goal of < 70 mg/dL is a therapeutic option on the basis of recent trial evidence. If LDL-C is at goal but the serum triglyceride (TG) value is > 200 mg/dL, then non-HDL cholesterol (non-HDL-C) (total cholesterol [TC] minus high density lipoprotein cholesterol [HDL-C]) becomes a secondary target of therapy. The goal for non-HDL-C in persons with high serumTG is set at 30 mg/dL higher than that for LDL-C.
WELCHOL is indicated as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus [See Clinical Studies].
Diabetes mellitus is considered a CHD risk equivalent. In addition to glycemic control, intensive lipid control is warranted [See Primary Hyperlipidemia and WARNINGS AND PRECAUTIONS].
The recommended dose of WELCHOL Tablets in adults, whether used as monotherapy or in combination with a statin, is 6 tablets once daily or 3 tablets twice daily. WELCHOL Tablets should be taken with a meal and liquid.
The recommended dose of WELCHOL for Oral Suspension, in adults and children 10 to 17 years of age, is one 3.75 gram packet once daily or one 1.875 gram packet twice daily. To prepare, empty the entire contents of one packet into a glass or cup. Add ½ to 1 cup (4 to 8 ounces) of water, fruit juice, or diet soft drinks. Stir well and drink. WELCHOL for Oral Suspension should be taken with meals. To avoid esophageal distress, WELCHOL for Oral Suspension should not be taken in its dry form. Due to tablet size, it is recommended that any patient who has difficulty swallowing tablets use WELCHOL for Oral Suspension.
WELCHOL can be dosed at the same time as a statin or the two drugs can be dosed apart [See Clinical Studies].
After initiation of WELCHOL, lipid levels should be analyzed within 4 to 6 weeks.
The recommended dose of WELCHOL Tablets is 6 tablets once daily or 3 tablets twice daily. WELCHOL should be taken with a meal and liquid.
The recommended dose of WELCHOL for Oral Suspension is one 3.75 gram packet once daily or one 1.875 gram packet twice daily. To prepare, empty the entire contents of one packet into a glass or cup. Add ½ to 1 cup (4 to 8 ounces) of water, fruit juice, or diet soft drinks. Stir well and drink. WELCHOL for Oral Suspension should be taken with meals. To avoid esophageal distress, WELCHOL for Oral Suspension should not be taken in its dry form.
Tablets: 625 mg tablets are off-white, oval, film-coated and imprinted with “Sankyo” and “C01” on one side.
Oral Suspension: a white to pale yellow powder containing yellow granules packaged in singledose packets: 3.75 gram single-dose packet, 1.875 gram single-dose packet.
WELCHOL (colesevelam hydrochloride) Tablets, 625 mg, are supplied as an off-white, solid tablet imprinted with the word “Sankyo” and “C01” on one side. WELCHOL tablets are available as follows:
Bottles of 180 - NDC 65597-701-18
Store at 25°C (77°F); excursions permitted to 15-30°C (59-86°F) [see USP Controlled Room Temperature]. Brief exposure to 40°C (104°F) does not adversely affect the product. Protect from moisture.
WELCHOL (colesevelam hydrochloride) for Oral Suspension is a white to pale yellow powder containing yellow granules. WELCHOL for Oral Suspension is available as follows:
1.875 gram single-dose packet Cartons of 60 packets – NDC
65597-903-60
3.75 gram single-dose packet Cartons of 30 packets – NDC
65597-902-30
Store at 25°C (77°F); excursions permitted to 15-30°C (59-86°F) [see USP Controlled Room Temperature]. Protect from moisture.
Marketed by: Daiichi Sankyo, Inc. Parsippany, New Jersey 07054. Revised: Jan 2014
Because clinical studies are conducted under widely varying conditions, adverse reaction ratesobserved in the clinical studies of a drug cannot be directly compared to rates in clinical studies of another drug and may not reflect the rates observed in practice.
In 7 double-blind, placebo-controlled, clinical trials, 807 patients with primary hyperlipidemia (age range 18-86 years, 50% women, 90% Caucasians, 7% Blacks, 2% Hispanics, 1% Asians) and elevated LDL-C were treated with WELCHOL 1.5 g/day to 4.5 g/day from 4 to 24 weeks (total exposure 199 patient-years).
In clinical trials for the reduction of LDL-C, 68% of patients receiving WELCHOL vs. 64% of patients receiving placebo reported an adverse reaction.
Table 1 : Placebo-Controlled Clinical Studies of
WELCHOL for Primary Hyperlipidemia: Advers e Reactions Reported in ≥ 2%
of Patients and More Commonly than in Patients Given Placebo, Regardless of
Investigator Assessment of Causality
| Number of Patients (%) | ||
| WELCHOL N = 807 |
Placebo N = 258 |
|
| Constipation | 89 (11.0) | 18 (7.0) |
| Dyspepsia | 67 (8.3) | 9 (3.5) |
| Nausea | 34 (4.2) | 10 (3.9) |
| Accidental injury | 30 (3.7) | 7 (2.7) |
| Asthenia | 29 (3.6) | 5 (1.9) |
| Pharyngitis | 26 (3.2) | 5 (1.9) |
| Flu syndrome | 26 (3.2) | 8 (3.1) |
| Rhinitis | 26 (3.2) | 8 (3.1) |
| Myalgia | 17 (2.1) | 1 (0.4) |
In an 8-week double-blind, placebo-controlled study boys and post menarchal girls, 10 to 17 years of age, with heterozygous familial hypercholesterolemia (heFH) (n=192), were treated with WELCHOL tablets (1.9-3.8 g, daily) or placebo tablets [See Clinical Studies].
Table 2 : Placebo-Controlled Clinical Study of WELCHOL
for Primary Hyperlipidemia in heFH Pediatric Patients : Adverse Reactions Reported
in ≥ 2% of Patients and More Commonly than in Patients Given Placebo,
Regardless of Investigator Assessment of Causality
| Number of Patients (%) | ||
| WELCHOL N = 129 |
Placebo N = 65 |
|
| Nasopharyngitis | 8 (6.2) | 3 (4.6) |
| Headache | 5 (3.9) | 2 (3.1) |
| Fatigue | 5 (3.9) | 1 (1.5) |
| Creatine Phosphokinase Increase | 3 (2.3) | 0 (0.0) |
| Rhinitis | 3 (2.3) | 0 (0.0) |
| Vomiting | 3 (2.3) | 1 (1.5) |
The reported adverse reactions during the additional 18-week open-label treatment period with WELCHOL 3.8 g per day were similar to those during the double-blind period and included headache (7.6%), nasopharyngitis (5.4%), upper respiratory tract infection (4.9%), influenza (3.8%), and nausea (3.8%) [See Clinical Studies].
The safety of WELCHOL in patients with type 2 diabetes mellitus was evaluated in 5 add-on combination and 1 monotherapy double-blind, 12-26 week, placebo-controlled clinical trials [see Clinical Studies]. In these studies 1022 patients were exposed to WELCHOL. The mean exposure duration was 20 weeks (total exposure 393 patient-years). Patients were to receive 3.8 grams of WELCHOL per day. The mean age of patients exposed to WELCHOL was 55.7 years, 52.8 percent of the population was male and 61.9% were Caucasian, 4.8% were Asian, and 15.9% were Black or African American. At baseline the population had a mean HbA1C of 8.2% and 26% had past medical history suggestive of microvascular complications of diabetes. Baseline characteristics in the placebo group were comparable.
