Precautions for Soriatane
A description of the Do Your P.A.R.T. materials is provided below. The main goals of the materials are to explain the program requirements, to reinforce the educational messages, and to assess program effectiveness.
The Do Your P.A.R.T. booklet includes:
- The Do Your P.A.R.T. Patient Brochure: information on the program requirements, risks of acitretin, and the types of contraceptive methods
- The Patient Agreement/Informed Consent for Female Patients form
- Medication Guide
Do Your P.A.R.T. Program materials are available at www.soriatane.com or may be requested by calling 1-888-784-3335 (1-888-STIEFEL).
Information For Patients
(See Medication Guide for all patients and Patient Agreement/Informed Consent for Female Patients at end of professional labeling).
Patients should be instructed to read the Medication Guide supplied as required by law when SORIATANE is dispensed.
Females Of Reproductive Potential
SORIATANE can cause severe birth defects. Female patients must not be pregnant when therapy with SORIATANE is initiated, they must not become pregnant while taking SORIATANE and for at least 3 years after stopping SORIATANE, so that the drug can be eliminated to below a blood concentration that would be associated with an increased incidence of birth defects. Because this threshold has not been established for acitretin in humans and because elimination rates vary among patients, the duration of posttherapy contraception to achieve adequate elimination cannot be calculated precisely (see BOXED CONTRAINDICATIONS AND WARNINGS).
Females of reproductive potential should also be advised that they must not ingest beverages or products containing ethanol while taking SORIATANE and for 2 months after SORIATANE has been discontinued. This allows for elimination of the acitretin which can be converted to etretinate in the presence of alcohol.
Female patients should be advised that any method of birth control can fail, including tubal ligation, and that microdosed progestin “minipill” preparations are not recommended for use with SORIATANE (see CLINICAL PHARMACOLOGY: Pharmacokinetic Drug Interactions). Data from one patient who received a very low-dosed progestin contraceptive (levonorgestrel 0.03 mg) had a significant increase of the progesterone level after 3 menstrual cycles during acitretin treatment.2
Female patients should be advised to contact their physician, women’s health centers, pharmacies, or hospital emergency rooms for information about how to obtain Emergency Contraception if sexual intercourse occurs without using 2 effective forms of contraception simultaneously. A 24-hour, toll-free number (1-800-739-6700) is also available for patients to receive automated birth control and emergency contraception information.
Female patients should sign a consent form prior to beginning therapy with SORIATANE (see boxed CONTRAINDICATIONS AND WARNINGS).
Nursing Mothers
Studies on lactating rats have shown that etretinate is excreted in the milk. There is one prospective case report where acitretin is reported to be excreted in human milk. Therefore, nursing mothers should not receive SORIATANE prior to or during nursing because of the potential for serious adverse reactions in nursing infants.
All Patients
Depression and/or other psychiatric symptoms such as aggressive feelings or thoughts of self-harm have been reported. These events, including self-injurious behavior, have been reported in patients taking other systemically administered retinoids, as well as in patients taking SORIATANE. Since other factors may have contributed to these events, it is not known if they are related to SORIATANE. Patients should be counseled to stop taking SORIATANE and notify their prescriber immediately if they experience psychiatric symptoms.
Patients should be advised that a transient worsening of psoriasis is sometimes seen during the initial treatment period. Patients should be advised that they may have to wait 2 to 3 months before they get the full benefit of SORIATANE, although some patients may achieve significant improvements within the first 8 weeks of treatment as demonstrated in clinical trials.
Decreased night vision has been reported during therapy with SORIATANE. Patients should be advised of this potential problem and warned to be cautious when driving or operating any vehicle at night. Visual problems should be carefully monitored (see WARNINGS and ADVERSE REACTIONS). Patients should be advised that they may experience decreased tolerance to contact lenses during the treatment period and sometimes after treatment has stopped.
Patients should not donate blood during and for at least 3 years following therapy because SORIATANE can cause birth defects and women of childbearing potential must not receive blood from patients being treated with SORIATANE.
