CLINICAL PHARMACOLOGY
Mechanism Of Action
Pitavastatin competitively
inhibits HMG-CoA reductase, which is a rate-determining enzyme involved with
biosynthesis of cholesterol, in a manner of competition with the substrate so
that it inhibits cholesterol synthesis in the liver. As a result, the
expression of LDL-receptors followed by the uptake of LDL from blood to liver
is accelerated and then the plasma TC decreases. Further, the sustained
inhibition of cholesterol synthesis in the liver decreases levels of very low
density lipoproteins.
Pharmacodynamics
In a randomized, double-blind,
placebo-controlled, 4-way parallel, active-comparator study with moxifloxacin
in 174 healthy participants, pitavastatin was not associated with clinically
meaningful prolongation of the QTc interval or heart rate at daily doses up to
16 mg (4 times the recommended maximum daily dose).
Pharmacokinetics
Absorption
Pitavastatin peak plasma concentrations are achieved
about 1 hour after oral administration. Both Cmax and AUC0-inf increased in an
approximately dose-proportional manner for single pitavastatin doses from 1 to
24 mg once daily. The absolute bioavailability of pitavastatin oral solution is
51%. Administration of pitavastatin with a high fat meal (50% fat content)
decreases pitavastatin Cmax by 43% but does not significantly reduce
pitavastatin AUC. The Cmax and AUC of pitavastatin did not differ following
evening or morning drug administration. In healthy volunteers receiving 4 mg
pitavastatin, the percent change from baseline for LDL-C following evening
dosing was slightly greater than that following morning dosing. Pitavastatin
was absorbed in the small intestine but very little in the colon.
Distribution
Pitavastatin is more than 99% protein bound in human
plasma, mainly to albumin and alpha 1-acid glycoprotein, and the mean volume of
distribution is approximately 148 L. Association of pitavastatin and/or its
metabolites with the blood cells is minimal.
Metabolism
Pitavastatin is marginally metabolized by CYP2C9 and to a
lesser extent by CYP2C8. The major metabolite in human plasma is the lactone
which is formed via an ester-type pitavastatin glucuronide conjugate by uridine
5'-diphosphate (UDP) glucuronosyltransferase (UGT1A3 and UGT2B7).
Excretion
A mean of 15% of radioactivity of orally administered,
single 32 mg 14C-labeled pitavastatin dose was excreted in urine,
whereas a mean of 79% of the dose was excreted in feces within 7 days. The mean
plasma elimination half-life is approximately 12 hours.
Race
In pharmacokinetic studies pitavastatin Cmax and AUC were
21 and 5% lower, respectively in Black or African American healthy volunteers
compared with those of Caucasian healthy volunteers. In pharmacokinetic
comparison between Caucasian volunteers and Japanese volunteers, there were no
significant differences in Cmax and AUC.
Gender
In a pharmacokinetic study which compared healthy male
and female volunteers, pitavastatin Cmax and AUC were 60 and 54% higher,
respectively in females. This had no effect on the efficacy or safety of
pitavastatin in women in clinical studies.
Geriatric
In a pharmacokinetic study which compared healthy young
and elderly (≥65 years) volunteers, pitavastatin Cmax and AUC were 10 and
30% higher, respectively, in the elderly. This had no effect on the efficacy or
safety of pitavastatin in elderly subjects in clinical studies.
Renal Impairment
In patients with moderate renal impairment (glomerular
filtration rate of 30 to 59 mL/min/ 1.73 m²) and end stage renal disease
receiving hemodialysis, pitavastatin AUC0-inf is 102 and 86% higher than those
of healthy volunteers, respectively, while pitavastatin Cmax is 60 and 40%
higher than those of healthy volunteers, respectively. Patients received hemodialysis
immediately before pitavastatin dosing and did not undergo hemodialysis during
the pharmacokinetic study. Hemodialysis patients have 33 and 36% increases in
the mean unbound fraction of pitavastatin as compared to healthy volunteers and
patients with moderate renal impairment, respectively.