In clinical trials of type 2 diabetes, 57% of patients receiving WELCHOL vs. 52% of patients receiving placebo reported an adverse reaction.
Table 3 shows common adverse reactions associated with the use of WELCHOL in the 1015 patients with type 2 diabetes. These adverse reactions were not present at baseline, occurred more commonly on WELCHOL than on placebo, and occurred in at least 2% of patients treated with WELCHOL.
Table 3 : Placebo-Controlled Clinical Studies of
WELCHOL for Type 2 Diabetes : Adverse Reactions Reported in ≥ 2% of
Patients and More Commonly than in Patients Given Placebo, Regardless of Investigator
Assessment of Causality
| Number of Patients (%) | ||
| WELCHOL N = 1015 |
Placebo N = 1010 |
|
| Constipation | 66 (6.5) | 22 (2.2) |
| Hypoglycemia | 35 (3.4) | 31 (3.1) |
| Dyspepsia | 28 (2.8) | 10 (1.0) |
| Nausea | 26 (2.6) | 16 (1.6) |
| Hypertension | 26 (2.6) | 19 (1.9) |
| Back Pain | 23 (2.3) | 13 (1.3) |
A total of 5.3% of WELCHOL-treated patients and 3.6% of placebo-treated patients were discontinued from the diabetes trials due to adverse reactions. This difference was driven mostly by gastrointestinal adverse reactions such as abdominal pain and constipation.
One patient in the add-on to sulfonylurea trial discontinued due to body rash and mouth blistering that occurred on the first day of dosing of WELCHOL, which may represent a hypersensitivity reaction to WELCHOL.
Hypertriglyceridemia: Patients with fasting serum TG levels above 500 mg/dL were excluded from the diabetes clinical trials. In the diabetes trials, 1292 (67.7%) patients had baseline fasting serum TG levels less than 200 mg/dL, 426 (22.3%) had baseline fasting serum TG levels between 200 and less than 300 mg/dL, 175 (9.2%) had baseline fasting serum TG levels between 300 and 500 mg/dL, and 16 (0.8%) had fasting serum TG levels greater than or equal to 500 mg/dL. The median baseline fasting TG concentration for the study population was 160 mg/dL; the median post-treatment fasting TG was 180 mg/dL in the WELCHOL group and 162 mg/dL in the placebo group. WELCHOL therapy resulted in a median placebo-corrected increase in serum TG of 9.7% (p=0.03) in the monotherapy study and of 5% (p=0.22), 11% (p < 0.001), 18% (p < 0.001), and 22% (p < 0.001), when added to metformin, pioglitazone, sulfonylureas, and insulin, respectively [See WARNINGS AND PRECAUTIONS and Clinical Studies]. In comparison, WELCHOL resulted in a median increase in serum TG of 5% compared to placebo (p=0.42) in a 24-week monotherapy lipid-lowering trial [See Clinical Studies].
Treatment-emergent fasting TG concentrations ≥ 500 mg/dL occurred in 0.9% of WELCHOL-treated patients compared to 0.7% of placebo-treated patients in the diabetes trials. Among these patients, the TG concentrations with WELCHOL (median 606 mg/dL; interquartile range 570-794 mg/dL) were similar to that observed with placebo (median 663 mg/dL; interquartile range 542-984 mg/dL). Five (0.6%) patients on WELCHOL and 3 (0.3%) patients on placebo developed TG elevations ≥ 1000 mg/dL. In all WELCHOL clinical trials, including studies in patients with type 2 diabetes and patients with primary hyperlipidemia, there were no reported cases of acute pancreatitis associated with hypertriglyceridemia. It is unknown whether patients with more uncontrolled, baseline hypertriglyceridemia would have greater increases in serum TG levels with WELCHOL [See CONTRAINDICATIONS and WARNINGS AND PRECAUTIONS].
Cardiovascular adverse events: During the diabetes clinical trials, the incidence of patients with treatment-emergent serious adverse events involving the cardiovascular system was 2.2% (22/1015) in the WELCHOL group and 1% (10/1010) in the placebo group. These overall rates included disparate events (e.g., myocardial infarction, aortic stenosis, and bradycardia); therefore, the significance of this imbalance is unknown.
The following additional adverse reactions have been identified during post-approval use of WELCHOL. Because these reactions are reported voluntarily from a population of uncertain size, it is generally not possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
Drug Interactions with Concomitant WELCHOL Administration include:
Bowel obstruction (in patients with a history of bowel obstruction or resection), dysphagia (tablet and oral suspension formulations) or esophageal obstruction (occasionally requiring medical intervention), fecal impaction, pancreatitis, abdominal distension, exacerbation of hemorrhoids, and increased transaminases.
Hypertriglyceridemia
Table 4 lists the drugs that have been tested in in vitro binding, in vivo drug interaction studies with colesevelam and/or drugs with postmarketing reports consistent with potential drug-drug interactions. Orally administered drugs that have not been tested for interaction with colesevelam, especially those with a narrow therapeutic index, should also be administered at least 4 hours prior to WELCHOL. Alternatively, the physician should monitor drug levels of the co-administered drug.
Table 4 : Drugs Tested in In Vitro Binding or In Vivo Drug
Interaction Testing or With Post- Marketing Reports
| Drugs with a known interaction with colesevelam: Decrease in exposure of coadministered drug |
cyclosporinec, glimepiridea, glipizidea, glyburidea, levothyroxinea, olmesartan medoxomila, and oral contraceptives containing ethinyl estradiol and norethindronea |
| Drugs with a known interaction with colesevelam: Increase in exposure of coadministered drug |
metformin extended release (ER)d |
| Drug(s) with postmarketing reports consistent with potential drug-drug interactions when coadministered with WELCHOL | phenytoina, warfarinb |
| Drugs that do not interact with colesevelam based on in vitro or in vivo testing | aspirin, atenolol, cephalexin, ciprofloxacin, digoxin, enalapril, fenofibrate, lovastatin, metformin, metoprolol, phenytoina, pioglitazone, rosiglitazone, quinidine, repaglinide, sitagliptin, valproic acid, verapamil, warfarinb |
| aShould be administered at least 4 hours prior
to WELCHOL bNo significant alteration of warfarin drug levels with warfarin and WELCHOL coadministration in an in vivo study which did not evaluate warfarin pharmacodynamics (INR). [See Post-marketing Experience] cCyclosporine levels should be monitored and, based on theoretical grounds, cyclosporine should be administered at least 4 hours prior to WELCHOL. dPatients receiving concomitant metformin ER and colesevelam should be monitored for clinical response as is usual for the use of anti-diabetes drugs. |
|
In an in vivo drug interaction study, WELCHOL and warfarin coadministration had no effect on warfarin drug levels. This study did not assess the effect of WELCHOL and warfarin coadministration on INR. In post-marketing reports, concomitant use of WELCHOL and warfarin has been associated with reduced INR. Therefore, in patients on warfarin therapy, the INR should be monitored before initiating WELCHOL and frequently enough during early WELCHOL therapy to ensure that no significant alteration in INR occurs. Once the INR is stable, continue to monitor the INR at intervals usually recommended for patients on warfarin [See Post-marketing Experience].
Included as part of the PRECAUTIONS section.
The effect of WELCHOL on cardiovascular morbidity and mortality has not been determined.