Because of the relationship of SORIATANE to vitamin A, patients should be advised against taking vitamin A supplements in excess of minimum recommended daily allowances to avoid possible additive toxic effects.
Patients should avoid the use of sun lamps and excessive exposure to sunlight (non-medical UV exposure) because the effects of UV light are enhanced by retinoids.
Patients should be advised that they must not give their SORIATANE to any other person.
For Prescribers
SORIATANE has not been studied in and is not indicated for treatment of acne.
Phototherapy
Significantly lower doses of phototherapy are required when SORIATANE is used because effects on the stratum corneum induced by SORIATANE can increase the risk of erythema (burning) (see DOSAGE AND ADMINISTRATION).
Drug Interactions
Ethanol
Clinical evidence has shown that etretinate can be formed with concurrent ingestion of acitretin and ethanol (see BOXED CONTRAINDICATIONS AND WARNINGS and CLINICAL PHARMACOLOGY: Pharmacokinetics).
Glyburide
In a trial of 7 healthy male volunteers, acitretin treatment potentiated the blood glucose-lowering effect of glyburide (a sulfonylurea similar to chlorpropamide) in 3 of the 7 subjects. Repeating the trial with 6 healthy male volunteers in the absence of glyburide did not detect an effect of acitretin on glucose tolerance. Careful supervision of diabetic patients under treatment with SORIATANE is recommended (see CLINICAL PHARMACOLOGY: Pharmacokinetics and DOSAGE AND ADMINISTRATION).
Hormonal Contraceptives
It has not been established if there is a pharmacokinetic interaction between acitretin and combined oral contraceptives. However, it has been established that acitretin interferes with the contraceptive effect of microdosed progestin “minipill” preparations. Microdosed “minipill” progestin preparations are not recommended for use with SORIATANE (see CLINICAL PHARMACOLOGY: Pharmacokinetic Drug Interactions). It is not known whether other progestin-only contraceptives, such as implants and injectables, are adequate methods of contraception during acitretin therapy.
Methotrexate
An increased risk of hepatitis has been reported to result from combined use of methotrexate and etretinate. Consequently, the combination of methotrexate with acitretin is also contraindicated (see CONTRAINDICATIONS).
Phenytoin
If acitretin is given concurrently with phenytoin, the protein binding of phenytoin may be reduced.
Tetracyclines
Since both acitretin and tetracyclines can cause increased intracranial pressure, their combined use is contraindicated (see CONTRAINDICATIONS and WARNINGS: Pseudotumor Cerebri).
Vitamin A And Oral Retinoids
Concomitant administration of vitamin A and/or other oral retinoids with acitretin must be avoided because of the risk of hypervitaminosis A.
Other
There appears to be no pharmacokinetic interaction between acitretin and cimetidine, digoxin, or glyburide. Investigations into the effect of acitretin on the protein binding of anticoagulants of the coumarin type (warfarin) revealed no interaction.
Laboratory Tests
If significant abnormal laboratory results are obtained, either dosage reduction with careful monitoring or treatment discontinuation is recommended, depending on clinical judgment.
Blood Sugar
Some patients receiving retinoids have experienced problems with blood sugar control. In addition, new cases of diabetes have been diagnosed during retinoid therapy, including diabetic ketoacidosis. In diabetics, blood-sugar levels should be monitored very carefully.
Lipids
In clinical trials, the incidence of hypertriglyceridemia was 66%, hypercholesterolemia was 33%, and that of decreased HDL was 40%. Pretreatment and follow-up measurements should be obtained under fasting conditions. It is recommended that these tests be performed weekly or every other week until the lipid response to SORIATANE has stabilized (see WARNINGS).
Liver Function Tests
Elevations of AST (SGOT), ALT (SGPT), or LDH were experienced by approximately 1 in 3 patients treated with SORIATANE. It is recommended that these tests be performed prior to initiation of therapy with SORIATANE, at 1- to 2-week intervals until stable, and thereafter at intervals as clinically indicated (see CONTRAINDICATIONS and BOXED WARNINGS).
