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Effects of Orlistat, a Lipase Inhibitor, on the Pharmacokinetics of Three Highly Lipophilic Drugs (Amiodarone, Fluoxetine, and Simvastatin) in Healthy Volunteers

From Hoffmann-La Roche, Inc., Nutley, New Jersey.

To investigate the effect of orlistat on the pharmacokinetics of three highly lipophilic drugs (amiodarone, fluoxetine, and simvastatin), the authors performed double-blind, placebo-controlled, randomized two-period crossover (for fluoxetine and simvastatin) or parallel (for amiodarone) studies in healthy volunteers ages 18 to 65 years of a body mass index between 18 and 30 kg/m². During treatment with orlistat or matching placebo for 5 to 13 days, a single oral dose of highly lipophilic drug was administered, followed by obtaining serial blood samples for measuring plasma (for fluoxetine and simvastatin) or serum (for amiodarone) concentrations of the lipophilic drug and its active metabolite. Treatments were compared for the pharmacokinetic parameters AUC_0-, C_max,t_max, and t_1/2 of highly lipophilic drugs and active metabolites. Analysis of variance was performed to assess the significance of the sequence effect and provide the variance estimate for the 90% confidence intervals. Subjects were also evaluated for adverse events, vital signs, and clinical and laboratory safety. The absorption of amiodarone (and active metabolite) was significantly reduced by approximately one-quarter using parameters of C_max and AUC, while no inhibition of absorption was observed for fluoxetine and simvastatin as well as their active metabolites. There were no clinically significant differences in t_1/2 and t_max for all three drugs tested. Due to expected gastrointestinal adverse events known to occur with orlistat, there was a higher incidence of adverse events under regimen B (highly lipophilic drugs and orlistat) than under regimen A (highly lipophilic drugs and placebo). Other adverse events were sporadic and unremarkable. There were no clinically relevant changes in vital signs or laboratory values. In conclusion, except for amiodarone, there was no effect of orlistat on the pharmacokinetics of highly lipophilic drugs when these drugs were taken concomitantly with orlistat.

Key Words: Orlistat • obesity • miodarone • fluoxetine • simvastatin • ipophilic drugs

Address for reprints: J. Zhi, PhD, FCP, ABCP, Department of Clinical Pharmacology, Hoffmann-La Roche, Inc., 340 Kingsland Street, Nutley, NJ 07110-1199.

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