WELCHOL, like other bile acid sequestrants, can increase serum TG concentrations.
WELCHOL had small effects on serum TG (median increase 5% compared to placebo) in trials of patients with primary hyperlipidemia [See ADVERSE REACTIONS and Clinical Studies].
In clinical trials in patients with type 2 diabetes, greater increases in TG levels occurred when WELCHOL was used as monotherapy (median increase 9.7% compared to placebo) and when WELCHOL was used in combination with pioglitazone (median increase 11% compared to placebo in combination with pioglitazone), sulfonylureas (median increase 18% compared to placebo in combination with sulfonylureas), and insulin (median increase 22% compared to placebo in combination with insulin) [See ADVERSE REACTIONS and Clinical Studies]. Hypertriglyceridemia of sufficient severity can cause acute pancreatitis. The long-term effect of hypertriglyceridemia on the risk of coronary artery disease is uncertain. In patients with type 2 diabetes, the effect of WELCHOL on LDLC levels may be attenuated by WELCHOL's effects on TG levels and a smaller reduction in non HDL-C compared to the reduction in LDL-C. Caution should be exercised when treating patients with TG levels greater than 300 mg/dL. Because most patients in the WELCHOL clinical trials had baseline TG < 300 mg/dL, it is unknown whether patients with more uncontrolled baseline hypertriglyceridemia would have greater increases in serum TG levels with WELCHOL. In addition, the use of WELCHOL is contraindicated in patients with TG levels > 500 mg/dL [See CONTRAINDICATIONS]. Lipid parameters, including TG levels and non-HDL-C, should be obtained before starting WELCHOL and periodically thereafter. WELCHOL should be discontinued if TG levels exceed 500 mg/dL or if the patient develops hypertriglyceridemia-induced pancreatitis [See ADVERSE REACTIONS].
Bile acid sequestrants may decrease the absorption of fat-soluble vitamins A, D, E, and K. No specific clinical studies have been conducted to evaluate the effects of WELCHOL on the absorption of coadministered dietary or supplemental vitamin therapy. In non-clinical safety studies, rats administered colesevelam hydrochloride at doses greater than 30-fold the projected human clinical dose experienced hemorrhage from vitamin K deficiency. Patients on oral vitamin supplementation should take their vitamins at least 4 hours prior to WELCHOL. Caution should be exercised when treating patients with a susceptibility to deficiencies of vitamin K (e.g., patients on warfarin, patients with malabsorption syndromes) or other fat-soluble vitamins.
Because of its constipating effects, WELCHOL is not recommended in patients with gastroparesis, other gastrointestinal motility disorders, and in those who have had major gastrointestinal tract surgery and who may be at risk for bowel obstruction. Because of the tablet size, WELCHOL Tablets can cause dysphagia or esophageal obstruction and should be used with caution in patients with dysphagia or swallowing disorders. To avoid esophageal distress, WELCHOL for Oral Suspension should not be taken in its dry form. Always mix WELCHOL for Oral Suspension with water, fruit juice, or diet soft drinks before ingesting.
WELCHOL reduces gastrointestinal absorption of some drugs. Drugs with a known interaction withcolesevelam should be administered at least 4 hours prior to WELCHOL. Drugs that have not been tested for interaction with colesevelam, especially those with a narrow therapeutic index, should also be administered at least 4 hours prior to WELCHOL. Alternatively, the physician should monitor drug levels of the co-administered drug [See DRUG INTERACTIONS and CLINICAL PHARMACOLOGY].
WELCHOL for Oral Suspension contains 13.5 mg phenylalanine per 1.875 gram packet and 27 mg phenylalanine per 3.75 gram packet [See DESCRIPTION].
There have been no clinical studies establishing conclusive evidence of macrovascular disease risk reduction with WELCHOL or any other antidiabetic drugs.
A 104-week carcinogenicity study with colesevelam hydrochloride was conducted in CD-1 mice, at oral dietary doses up to 3 g/kg/day. This dose was approximately 50 times the maximum recommended human dose of 4.5 g/day, based on body weight, mg/kg. There were no significant druginduced tumor findings in male or female mice. In a 104-week carcinogenicity study with colesevelam hydrochloride in Harlan Sprague-Dawley rats, a statistically significant increase in the incidence of pancreatic acinar cell adenoma was seen in male rats at doses > 1.2 g/kg/day (approximately 20 times the maximum human dose, based on body weight, mg/kg) (trend test only). A statistically significant increase in thyroid C-cell adenoma was seen in female rats at 2.4 g/kg/day (approximately 40 times the maximum  human dose, based on body weight, mg/kg).
Colesevelam hydrochloride and 4 degradants present in the drug substance have been evaluated for mutagenicity in the Ames test and a mammalian chromosomal aberration test. The 4 degradants and an extract of the parent compound did not exhibit genetic toxicity in an in vitro bacterial mutagenesis assay in S. typhimurium and E. coli (Ames assay) with or without rat liver metabolic activation. An extract of the parent compound was positive in the Chinese Hamster Ovary (CHO) cell chromosomal aberration assay in the presence of metabolic activation and negative in the absence of metabolic activation. The results of the CHO cell chromosomal aberration assay with 2 of the 4 degradants, decylamine HCl and aminohexyltrimethyl ammonium chloride HCl, were equivocal in the absence of metabolic activation and negative in the presence of metabolic activation. The other 2 degradants, didecylamine HCl and 6-decylamino-hexyltrimethyl ammonium chloride HCl, were negative in the presence and absence of metabolic activation.
Colesevelam hydrochloride did not impair fertility in rats at doses up to 3 g/kg/day (approximately 50 times the maximum human dose, based on body weight, mg/kg).
Pregnancy Category B. There are no adequate and well-controlled studies of colesevelam use in pregnant women. Animal reproduction studies in rats and rabbits revealed no evidence of fetal harm. Requirements for vitamins and other nutrients are increased in pregnancy. However, the effect of colesevelam on the absorption of fat-soluble vitamins has not been studied in pregnant women. This drug should be used during pregnancy only if clearly needed.
In animal reproduction studies, colesevelam revealed no evidence of fetal harm when administered to rats and rabbits at doses 50 and 17 times the maximum human dose, respectively. Because animal reproduction studies are not always predictive of human response, this drug should be used in pregnancy only if clearly needed.
Colesevelam hydrochloride is not expected to be excreted in human milk because colesevelam hydrochloride is not absorbed systemically from the gastrointestinal tract.
The safety and effectiveness of WELCHOL as monotherapy or in combination with a statin were evaluated in children, 10 to 17 years of age with heFH [See Clinical Studies]. The adverse reaction profile was similar to that of patients treated with placebo. In this limited controlled study, there were no significant effects on growth, sexual maturation, fat-soluble vitamin levels or clotting factors in the adolescent boys or girls relative to placebo [See ADVERSE REACTIONS].
Due to tablet size, WELCHOL for Oral Suspension is recommended for use in the pediatric population. Dose adjustments are not required when WELCHOL is administered to children 10 to 17 years of age.
WELCHOL has not been studied in children younger than 10 years of age or in pre-menarchal girls.