In another pharmacokinetic study, patients with severe
renal impairment (glomerular filtration rate 15 to 29 mL/min/1.73 m²) not
receiving hemodialysis were administered a single dose of pitavastatin 4 mg.
The AUC0-inf and the Cmax were 36 and 18% higher, respectively, compared with
those of healthy volunteers. For both patients with severe renal impairment and
healthy volunteers, the mean percentage of protein-unbound pitavastatin was approximately
0.6%.
The effect of mild renal impairment on pitavastatin
exposure has not been studied.
Hepatic Impairment
The disposition of pitavastatin was compared in healthy
volunteers and patients with various degrees of hepatic impairment. The ratio of
pitavastatin Cmax between patients with moderate hepatic impairment (Child-Pugh
B disease) and healthy volunteers was 2.7. The ratio of pitavastatin AUCinf between
patients with moderate hepatic impairment and healthy volunteers was 3.8. The
ratio of pitavastatin Cmax between patients with mild hepatic impairment
(Child-Pugh A disease) and healthy volunteers was 1.3. The ratio of
pitavastatin AUCinf between patients with mild hepatic impairment and healthy
volunteers was 1.6. Mean pitavastatin t½ for moderate hepatic impairment, mild
hepatic impairment, and healthy were 15, 10, and 8 hours, respectively.
Drug-Drug Interactions
The principal route of pitavastatin metabolism is
glucuronidation via liver UGTs with subsequent formation of pitavastatin lactone.
There is only minimal metabolism by the cytochrome P450 system.
Warfarin
The steady-state pharmacodynamics (international
normalized ratio [INR] and prothrombin time [PT]) and pharmacokinetics of
warfarin in healthy volunteers were unaffected by the co-administration of
pitavastatin 4 mg daily. However, patients receiving warfarin should have their
PT time or INR monitored when NIKITA is added to their therapy.
Table 2: Effect of Co-Administered Drugs on Pitavastatin
Systemic Exposure
Co-administered drug |
Dose regimen |
Change in AUC* |
Change in C * vmax |
Cyclosporine |
Pitavastatin 2 mg QD for 6 days + cyclosporine 2 mg/kg on Day 6 |
↑ 4.6 fold† |
↑ 6.6 fold † |
Erythromycin |
Pitavastatin 4 mg single dose on Day 4 + erythromycin 500 mg 4 times daily for 6 days |
↑ 2.8 fold † |
↑ 3.6 fold † |
Rifampin |
Pitavastatin 4 mg QD + rifampin 600 mg QD for 5 days |
↑ 29% |
↑2.0 fold |
Atazanavir |
Pitavastatin 4 mg QD + atazanavir 300 mg daily for 5 days |
↑ 31% |
↑60% |
Darunavir/ Ritonavir |
Pitavastatin 4mg QD on Days 1-5 and 12-16 + darunavir/ritonavir 800mg/100 mg QD on Days 6-16 |
↓26% |
↓4% |
Lopinavir/ Ritonavir |
Pitavastatin 4 mg QD on Days 1-5 and 20-24 + lopinavir/ritonavir 400 mg/100 mg BID on Days 9 - 24 |
↓ 20% |
↓4 % |
Gemfibrozil |
Pitavastatin 4 mg QD + gemfibrozil 600 mg BID for 7 days |
↑ 45% |
↑ 31% |
Fenofibrate |
Pitavastatin 4 mg QD + fenofibrate 160 mg QD for 7 days |
↑18% |
↑ 11% |
Ezetimibe |
Pitavastatin 2 mg QD + ezetimibe 10 mg for 7 days |
↓ 2% |
↓0.2% |
Enalapril |
Pitavastatin 4 mg QD + enalapril 20 mg daily for 5 days |
↑6% |
↓ 7% |
Digoxin |
Pitavastatin 4 mg QD + digoxin 0.25 mg for 7 days |
↑ 4% |
↓ 9% |
Diltiazem LA |
Pitavastatin 4 mg QD on Days 1-5 and 11-15 and diltiazem LA 240 mg on Days 6-15 |
↑10% |
↑15% |
Grapefruit Juice |
Pitavastatin 2 mg single dose on Day 3 + grapefruit juice for 4 days |
↑ 15% |
↓ 12% |
Itraconazole |
Pitavastatin 4 mg single dose on Day 4 + itraconazole 200 mg daily for 5 days |
↓23% |
↓22% |
*Data presented as x-fold change represent the ratio
between co-administration and pitavastatin alone (i.e., 1-fold = no change).
