Multiple-dose pharmacokinetics of ritonavir in human immunodeficiency virus-infected subjects
| Autor: | John M. Leonard, Niu P, G R Granneman, Jon F. Denissen, Akhteruzzaman Molla, G Witt, J Smith, Ann Hsu, N. Lyons, J. Girault, J P Decourt, J B Fourtillan, J Valdes, Keith Erdman, Charles Locke |
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| Rok vydání: | 1997 |
| Předmět: |
Adult
Male medicine.medical_specialty Population Cmax HIV Infections Biology Pharmacokinetics Elimination rate constant Double-Blind Method Oral administration Internal medicine Blood plasma medicine Humans Pharmacology (medical) education Morning Pharmacology education.field_of_study Ritonavir Dose-Response Relationship Drug Blood Proteins HIV Protease Inhibitors Middle Aged Infectious Diseases Endocrinology Area Under Curve Immunology medicine.drug Research Article |
| Zdroj: | Antimicrobial agents and chemotherapy. 41(5) |
| ISSN: | 0066-4804 |
| Popis: | The multiple-dose pharmacokinetics of ritonavir were investigated in four groups of human immunodeficiency virus-positive male subjects (with 16 subjects per group) under nonfasting conditions; a 3:1 ritonavir:placebo ratio was used. Ritonavir was given at 200 (group I), 300 (group II), 400 (group III), or 500 (group IV) mg every 12 h for 2 weeks. The multiple-dose pharmacokinetics of ritonavir were moderately dose dependent, with the clearance for group IV (6.8 +/- 2.7 liters/h) being an average of 32% lower than that for group I (10.0 +/- 3.2 liters/h). First-pass metabolism should be minimal for ritonavir. The functional half-life, estimated from peak and trough concentrations, were similar among the dosage groups, averaging 3.1 and 5.7 h after the morning and evening doses, respectively. The area under the concentration-time curve at 24 h (AUC24) and apparent terminal-phase elimination rate constant remained relatively time invariant, but predose concentrations decreased 30 to 70% over time. Concentration-dependent autoinduction is the most likely mechanism for the time-dependent pharmacokinetics. The Km and initial maximum rate of metabolism (Vmax) values estimated from population pharmacokinetic modeling (nonlinear mixed-effects models) were 3.43 microg/ml and 46.9 mg/h, respectively. The group IV Vmax increased to 68 mg/h after 2 weeks. The maximum concentration of ritonavir in serum (Cmax) and AUC after the evening doses were an average of 30 to 40% lower than the values after the morning doses, while the concentration at 12 h was an average of 32% lower than the predose concentration, probably due to protracted absorption. Less than 2% of the dose was eliminated unchanged in the urine. Triglyceride levels increased from the levels at the baseline, and the levels were correlated with baseline triglyceride levels and AUC, Cmax, or predose concentrations. |
| Databáze: | OpenAIRE |
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