Primary Hyperlipidemia: Of the 1350 patients enrolled in the hyperlipidemia clinical studies, 349 (26%) were ≥ 65 years old, and 58 (4%) were ≥ 75 years old. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
Type 2 Diabetes Mellitus: Of the 2048 patients enrolled in the six diabetes studies, 397 (19%) were ≥ 65 years old, and 36 (2%) were ≥ 75 years old. In these trials, WELCHOL 3.8 g/day or placebo was added onto background anti-diabetic therapy. No overall differences in safety or effectiveness were observed between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
No special considerations or dosage adjustments are recommended when WELCHOL is administered to patients with hepatic impairment.
Type 2 Diabetes Mellitus: Of the 2048 patients enrolled in the six diabetes studies, 807 (39%) had mild renal insufficiency (creatinine clearance [CrCl] 50- < 80 mL/min), 61 (3%) had moderate renal insufficiency (CrCl 30- < 50 mL/min), and none had severe renal insufficiency (CrCl < 30 mL/min), as estimated from baseline serum creatinine using the Modification of Diet in Renal Disease (MDRD) equation. No overall differences in safety or effectiveness were observed between patients with CrCl < 50 mL/min (n=53) and those with a CrCl ≥ 50 mL/min (n=1075) in the add-on to metformin, sulfonylureas, and insulin diabetes studies. In the monotherapy study and add-on to pioglitazone study only 3 and 5 patients respectively had moderate renal insufficiency
Doses of WELCHOL in excess of 4.5 g/day have not been tested. Because WELCHOL is not absorbed, the risk of systemic toxicity is low. However, excessive doses of WELCHOL may cause more severe local gastrointestinal effects (e.g., constipation) than recommended doses.
WELCHOL is contraindicated in patients with
Colesevelam hydrochloride, the active pharmaceutical ingredient in WELCHOL, is a non-absorbed, lipid-lowering polymer that binds bile acids in the intestine, impeding their reabsorption. As the bile acid pool becomes depleted, the hepatic enzyme, cholesterol 7-α- hydroxylase, is upregulated, which increases the conversion of cholesterol to bile acids. This causes an increased demand for cholesterol in the liver cells, resulting in the dual effect of increasing transcription and activity of the cholesterol biosynthetic enzyme, HMG-CoA reductase, and increasing the number of hepatic LDL receptors. These compensatory effects result in increased clearance of LDL-C from the blood, resulting in decreased serum LDL-C levels. Serum TG levels may increase or remain unchanged.
The mechanism by which WELCHOL improves glycemic control is unknown.
A maximum therapeutic response to the lipid-lowering effects of WELCHOL was achieved within 2 weeks and was maintained during long-term therapy. In the diabetes clinical studies, a therapeutic response to WELCHOL, as reflected by a reduction in hemoglobin A1C (A1C), was initially noted following 4-6 weeks of treatment and reached maximal or near maximal effect after 12-18 weeks of treatment.
Colesevelam hydrochloride is a hydrophilic, water-insoluble polymer that is not hydrolyzed by digestive enzymes and is not absorbed.
Colesevelam hydrochloride is not absorbed, and therefore, its distribution is limited to the gastrointestinal tract.
Colesevelam hydrochloride is not metabolized systemically and does not interfere with systemic drug-metabolizing enzymes such as cytochrome P-450.
In 16 healthy volunteers, an average of 0.05% of administered radioactivity from a single 14C-labeled colesevelam hydrochloride dose was excreted in the urine.
Drug interactions between colesevelam and concomitantly administered drugs were screened through in vitro studies and confirmed in in vivo studies. In vitro studies demonstrated that cephalexin, metformin, and ciprofloxacin had negligible binding to colesevelam hydrochloride. Therefore, an in vivo pharmacokinetic interaction of WELCHOL with these drugs is unlikely. WELCHOL was found to have no significant effect on the bioavailability of aspirin, atenolol, digoxin, enalapril, fenofibrate, lovastatin, metoprolol, phenytoin, pioglitazone, quinidine, rosiglitazone, sitagliptin, valproic acid, and warfarin. The results of additional in vivo drug interactions of WELCHOL are presented in Table 5.
Table 5 : Mean Change in Drug Exposure (AUC0-∞
and Cmax ) when Administered with WELCHOL (3.75 g)a
| Drug | Dose | Co-administered | 1 hr prior to WELCHOL | 4 hr prior to WELCHOL | |||
| AUC0-∞ | Cmax | AUC0-∞ | Cmax | AUC0-∞ | Cmax | ||
| Cyclosporine | 200 mg | -34% | -44% | N/A | N/A | N/A | N/A |
| Ethinyl Estradiol* b | 0.035 mg | -24% | -24% | -18% | -1% | -12% | 0% |
| Glimepiride b | 4 mg | -18% | -8% | N/A | N/A | -6% | 3% |
| Glipizide b | 20 mg | -12% | -13% | N/A | N/A | -4% | 0% |
| Glyburide b | 3 mg | -32% | -47% | -20% | -15% | -7% | 4% |
| Levothyroxine b | 600 pg | -22% | -33% | 6% | -2% | 1% | 8% |
| Metformin ER c | 1500 mg | 44% | 8% | N/A | N/A | N/A | N/A |
| Norethindrone* b | 1 mg | -1% | -20% | 5% | -3% | 6% | 7% |
| Olmesartan Medoxomilb | 40 mg | -39% | -28% | N/A | N/A | -15% | -4% |
| Repaglinide | 2 mg | -7% | -19% | -6% | -1% | N/A | N/A |
| Verapamil sustained-release | 240 mg | -31% | -11% | N/A | N/A | N/A | N/A |
| aWith verapamil, the dose of WELCHOL was 4.5 g bShould be administered at least 4 hours prior to WELCHOL [See DRUG INTERACTIONS]. cPatients receiving concomitant metformin ER and colesevelam should be monitored for clinical response as is usual for the use of anti-diabetes drugs [See DRUG INTERACTIONS]. dCyclosporine levels should be monitored and, based on theoretical grounds, cyclosporine should be administered at least 4 hours prior to WELCHOL [See DRUG INTERACTIONS]. * Oral contraceptive containing norethindrone and ethinyl estradiol. N/A – Not Available |
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Reproduction studies have been performed in rats and rabbits at doses up to 3 g/kg/day and 1 g/kg/day, respectively (approximately 50 and 17 times the maximum human dose, based on body weight, mg/kg) and have revealed no evidence of harm to the fetus due to colesevelam hydrochloride.
WELCHOL reduces TC, LDL-C, apolipoprotein B (Apo B), and non-HDL-C when administered alone or in combination with a statin in patients with primary hyperlipidemia.
Approximately 1600 patients were studied in 9 clinical trials with treatment durations ranging from 4 to 50 weeks. With the exception of one open-label, uncontrolled, long term extension study, all studies were multicenter, randomized, double-blind, and placebo controlled. A maximum therapeutic response to WELCHOL was achieved within 2 weeks and was maintained during long-term therapy.
In a study in patients with LDL-C between 130 mg/dL and 220 mg/dL (mean 158 mg/dL), WELCHOL was given for 24 weeks in divided doses with the morning and evening meals.
As shown in Table 6, the mean LDL-C reductions were 15% and 18% at the 3.8 g and 4.5 g doses. The respective mean TC reductions were 7% and 10%. The mean Apo B reductions were 12% in both treatment groups. WELCHOL at both doses increased HDL-C by 3%. Increases in TG of 9-10% were observed at both WELCHOL doses but the changes were not statistically different from placebo.