Data presented as % change represent % difference relative to pitavastatin
alone (i.e., 0% = no change).
† Considered clinically significant [see DOSAGE AND ADMINISTRATION and DRUG
INTERACTIONS] BID = twice daily; QD = once daily; LA = Long Acting |
Table 3: Effect of Pitavastatin Co-Administration on
Systemic Exposure to Other Drugs
Co-administered drug |
Dose regimen |
Change in AUC* |
Change in Cmax* |
Atazanavir |
Pitavastatin 4 mg QD + atazanavir 300 mg daily for 5 days |
↑6% |
↑13% |
Darunavir |
Pitavastatin 4mg QD on Days 1-5 and 12-16 + darunavir/ritonavir 800mg/100 mg QD on Days 616 |
↑ 3% |
↑6% |
Lopinavir |
Pitavastatin 4 mg QD on Days 1-5 and 20-24 + lopinavir/ritonavir 400 mg/100 mg BID on Days 9 - 24 |
↓ 9% |
↓ 7% |
Ritonavir |
Pitavastatin 4 mg QD on Days 1-5 and 20-24 + lopinavir/ritonavir 400 mg/100 mg BID on Days 9 - 24 |
↓11% |
↓11% |
Ritonavir |
Pitavastatin 4mg QD on Days 1-5 and 12-16 + darunavir/ritonavir 800mg/100 mg QD on Days 616 |
↑ 8% |
↑2% |
Enalapril |
Pitavastatin 4 mg QD + enalapril 20 mg daily for 5 days |
Enalapril |
↑12% |
↑ 12% |
Enalaprilat |
↓ 1% |
↓ 1% |
Warfarin |
Individualized maintenance dose of warfarin (2 -7 mg) for 8 days + pitavastatin 4 mg QD for 9 days |
R-warfarin |
↑7% |
↑ 3% |
S-warfarin |
↑ 6% |
↑ 3% |
Ezetimibe |
Pitavastatin 2 mg QD + ezetimibe 10 mg for 7 days |
↑ 9% |
↑ 2% |
Digoxin |
Pitavastatin 4 mg QD + digoxin 0.25 mg for 7 days |
↓ 3% |
↓4% |
Diltiazem LA |
Pitavastatin 4 mg QD on Days 1-5 and 11-15 and diltiazem LA 240 mg on Days 6-15 |
↓2% |
↓7% |
Rifampin |
Pitavastatin 4 mg QD + rifampin 600 mg QD for 5 days |
↓15% |
↓18% |
* Data presented as % change
represent % difference relative to the investigated drug alone (i.e., 0% = no
change). BID = twice daily; QD = once daily; LA = Long Acting |
Animal Toxicology And/Or Pharmacology
Central Nervous System Toxicity
CNS vascular lesions, characterized by perivascular
hemorrhages, edema, and mononuclear cell infiltration of perivascular spaces,
have been observed in dogs treated with several other members of this drug
class. A chemically similar drug in this class produced dose-dependent optic
nerve degeneration (Wallerian degeneration of retinogeniculate fibers) in dogs,
at a dose that produced plasma drug levels about 30 times higher than the mean
drug level in humans taking the highest recommended dose. Wallerian degeneration
has not been observed with pitavastatin. Cataracts and lens opacities were seen
in dogs treated for 52 weeks at a dose level of 1 mg/kg/day (9 times clinical
exposure at the maximum human dose of 4 mg/day based on AUC comparisons).