Carcinogenesis, Mutagenesis, Impairment Of Fertility
Carcinogenesis
A carcinogenesis study of acitretin in Wistar rats, at doses up to 2 mg per kg per day administered 7 days per week for 104 weeks, has been completed. There were no neoplastic lesions observed that were considered to have been related to treatment with acitretin. An 80-week carcinogenesis study in mice has been completed with etretinate, the ethyl ester of acitretin. Blood level data obtained during this study demonstrated that etretinate was metabolized to acitretin and that blood levels of acitretin exceeded those of etretinate at all times studied. In the etretinate study, an increased incidence of blood vessel tumors (hemangiomas and hemangiosarcomas at several different sites) was noted in male, but not female, mice at doses approximately one-half the maximum recommended human therapeutic dose based on a mg-per-m² comparison.
Mutagenesis
Acitretin was evaluated for mutagenic potential in the Ames test, in the Chinese hamster (V79/HGPRT) assay, in unscheduled DNA synthesis assays using rat hepatocytes and human fibroblasts, and in an in vivo mouse micronucleus assay. No evidence of mutagenicity of acitretin was demonstrated in any of these assays.
Impairment Of Fertility
In a fertility study in rats, the fertility of treated animals was not impaired at the highest dosage of acitretin tested, 3 mg per kg per day (approximately one-half the maximum recommended therapeutic dose based on a mg-per-m² comparison). Chronic toxicity studies in dogs revealed testicular changes (reversible mild to moderate spermatogenic arrest and appearance of multinucleated giant cells) in the highest dosage group (50 then 30 mg per kg per day).
No decreases in sperm count or concentration and no changes in sperm motility or morphology were noted in 31 men (17 psoriatic subjects, 8 subjects with disorders of keratinization, and 6 healthy volunteers) given 30 to 50 mg per day of acitretin for at least 12 weeks. In these trials, no deleterious effects were seen on either testosterone production, LH, or FSH in any of the 31 men.4-6 No deleterious effects were seen on the hypothalamic-pituitary axis in any of the 18 men where it was measured.4,5
Pregnancy
Teratogenic Effects
(see BOXED CONTRAINDICATIONS AND WARNINGS).
In a study in which acitretin was administered to male rats only at a dosage of 5 mg per kg per day for 10 weeks (approximate duration of one spermatogenic cycle) prior to and during mating with untreated female rats, no teratogenic effects were observed in the progeny (see BOXED CONTRAINDICATIONS AND WARNINGS for information about male use of SORIATANE).
Nonteratogenic Effects
In rats dosed at 3 mg per kg per day (approximately one-half the maximum recommended therapeutic dose based on a mg-per-m² comparison), slightly decreased pup survival and delayed incisor eruption were noted. At the next lowest dose tested, 1 mg per kg per day, no treatment-related adverse effects were observed.
Pediatric Use
Safety and effectiveness in pediatric patients have not been established. No clinical trials have been conducted in pediatric subjects. Ossification of interosseous ligaments and tendons of the extremities, skeletal hyperostoses, decreases in bone mineral density, and premature epiphyseal closure have been reported in children taking other systemic retinoids, including etretinate, a metabolite of SORIATANE. A causal relationship between these effects and SORIATANE has not been established. While it is not known that these occurrences are more severe or more frequent in children, there is special concern in pediatric patients because of the implications for growth potential (see WARNINGS: Hyperostosis).
Geriatric Use
Clinical trials of SORIATANE did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently than younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger subjects. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy. A 2-fold increase in acitretin plasma concentrations was seen in healthy elderly subjects compared with young subjects, although the elimination half-life did not change (see CLINICAL PHARMACOLOGY: Special Populations).
REFERENCES
4. Sigg C, et al.: Andrological investigations in patients treated with etretin. Dermatologica 175:48-49, 1987.
5. Parsch EM, et al.: Andrological investigation in men treated with acitretin (Ro 10-1670). Andrologia 22:479-482, 1990.
6. Kadar L, et al.: Spermatological investigations in psoriatic patients treated with acitretin. In: Pharmacology of Retinoids in the Skin; Reichert U. et al., ed, KARGER, Basel, vol. 3, pp 253-254, 1988.