Table 6 : Response to WELCHOL Monotherapy in a 24-Week
Trial Percent Change in Lipid Parameters from Baseline
| Grams/Day | N | TC | LDL-C | Apo B | HDL-Ca | Non-HDL-C | TGa |
| Placebo | 88 | +1 | 0 | 0 | -1 | +1 | +5 |
| 3.8 g (6 tablets) | 95 | —7* | -15* | -12* | +3* | -10* | +10 |
| 4.5 g (7 tablets) | 94 | -10* | -18* | -12* | +3 | -13* | +9 |
| p < 0.05 for lipid parameters compared to placebo, for
Apo B compared to baseline. aMedian % change from baseline. |
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In a study in 98 patients with LDL-C between 145 mg/dL and 250 mg/dL (mean 169 mg/dL), WELCHOL 3.8 g was given for 6 weeks as a single dose with breakfast, as a single dose with dinner, or as divided doses with breakfast and dinner. The mean LDL-C reductions were 18%, 15%, and 18% for the 3 dosing regimens, respectively. The reductions with these 3 regimens were not statistically different from one another.
Co-administration of WELCHOL and a statin (atorvastatin, lovastatin, or simvastatin) in 3 clinical studies demonstrated an additive reduction of LDL-C. The mean baseline LDLC was 184 mg/dL in the atorvastatin study (range 156-236 mg/dL), 171 mg/dL in the lovastatin study (range 115-247 mg/dL), and 188 mg/dL in the simvastatin study (range 148-352 mg/dL). As demonstrated in Table 7, WELCHOL doses of 2.3 g to 3.8 g resulted in an additional 8% to 16% reduction in LDL-C above that seen with the statin alone.
Table 7 : Response to WELCHOL in Combination with
Atorvastatin, Simvastatin, or Lovastatin Percent Change in Lipid Parameters
| Dose/Day | N | TC | LDL-C | Apo B | HDL-Ca | Non-HDL-C | TGa |
| Atorvastatin Trial (4-week) | |||||||
| Placebo | 19 | +4 | +3 | -3 | +4 | +4 | +10 |
| Atorvastatin 10 mg | 18 | -27* | -38* | -32* | +8 | -35* | -24* |
| WELCHOL 3.8 g/ Atorvastatin 10 mg | 18 | -31* | -48* | -38* | +11 | -40* | -1 |
| Atorvastatin 80 mg | 20 | -39* | -53* | -46* | +6 | -50* | -33* |
| Simvastatin T rial (6-week) | |||||||
| Placebo | 33 | -2 | -4 | -4* | -3 | -2 | +6* |
| Simvastatin 10 mg | 35 | -19* | -26* | -20* | +3* | -24* | -17* |
| WELCHOL 3.8 g/ | 34 | -28* | -42* | -33* | +10* | -37* | -12* |
| Simvastatin 10 mg | |||||||
| Simvastatin 20 mg | 39 | -23* | -34* | -26* | +7* | -30* | -12* |
| WELCHOL 2.3 g/Simvastatin 20 mg | 37 | -29* | -42* | -32* | +4* | -37* | -12* |
| Lovastatin Trial (4-week) | |||||||
| Placebo | 26 | +1 | 0 | 0 | +1 | +1 | +1 |
| Lovastatin 10 mg | CN | * - | -22* | -16* | +5 | -19* | 0 |
| WELCHOL 2.3 g/ Lovastatin 10 mg Together | 27 | -21* | -34* | -24* | +4 | -27* | -1 |
| WELCHOL 2.3 g/ Lovastatin 10 mg Apart | 23 | -21* | -32* | -24* | +2 | -28* | -2 |
| *p < 0.05 for lipid parameters compared to placebo, for
Apo B compared to baseline. aMedian % change from baseline. |
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In all 3 studies, the LDL-C reduction achieved with the combination of WELCHOL and any given dose of statin therapy was statistically superior to that achieved with WELCHOL or that dose of the statin alone. The LDL-C reduction with atorvastatin 80 mg was not statistically significantly different from the combination of WELCHOL 3.8 g and atorvastatin 10 mg.
The effect of WELCHOL when added to fenofibrate was assessed in 122 patients with mixed hyperlipidemia (Fredrickson Type IIb). Inclusion in the study required LDL-C ≥ 115 mg/dL and TG 150 mg/dL to 749 mg/dL. Patients were treated with 160 mg of fenofibrate during an 8-week open-label runin period and then randomly assigned to receive fenofibrate 160 mg plus either WELCHOL 3.8 g or placebo for 6 weeks of double-blind treatment. The overall mean LDL-C at the start of randomized treatment was 144 mg/dL. The results of the study are summarized in Table 8.
Table 8 : Response to WELCHOL Added to Fenofibrate in
Patients with Mixed Hyperlipidemia (Mean % Change from Treated Baseline at 6
Weeks )
| N | TC | LDL-C | Apo B | HDL-C | Non-HDL-C | TGa | |
| Placebo + Fenofibrate 160 mg | 61 | 2 | 2 | 1 | -1 | 2 | -3 |
| WELCHOL + Fenofibrate 160 mg | 61 | -6* | -10* | -7* | -0 | -8* | 6 |
| *p ≤ 0.0002 compared to placebo. aFor triglycerides, median % change from baseline. bTreated Baseline: following 8-week treatment with open-label fenofibrate 160 mg. |
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Pediatric Therapy: The safety and efficacy of WELCHOL in pediatric patients were evaluated in an 8- week, multi-center, randomized, double-blind, placebo-controlled, parallel-group study followed by an open-label phase, in 194 boys and postmenarchal girls 10-17 years of age (mean age 14.1 years) with heterozygous familial hypercholesterolemia (heFH), taking a stable dose of an FDA-approved statin (with LDL-C > 130 mg/dL) or naïve to lipid lowering therapy (with LDL-C > 160 mg/dL). This study had 3 periods: a single-blind, placebo stabilization period; an 8-week, randomized, double-blind, parallelgroup, placebo-controlled treatment period; and an 18-week, open-label treatment period. Forty-seven (24%) patients were taking statins and 147 (76%) patients were statin-naïve at screening. The mean baseline LDL-C at Day 1 was approximately 199 mg/dL.
During the double-blind treatment period, patients were assigned randomly to treatment: WELCHOL 3.8 g/day (n=64), WELCHOL 1.9 g/day (n=65), or placebo (n=65). In total, 186 patients completed the double-blind treatment period. After 8 weeks of treatment, WELCHOL 3.8 g/day significantly decreased plasma levels of LDL-C, non-HDL-C, TC, and Apo B and significantly increased HDL-C. A moderate, non-statistically significant increase in TG was observed versus placebo (Table 9).
Table 9 : Response to WELCHOL 3.8 g Compared to
Placebo in Pediatric Patients 10-17 Years of Age – Mean Percent Change in Lipid
Parameters from Baseline to Week 8
| Treatment Difference | TC (N=128) |
LDL-C (N=128) |
Apo B (N=124) |
HDL-C (N=128) |
Non-HDL- C (N=128) |
TGa (N=128) |
| WELCHOL 3.8 g vs Placebo | -7* | -13* | -8* | +6* | -11* | +5 |
| *p ≤ 0.05 for lipid parameters compared to placebo Values represent LS mean. Only patients with values at both study baseline and endpoint are included in this table. Study baseline was defined as the last value measured before or on Day 1 prior to the first dose of randomized study medication. aFor triglycerides, median % change from baseline. Results were based on the ITT population with LOCF |
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During the open-label treatment period patients were treated with WELCHOL 3.8 g/day. In total, 173 (89%) patients completed 26 weeks of treatment. Results at Week 26 were consistent with those at Week 8.