Clinical Studies
Primary Hyperlipidemia Or Mixed Dyslipidemia
Dose-ranging study
A multicenter, randomized, double-blind,
placebo-controlled, dose-ranging study was performed to evaluate the efficacy
of pitavastatin compared with placebo in 251 patients with primary
hyperlipidemia (Table 4). Pitavastatin given as a single daily dose for 12
weeks significantly reduced plasma LDL-C, TC, TG, and Apo-B compared to placebo
and was associated with variable increases in HDL-C across the dose range.
Table 4: Dose-Response in Patients with Primary
Hypercholesterolemia (Adjusted Mean % Change from Baseline at Week 12)
Treatment |
N |
LDL-C |
Apo-B |
TC |
TG |
HDL-C |
Placebo |
53 |
-3 |
-2 |
-2 |
1 |
0 |
Pitavastatin 1mg |
52 |
-32 |
-25 |
-23 |
-15 |
8 |
Pitavastatin 2mg |
49 |
-36 |
-30 |
-26 |
-19 |
7 |
Pitavastatin 4mg |
51# |
-43 |
-35 |
-31 |
-18 |
5 |
#The number of subjects for Apo-B was 49 |
Active-Controlled Study With
Atorvastatin (NK-104-301)
Pitavastatin was compared with
the HMG-CoA reductase inhibitor atorvastatin in a randomized, multicenter,
double-blind, double-dummy, active-controlled, non-inferiority Phase 3 study of
817 patients with primary hyperlipidemia or mixed dyslipidemia. Patients
entered a 6- to 8-week wash-out/dietary lead-in period and then were randomized
to a 12-week treatment with either pitavastatin or atorvastatin (Table 5).
Non-inferiority of pitavastatin to a given dose of atorvastatin was considered
to be demonstrated if the lower bound of the 95% CI for the mean treatment
difference was greater than -6% for the mean percent change in LDL-C.
Lipid results are shown in
Table 5. For the percent change from baseline to endpoint in LDL-C,
pitavastatin was non-inferior to atorvastatin for the two pairwise comparisons:
pitavastatin 2 mg vs. atorvastatin 10 mg and pitavastatin 4 mg vs. atorvastatin
20 mg. Mean treatment differences (95% CI) were 0% (-3%, 3%) and 1% (-2%, 4%),
respectively.
Table 5: Response by Dose of
Pitavastatin and Atorvastatin in Patients with Primary Hyperlipidemia or Mixed
Dyslipidemia (Mean % Change from Baseline at Week 12)
Treatment |
N |
LDL-C |
Apo-B |
TC |
TG |
HDL-C |
non-HDL-C |
Pitavastatin 2 mg daily |
315 |
-38 |
-30 |
-28 |
-14 |
4 |
-35 |
Pitavastatin 4 mg daily |
298 |
-45 |
-35 |
-32 |
-19 |
5 |
-41 |
Atorvastatin 10 mg daily |
102 |
-38 |
-29 |
-28 |
-18 |
3 |
-35 |
Atorvastatin 20 mg daily |
102 |
-44 |
-36 |
-33 |
-22 |
2 |
-41 |
Atorvastatin 40 mg daily |
..........................Not Studied.......................... |
Atorvastatin 80 mg daily |
..........................Not Studied.......................... |
Active-Controlled Study With
Simvastatin (NK-104-302)
Pitavastatin was compared with
the HMG-CoA reductase inhibitor simvastatin in a randomized, multicenter,
double-blind, double-dummy, active-controlled, non-inferiority Phase 3 study of
843 patients with primary hyperlipidemia or mixed dyslipidemia. Patients
entered a 6- to 8-week wash-out/dietary lead-in period and then were randomized
to a 12 week treatment with either pitavastatin or simvastatin (Table 6).
