Pharmacokinetics of lovastatin extended-release dosage form (Lovastatin XL) in healthy volunteers.

The purpose of this study was to evaluate pharmacokinetics and dose proportionality of lovastatin extended-release dosage form (ER-lovastatin) in the dosage levels of 10, 20 and 40 mg in 9 healthy male subjects. Each subject was randomized to receive a single oral dose of ER-lovastatin either 10, 20 or 40 mg in a three-way crossover design with a washout period of 7 days between the treatments. Subjects were served dinner at approximately 5:30 PM followed by dosing at approximately 10:00 PM in each study period. Serial plasma samples were collected up to 48 h after dosing and assayed for lovastatin and its active metabolite lovastatin acid using an LC/MS/MS method. The plasma concentration-time profiles of lovastatin and its active metabolite lovastatin acid exhibited delayed- and extended-release characteristics at each dose. Mean (+/-) values for the C(max) of lovastatin were 1.04+/-0.43, 2.03+/-0.65 and 4.03+/-3.02 ng/ml for the 10, 20 and 40 mg dosage, respectively. The corresponding values for the AUC(0-48 h) of lovastatin were 14.6+/-7.8, 34.1 +/-13.7, and 53.9+/-35.6 ng h/ml. The same tendency was also found for C(max) and AUC(0-48 h) values of lovastatin acid. Results from this study demonstrated as the dose of ER-lovastatin increased from 10 to 40 mg, the C(max) and AUC(0-48 h) values of lovastatin as well as lovastatin acid appeared to increase linearly.

A multiple-dose pharmacodynamic, safety, and pharmacokinetic comparison of extended- and immediate-release formulations of lovastatin.

BACKGROUND: Because lovastatin is efficiently extracted by the liver and because its administration in divided doses is associated with increased efficacy, an extended-release (ER) formulation may have the potential for a dose-sparing advantage relative to the immediate-release (IR) formulation in the treatment of hypercholesterolemia. OBJECTIVE: This study compared the short-term pharmacodynamics, safety, and pharmacokinetics of multiple doses of lovastatin ER with those of lovastatin IR in patients with fasting low-density lipoprotein cholesterol (LDL-C) levels between 130 and 250 mg/dL and fasting triglyceride levels < 350 mg/dL. METHODS: The study had a randomized, single-blind, positive-controlled, 2-way crossover design, with a 4-week diet/placebo run-in period and two 4-week active-treatment periods. During period 1, patients received either lovastatin ER or lovastatin IR (both 40 mg OD). After 4 weeks of the initial study treatment and a 2-week washout period, patients were switched to the alternate treatment (period 2). Pharmacodynamic parameters (LDL-C, high-density lipoprotein cholesterol, total cholesterol, and triglyceride levels) were evaluated by combining data from weeks 3 and 4 of treatment. In a pharmacokinetic substudy, maximum plasma concentrations (C(max)) and area under the plasma concentration-time curve from zero to 24 hours (AUC(024)) were determined for lovastatin, lovastatin acid, and total and active inhibitors of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase on days 1 and 28 of active treatment. The geometric mean ratio of AUC(0-24) (lovastatin ER/lovastatin IR) was also calculated for each of these substances. RESULTS: Of 76 patients who entered the run-in period, 26 (12 men, 14 women; mean age, 56.2 years) were randomized to receive active treatment and 24 were included in the efficacy analysis; 13 patients were included in the pharmacokinetic substudy, 12 of whom had complete pharmacokinetic data. Compared with lovastatin IR, lovastatin ER produced a 3.9% greater reduction in LDL-C (P = 0.044). Changes in other lipid parameters were not statistically significant. In the pharmacokinetic substudy, C(max) values for lovastatin, lovastatin acid, and in hibitors of HMG-CoA reductase were lower at day 28 with lovastatin ER than with lovastatin IR. The AUC(0-24) ratio for lovastatin was 1.91 (90% CI, 1.77 - 3.35), reflecting higher bioavailability of the prodrug with lovastatin ER; in contrast, the ratios for lovastatin acid and active and total inhibitors of HMG-CoA reductase were < 1. CONCLUSIONS: In this short-term study in a small number of patients, lovastatin ER 40 mg produced significantly greater LDL-C lowering than did an equal dose of lovastatin IR, with a relatively low C(max) and comparable systemic exposure to lovastatin acid and active and total inhibitors of HMG-CoA reductase. Lovastatin ER was well tolerated, with no discontinuations due to adverse events.

Comparative pharmacokinetics of lovastatin extended-release tablets and lovastatin immediate-release tablets in humans.

The pharmacokinetics of lovastatin and its active metabolite lovastatin acid was evaluated in 9 healthy subjects in a three-period crossover study following a single oral dose of lovastatin extended-release (ER) tablets and lovastatin immediate-release (IR) tablets. Participants were dosed with lovastatin IR 40 mg tablets following a standard breakfast, lovastatin ER 40 mg tablets following a standard breakfast, and lovastatin ER 40 mg tablets underfasting conditions. Serial plasma samples were collected for up to 48 hours postdose and assayed for lovastatin and lovastatin acid using a liquid chromatography/mass spectroscopy/mass spectroscopy method. Lovastatin ER tablets, unlike lovastatin IR tablets, exhibited delayed- and extended-release characteristics. The relative bioavailability, in terms of area under the curve values, of lovastatin (156%) and lovastatin acid (124%) was greater from lovastatin ER tablets as compared with lovastatin IR tablets when given with breakfast. An even greater increase in the bioavailability of lovastatin (261%) and lovastatin acid (231%) was observed when the lovastatin ER tablets were administered under fasting conditions. Thus, greater gastrointestinal tract drug absorption of lovastatin from lovastatin ER tablets was demonstrated. Ingestion of a standard breakfast prior to administration of lovastatin ER tablets decreased absorption of lovastatin by approximately 40%, relative to lovastatin ER tablets under fasting conditions.