WELCHOL has been studied as monotherapy and in combination with metformin, pioglitazone, sulfonylureas, and insulin. In these studies, WELCHOL and placebo were administered either as 3 tablets twice daily with lunch and dinner or as 6 tablets with dinner alone.
The efficacy of WELCHOL 3.8 g/day as anti-diabetes monotherapy was evaluated in a randomized double-blind, placebo-controlled trial involving 357 patients (176 WELCHOL and 181 placebo) with T2DM who were treatment-naïve or had not received antihyperglycemic medication within 3 months prior to the start of the study. Statin use at baseline was reported in 13% of the WELCHOL-treated patients and 16% of the placebo-treated patients.
WELCHOL resulted in a statistically significant reduction in A1C of 0.27% compared to placebo (Table 10).
The mean baseline LDL-C was 121 mg/dL in the monotherapy trial. WELCHOL treatment resulted in a placebo-corrected 11% reduction in LDL-C. WELCHOL treatment also reduced serum TC, ApoB, and non-HDL-C (Table 11). The mean change in body weight was -0.6 kg for WELCHOL and -0.7 kg for placebo treatment groups.
Table 10 : Glycemic Parameters in a 24-Week
Placebo-Controlled Study of WELCHOL Monotherapy in Patients with Type 2
Diabetes
| WELCHOL 3.8 g/day | Placebo | |
| A1C (%), Mean | ||
| N | 175 | 169 |
| Baseline | 8.25 | 8.17 |
| Change from baselinea | -0.26 | 0.01 |
| Treatment difference (p-value) | -0.27 (p=0.013) | |
| FPG (mg/dL), Mean | ||
| N | 172 | 166 |
| Baseline | 172 | 168 |
| Change from baselinea | -4.6 | 5.7 |
| Treatment difference (p-value) | -10.3 (p=0.037b) | |
| aLeast-squares mean change calculated from an
Analysis of Covariance model bNominal p=value, not controlled for multiplicity testing. A1C = hemoglobin A1C, FPG = fasting plasma glucose |
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Table 11 : Percent Change in Lipid Parameters in a
24-Week Placebo-Controlled Study of WELCHOL Monotherapy in Patients with Type 2
Diabetes
| Dose/Day | N† | TC | LDL-C | Apo B | HDL-C | Non-HDL-C | TGa |
| WELCHOL 3.8 g | 162 | -3.3* | -10.0* | -5.6* | 1.7 | -4.4* | 15.5 |
| Placebo | 160 | 1.8 | 1.2 | 0.9 | -0.1 | 3.0 | 5.8 |
| *p < 0.001 for lipid parameters compared to placebo
(this more stringent criterion for statistical significance accounts for
multiplicity testing of the lipid parameters, which were secondary endpoints in
the diabetes trials) aMedian % change from baseline. †The number of patients with analyzable data, i.e., a baseline and post-treatment value (last-observation carried forward), varied slightly among different parameters. The N given represents the smallest number of patients included in the analysis for any parameter. |
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The efficacy of WELCHOL 3.8 g/day in patients with type 2 diabetes mellitus was evaluated in 5 double-blind, placebo-controlled add-on therapy trials involving a total of 1691 patients with baseline A1C 7.5-9.5%. Patients were enrolled and maintained on their pre-existing, stable, background anti-diabetic regimen. Statin use at baseline was reported in 41% of the WELCHOLtreated patients and 48% of the placebo-treated patients.
In 3 add-on combination therapy trials (metformin, sulfonylurea and insulin), treatment with WELCHOL resulted in a statistically significant reduction in A1C of 0.5% compared to placebo. Similar placebocorrected reductions in A1C occurred in patients who received WELCHOL in combination with metformin, sulfonylurea, or insulin monotherapy or combinations of these therapies with other antidiabetic agents. In the pioglitazone trial, treatment with WELCHOL resulted in a statistically significant reduction in A1C of 0.32% compared to placebo. In the metformin, pioglitazone, and sulfonylurea trials, treatment with WELCHOL also resulted in statistically significant reductions in fasting plasma glucose (FPG) of at least 14 mg/dL compared to placebo.
WELCHOL had consistent effects on A1C across subgroups of age, gender, race, body mass index, and baseline A1C. WELCHOL's effects on A1C were also similar for the two dosing regimens (3 tablets with lunch and with dinner or 6 tablets with dinner alone).
The mean baseline LDL-C was 104 mg/dL in the metformin study (range 32-214 mg/dL), 107 mg/dL in the pioglitazone study (range 48-263 mg/dL), 106 mg/dL in the sulfonylurea study (range 41-264 mg/dL), 102 mg/dL in the insulin study (range 35-204 mg/dL). In these trials, WELCHOL treatment was associated with a 12% to 16% reduction in LDL-C levels. The percentage decreases in LDL-C were of similar magnitude to those observed in patients with primary hyperlipidemia. WELCHOL treatment was associated with statistically significant increases in TG levels in the studies of patients on insulin, patients on a sulfonylurea, and patients on pioglitazone but not in the study of patients on metformin. The clinical significance of these increases is unknown. WELCHOL is contraindicated in patients with TG levels > 500 mg/dL [See CONTRAINDICATIONS ] and periodic monitoring of lipid parameters including TG and non-HDL-C levels is recommended [See WARNINGS AND PRECAUTIONS and ADVERSE REACTIONS].
Body weight did not significantly increase from baseline with WELCHOL therapy, compared with placebo, in any of the add-on combination diabetes studies.
WELCHOL 3.8 g/day or placebo was added to background anti-diabetic therapy in a 26-week trial of 316 patients already receiving treatment with metformin alone (N=159) or metformin in combination with other oral agents (N=157). A total of 60% of these patients were receiving ≥ 1,500 mg/day of metformin. In combination with metformin, WELCHOL resulted in statistically significant placebo-corrected reductions in A1C and FPG (Table 12). WELCHOL also reduced TC, LDL-C, Apo B, and non-HDL-C (Table 13). The mean percent change in serum LDL-C levels with WELCHOL compared to placebo was -16% among statin users and statin non-users; the median percent change in serum TG levels with WELCHOL compared to placebo was -2% among statin users and 10% among statin non-users. The mean change in body weight was -0.5 kg for WELCHOL and -0.3 kg for placebo.