Non-inferiority of pitavastatin to a given dose of simvastatin was considered
to be demonstrated if the lower bound of the 95% CI for the mean treatment
difference was greater than -6% for the mean percent change in LDL-C.
Lipid results are shown in
Table 6. For the percent change from baseline to endpoint in LDL-C,
pitavastatin was non-inferior to simvastatin for the two pairwise comparisons:
pitavastatin 2 mg vs. simvastatin 20 mg and pitavastatin 4 mg vs. simvastatin
40 mg. Mean treatment differences (95% CI) were 4% (1%, 7%) and 1% (-2%, 4%),
respectively.
Table 6: Response by Dose of
Pitavastatin and Simvastatin in Patients with Primary Hyperlipidemia or Mixed
Dyslipidemia (Mean % Change from Baseline at Week 12)
Treatment |
N |
LDL-C |
Apo-B |
TC |
TG |
HDL-C |
non-HDL-C |
Pitavastatin 2 mg daily |
307 |
-39 |
-30 |
-28 |
-16 |
6 |
-36 |
Pitavastatin 4 mg daily |
319 |
-44 |
-35 |
-32 |
-17 |
6 |
-41 |
Simvastatin 20 mg daily |
107 |
-35 |
-27 |
-25 |
-16 |
6 |
-32 |
Simvastatin 40 mg daily |
110 |
-43 |
-34 |
-31 |
-16 |
7 |
-39 |
Simvastatin 80 mg daily |
..........................Not Studied--........................ |
Active-Controlled Study With
Pravastatin In Elderly (NK-104-306)
Pitavastatin was compared with
the HMG-CoA reductase inhibitor pravastatin in a randomized, multicenter,
double-blind, double-dummy, parallel group, active-controlled non-inferiority
Phase 3 study of 942 elderly patients (≥65 years) with primary hyperlipidemia
or mixed dyslipidemia. Patients entered a 6-to 8-week wash-out/dietary lead-in
period, and then were randomized to a once daily dose of pitavastatin or
pravastatin for 12 weeks (Table 7). Non-inferiority of pitavastatin to a given
dose of pravastatin was assumed if the lower bound of the 95% CI for the
treatment difference was greater than -6% for the mean percent change in LDL-C.
Lipid results are shown in
Table 7. Pitavastatin significantly reduced LDL-C compared to pravastatin as
demonstrated by the following pairwise dose comparisons: Pitavastatin 1 mg vs.
pravastatin 10 mg, pitavastatin 2 mg vs. pravastatin 20 mg and pitavastatin 4
mg vs. pravastatin 40 mg. Mean treatment differences (95% CI) were 9% (6%,
12%), 10% (7%, 13%) and 10% (7%, 13% ), respectively.
Table 7: Response by Dose of
Pitavastatin and Pravastatin in Patients with Primary Hyperlipidemia or Mixed
Dyslipidemia (Mean % Change from Baseline at Week 12)
Treatment |
N |
LDL-C |
Apo-B |
TC |
TG |
HDL-C |
non-HDL-C |
Pitavastatin 1 mg daily |
207 |
-31 |
-25 |
-22 |
-13 |
1 |
-29 |
Pitavastatin 2 mg daily |
224 |
-39 |
-31 |
-27 |
-15 |
2 |
-36 |
Pitavastatin 4 mg daily |
210 |
-44 |
-37 |
-31 |
-22 |
4 |
-41 |
Pravastatin 10 mg daily |
103 |
-22 |
-17 |
-15 |
-5 |
0 |
-20 |
Pravastatin 20 mg daily |
96 |
-29 |
-22 |
-21 |
-11 |
-1 |
-27 |
Pravastatin 40 mg daily |
102 |
-34 |
-28 |
-24 |
-15 |
1 |
-32 |
Pravastatin 80 mg daily |
.........................-Not Studied.......................... |
Active-Controlled Study With
Simvastatin In Patients With ≥ 2 Risk Factors For Coronary Heart Disease (NK-104-304)
Pitavastatin was compared with
the HMG-CoA reductase inhibitor simvastatin in a randomized, multicenter,
double-blind, double-dummy, active-controlled, non-inferiority Phase 3 study of
351 patients with primary hyperlipidemia or mixed dyslipidemia with ≥2
risk factors for coronary heart disease. After a 6-to 8-week wash-out/dietary
lead-in period, patients were randomized to a 12-week treatment with either
pitavastatin or simvastatin (Table 8). Non-inferiority of pitavastatin to
simvastatin was considered to be demonstrated if the lower bound of the 95% CI
for the mean treatment difference was greater than -6% for the mean percent
change in LDL-C.