Table 12 : Glycemic Parameters in a 26-Week
Placebo-Controlled Study of WELCHOL in Combination with Metformin in Patients
with Type 2 Diabetes
| Total Patient Population | Metformin Alone | Metformin in Combination with Other Oral Anti-Diabetic Agents | ||||
| WELCHOL 3.8 g/day | Placebo | WELCHOL3.8 g/day | Placebo | WELCHOL 3.8 g/day | Placebo | |
| A1C (%), Mean | ||||||
| N | 148 | 152 | 79 | 76 | 69 | 76 |
| Baseline | 8.1 | 8.1 | 8.2 | 8.2 | 8.1 | 8.0 |
| Change from baselinea | -0.4 | 0.2 | -0.4 | 0.0 | -0.4 | 0.3 |
| Treatment difference (pvalue) | -0.5 (p < 0.001) | -0.5 (p=0.002) | -0.6 (p < 0.001) | |||
| FPG (mg/dL), Mean | ||||||
| N | 149 | 152 | 79 | 76 | 70 | 76 |
| Baseline | 178 | 174 | 184 | 180 | 171 | 168 |
| Change from baselinea | -3 | 11 | -7 | 8 | 0 | 13 |
| Treatment difference (p-value) | -14 (p=0.01) | -14 (p=0.07) | -14 (p=0.10) | |||
| aLeast-squares mean change calculated from an
Analysis of Covariance model. A1C = hemoglobin A1C, FPG = fasting plasma glucose |
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Table 13 : Percent Change in Lipid Parameters in a
26-Week Placebo-Controlled Study of WELCHOL in Combination with Metformin in
Patients with Type 2 Diabetes
| Dose/Day | N† | TC | LDL-C | Apo B | HDL-C | Non-HDL- C | TGa |
| Total Patient Population | |||||||
| WELCHOL 3.8 g | 125 | -4* | -12* | -4* | 1 | -6* | 12 |
| Placebo | 126 | 3 | 4 | 4 | 0 | 5 | 7 |
| Metformin Alone | |||||||
| WELCHOL 3.8 g | 66 | -3 | -9 | -2 | 1 | -4 | 15 |
| Placebo | 61 | 2 | 0 | 1 | -2 | 4 | 8 |
| Metformin in Combination with Other Oral Anti-diabetic Agents | |||||||
| WELCHOL 3.8 g | 59 | -6* | -15* | -6* | 1 | -7* | 8 |
| Placebo | 65 | 4 | 7 | 7 | 2 | 6 | 5 |
| *p < 0.001 for lipid parameters compared to placebo
(this more stringent criterion for statistical significance accounts for
multiplicity testing of the lipid parameters, which were secondary endpoints in
the diabetes trials) aMedian % change from baseline. †The number of patients with analyzable data, i.e., a baseline and post-treatment value (last-observation carried forward), varied slightly among different parameters. The N given represents the smallest number of patients included in the analysis for any parameter. |
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WELCHOL 3.8 g/day or placebo was added to background anti-diabetic therapy in a 24-week trial of 562 patients already receiving treatment with pioglitazone alone (N=51) or pioglitazone in combination with other oral agents (N=511). Of these, most were on dual therapy with metformin (N=298) or triple therapy with metformin and a sulfonylurea (N=139). In combination with pioglitazone-based therapy, WELCHOL resulted in statistically significant reductions in A1C and FPG compared to placebo (Table 14). WELCHOL also reduced TC, LDL-C, Apo B, and non-HDL-C but increased serum TG (Table 15). The mean change in body weight was 0.8 kg for WELCHOL and 0.4 kg for placebo.
Table 14 : Glycemic Parameters in a 24-Week
Placebo-Controlled Study of WELCHOL in Combination with Pioglitazone Based
Therapy in Patients with Type 2 Diabetes
| WELCHOL 3.8 g/day | Placebo | |
| A1C (%), Mean | ||
| N | 271 | 276 |
| Baseline | 8.2 | 8.1 |
| Change from baselinea | -0.34 | -0.02 |
| Treatment difference (p-value) | -0.32 (0.0001) | |
| FPG (mg/dL), Mean | ||
| N | 268 | 270 |
| Baseline | 155 | 157 |
| Change from baselinea | -4.8 | +9.9 |
| Treatment difference (p-value) | -14.7 ( < 0.0001) | |
| aLeast-squares mean change calculated from an
Analysis of Covariance model. A1C = hemoglobin A1C, FPG = fasting plasma glucose |
||
Table 15 : Percent Change in Lipid Parameters in a
24-Week Placebo-Controlled Study of WELCHOL in Combination with Pioglitazone
Based Therapy in Patients with Type 2 Diabetes
| Dose/Day | N† | TC | LDL-C | Apo B | HDL-C | Non-HDL- C | TGa |
| Total Patient Cohort | |||||||
| WELCHOL 3.8 g | 262 | -3* | -9* | -5* | +3 | -5* | +14* |
| Placebo | 262 | +3 | +7 | +4 | +1 | +5 | +2 |
| *p < 0.001 for lipid parameters compared to placebo aMedian % change from baseline †The N given represents the smallest number of patients included in the analysis for any parameter. |
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WELCHOL 3.8 g/day or placebo was added to background anti-diabetic therapy in a 26-week trial of 460 patients already treated with sulfonylurea alone (N=156) or sulfonylurea in combination with other oral agents (N=304). A total of 72% of these patients were receiving at least half-maximal doses of sulfonylurea therapy. In combination with a sulfonylurea, WELCHOL resulted in statistically significant placebo-corrected reductions in A1C and FPG (Table 16). WELCHOL also reduced TC, LDL-C, Apo B, and non-HDL-C, but increased serum TG (Table 17). The mean percent change in serum LDL-C levels with WELCHOL compared to placebo was -18% among statin users and -15% among statin non-users; the median percent increase in serum TG with WELCHOL compared to placebo was 29% among statin users and 9% among statin non-users. The mean change in body weight was 0.0 kg for WELCHOL and -0.4 kg for placebo.
Table 16 : Glycemic Parameters in a 26-Week
Placebo-Controlled Study of WELCHOL in Combination with Sulfonylurea in
Patients with Type 2 Diabetes
| Total Patient Population | Sulfonylurea Alone | Sulfonylurea in Combination with Other Oral Anti-diabetic Agents | ||||
| WELCHOL 3.8 g/day | Placebo | WELCHOL 3.8 g/day | Placebo | WELCHOL 3 .8 g /day | Placebo | |
| A1C (%), Mean | ||||||
| n | 218 | 218 | 69 | 80 | 149 | 138 |
| Baseline | 8.2 | 8.3 | 8.2 | 8.4 | 8.2 | 8.3 |
| Change from baselinea | -0.3 | 0.2 | -0.3 | 0.5 | -0.4 | 0.0 |
| Treatment difference (p-value) | -0.5 (p < 0.001) | -0.8 (p < 0.001) | -0.4 (p < 0.001) | |||
| FPG (mg/dL), Mean | ||||||
| n | 218 | 217 | 70 | 80 | 148 | 137 |
| Baseline | 177 | 181 | 181 | 186 | 175 | 178 |
| Change from baselinea | -4 | 10 | 3 | 15 | -11 | 4 |
| Treatment difference (p-value) | -14 (p=0.009) | -12(p=0.18) | -14 (p=0.03) | |||
| aLeast-squares mean change calculated from an
Analysis of Covariance model. A1C = hemoglobin A1C, FPG = fasting plasma glucose |
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Table 17 : Percent Change in Lipid Parameters in a 26-Week Placebo-Controlled Study of WELCHOL in Combination With Sulfonylurea in Patients with Type 2 Diabetes
| Dose/Day | N† | TC | LDL-C | Apo B | HDL-C | Non-HDL- C | TGa |
| Total Patient Population | |||||||
| WELCHOL 3.8 g | 186 | -5* | -16* | -6* | 1 | -6* | 20* |
| Placebo | 193 | 0 | 1 | 1 | 0 | 1 | 1 |
| Sulfonylurea Alone | |||||||
| WELCHOL 3.8 g | 57 | -5 | -14* | -5 | -1 | -6 | 17 |
| Placebo | 68 | 0 | 1 | 1 | 1 | 0 | -1 |
| Sulfonylurea in Combination with Other Oral Anti-diabetic Agents | |||||||
| WELCHOL 3.8 g | 129 | -5 | -18* | -7* | 1 | -6 | 21* |
| Placebo | 125 | 0 | 0 | 1 | 0 | 1 | 2 |
| *p < 0.001 for lipid parameters compared to placebo
(this more stringent criterion for statistical significance accounts for
multiplicity testing of the lipid parameters, which were secondary endpoints in
the diabetes trials) aMedian % change from baseline. †The number of patients with analyzable data, i.e., a baseline and post-treatment value (last-observation carried forward), varied slightly among different parameters. The N given represents the smallest number of patients included in the analysis for any parameter. |
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WELCHOL 3.8 g/day or placebo was added to background anti-diabetic therapy in a 16-week trial of 287 patients already treated with insulin alone (N=116) or insulin in combination with oral agents (N=171). At baseline, the median daily insulin dose was 70 units in the WELCHOL group and 65 units in the placebo group. In combination with insulin, WELCHOL resulted in a statistically significant placebo-corrected reduction in A1C (Table 18). WELCHOL also reduced LDL-C and Apo B, but increased serum TG (Table 19). The mean percent change in serum LDL-C levels with WELCHOL compared to placebo was -13% among statin users and statin non-users; the median percent increase in serum TG levels with WELCHOL compared to placebo was 24% among statin users and 17% among statin non-users. The mean change in body weight was 0.6 kg for WELCHOL and 0.2 kg for placebo.
Table 18 : Glycemic Parameters in a 16-Week
Placebo-Controlled Study of WELCHOL in Combination with Insulin in Patients
with Type 2 Diabetes
| Total Patient Population | Insulin Alone | Ins ulin in Combination with Oral Anti-diabetic Agents | ||||
| WELCHOL 3.8 g/day | Placebo | WELCHOL 3.8 g/day | Placebo | WELCHOL 3.8 g/day | Placebo | |
| A1C (%), Mean | ||||||
| n | 144 | 136 | 54 | 55 | 90 | 81 |
| Baseline | 8.3 | 8.2 | 8.2 | 8.3 | 8.3 | 8.2 |
| Change from baselinea | -0.4 | 0.1 | -0.4 | 0.2 | -0.4 | 0.0 |
| Treatment difference (p-value) | -0.5 (p < 0.001) | -0.6 (p < 0.001) | -0.4 (p < 0.001) | |||
| FPG (mg/dL), Mean | ||||||
| n | 144 | 136 | 54 | 55 | 90 | 81 |
| Baseline | 165 | 151 | 165 | 163 | 165 | 143 |
| Change from baselinea | 2 | 16 | 8 | 17 | -4 | 14 |
| Treatment difference (p-value) | -15 (p=0.08) | -9 (p=0.51) | -18 (p=0.09) | |||
| aLeast-squares mean change calculated from an
Analysis of Covariance model. A1C = hemoglobin A1C, FPG = fasting plasma glucose |
||||||
Table 19 : Percent Change in Lipid Parameters in a
16-Week Placebo-Controlled Study of WELCHOL in Combination with Insulin in
Patients with Type 2 Diabetes
| Dose/Day | N† | TC | LDL-C | Apo B | HDL-C | Non-HDL- C | TGa |
| Total Patient Population | |||||||
| WELCHOL 3.8 g | 129 | -3 | -12* | -4 | -1 | -3 | 23* |
| Placebo | 121 | 1 | 1 | 1 | 0 | 1 | 0 |
| Insulin Alone | |||||||
| WELCHOL 3.8 g | 46 | -3 | -12 | -5 | 0 | -3 | 19 |
| Placebo | 48 | 2 | 4 | 2 | 3 | 2 | -2 |
| Insulin in Combination with Oral Anti-diabetic Agents | |||||||
| WELCHOL 3.8 g | 83 | -4 | -13 | -4 | -1 | -3 | 25* |
| Placebo | 73 | -1 | -3 | 0 | -1 | -1 | 2 |
| *p < 0.001 for lipid parameters compared to placebo
(this more stringent criterion for statistical significance accounts for
multiplicity testing of the lipid parameters, which were secondary endpoints in
the diabetes trials) aMedian % change from baseline. †The number of patients with analyzable data, i.e., a baseline and post-treatment value (last-observation carried forward), varied slightly among different parameters. The N given represents the smallest number of patients included in the analysis for any parameter. |
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Patients should be advised to take WELCHOL Tablets with a meal and liquid. WELCHOL can be taken as 6 tablets once daily or 3 tablets twice daily. Patients should be advised to take WELCHOLfor Oral Suspension as one 3.75 gram packet once daily or one 1.875 gram packet twice daily. To prepare, empty the entire contents of one packet into a glass or cup. Add ½ to 1 cup (4 to 8 ounces) of water, fruit juice, or diet soft drinks. Stir well and drink. WELCHOL for Oral Suspension should be taken with meals. To avoid esophageal distress, WELCHOL for Oral Suspension should not be taken in its dry form. Always mix WELCHOL for Oral Suspension with water, fruit juice, or diet soft drinks before ingesting [See DOSAGE AND ADMINISTRATION].
Drugs with a known interaction with colesevelam (e.g., cyclosporine, glimepiride, glipizide, glyburide, levothyroxine, olmesartan medoxomil, oral contraceptives) should be administered at least 4 hours prior to WELCHOL. In an in vivo drug interaction study, there was no significant effect on the bioavailability of phenytoin; however, due to its narrow therapeutic index and post-marketing reports consistent with potential drug-drug interactions, phenytoin should be administered at least 4 hours prior to WELCHOL. Drugs that have not been tested for interaction with colesevelam, especially those with a narrow therapeutic index, should also be administered at least 4 hours prior to WELCHOL. Alternatively the physician should monitor blood levels of the coadministered drug. Patients receiving concomitant metformin ER and colesevelam should be monitored for clinical response as is usual for the use of anti-diabetes drugs [See DRUG INTERACTIONS].
WELCHOL can cause constipation. WELCHOL is contraindicated in patients with a history of bowel obstruction. WELCHOL is not recommended in patients who may be at risk of bowel obstruction, including patients with gastroparesis, other gastrointestinal motility disorders, or a history of major gastrointestinal surgery. Patients should be instructed to consume a diet that promotes bowel regularity. Patients should be instructed to promptly discontinue WELCHOL and seek medical attention if severe abdominal pain or severe constipation occurs. Because of the tablet size, WELCHOL Tablets can cause dysphagia or esophageal obstruction and should be used with caution in patients with dysphagia or swallowing disorders. To avoid esophageal distress, WELCHOL for Oral Suspension should not be taken in its dry form. Always mix WELCHOL for Oral Suspension with water, fruit juice, or diet soft drinks before ingesting [See WARNINGS AND PRECAUTIONS].
Patients should be instructed to discontinue WELCHOL and seek prompt medical attention if the hallmark symptoms of acute pancreatitis occur (e.g., severe abdominal pain with or without nausea and vomiting) [See WARNINGS AND PRECAUTIONS].
Patients should be advised to adhere to their National Cholesterol Education Program (NCEP)- recommended diet.
Patients should be advised that it is important to adhere to dietary instructions, a regular exercise program, and regular testing of blood glucose.
Patients should be informed that WELCHOL may increase serum triglyceride concentrations and that the long-term effect of hypertriglyceridemia on the risk of coronary artery disease is uncertain [See WARNINGS AND PRECAUTIONS].