Lipid results are shown in
Table 8. Pitavastatin 4 mg was non-inferior to simvastatin 40 mg for percent
change from baseline to endpoint in LDL-C. The mean treatment difference (95%
CI) was 0% (-2%, 3%).
Table 8: Response by Dose of
Pitavastatin and Simvastatin in Patients with Primary Hyperlipidemia or Mixed
Dyslipidemia with ≥2 Risk Factors for Coronary Heart Disease (Mean %
Change from Baseline at Week 12)
Treatment |
N |
LDL-C |
Apo-B |
TC |
TG |
HDL-C |
non-HDL-C |
Pitavastatin 4 mg daily |
233 |
-44 |
-34 |
-31 |
-20 |
7 |
-40 |
Simvastatin 40 mg daily |
118 |
-44 |
-34 |
-31 |
-15 |
5 |
-39 |
Simvastatin 80 mg daily |
..........................Not Studied.......................... |
Active-Controlled Study With
Atorvastatin In Patients With Type II Diabetes Mellitus (NK-104-305)
Pitavastatin was compared with
the HMG-CoA reductase inhibitor atorvastatin in a randomized, multicenter, double-blind,
double-dummy, parallel group, active-controlled, non-inferiority Phase 3 study
of 410 subjects with type II diabetes mellitus and combined dyslipidemia.
Patients entered a 6- to 8-week wash-out/dietary lead-in period and were
randomized to a once daily dose of pitavastatin or atorvastatin for 12 weeks.
Non-inferiority of pitavastatin was considered to be demonstrated if the lower
bound of the 95% CI for the mean treatment difference was greater than -6% for
the mean percent change in LDL-C.
Lipid results are shown in
Table 9. The treatment difference (95% CI) for LDL-C percent change from
baseline was -2% (-6.2%, 1.5%). The two treatment groups were not statistically
different on LDL-C. However, the lower limit of the CI was -6.2%, slightly exceeding
the -6% non-inferiority limit so that the non-inferiority objective was not
achieved.
Table 9: Response by Dose of
Pitavastatin and Atorvastatin in Patients with Type II Diabetes Mellitus and
Combined Dyslipidemia (Mean % Change from Baseline at Week 12)
Treatment |
N |
LDL-C |
Apo-B |
TC |
TG |
HDL-C |
non-HDL-C |
Pitavastatin 4 mg daily |
274 |
-41 |
-32 |
-28 |
-20 |
7 |
-36 |
Atorvastatin 20 mg daily |
136 |
-43 |
-34 |
-32 |
-27 |
8 |
-40 |
Atorvastatin 40 mg daily |
.........................-Not Studied.......................... |
Atorvastatin 80 mg daily |
.........................-Not Studied.......................... |
The treatment differences in efficacy in LDL-C change from
baseline between pitavastatin and active controls in the Phase 3 studies are
summarized in Figure 1.
Figure 1: Treatment
Difference in Adjusted Mean Percent Change in LDL-C
NL=non-inferiority limit.