A retrospective, cohort-based survey of patients using twice-daily indinavir + ritonavir combinations: pharmacokinetics, safety, and efficacy.
Publication year
2001Source
Journal of Acquired Immune Deficiency Syndromes and Human Retrovirology, 26, 3, (2001), pp. 218--24ISSN
Publication type
Article / Letter to editor

Display more detailsDisplay less details
Organization
Clinical Pharmacy
Internal Medicine
Journal title
Journal of Acquired Immune Deficiency Syndromes and Human Retrovirology
Volume
vol. 26
Issue
iss. 3
Page start
p. 218-
Page end
p. 24
Subject
The role of cytokines in the pathophysiology of febrile illnesses and in host defense against infections; Rational Use of Drugs and Pharmaco-epidemiology; De rol van cytokinen in de pathofysiologie van koortsende ziekten en in de afweer tegen infecties; Rationeel Geneesmiddelengebruik en Farmaco-epidemiologieAbstract
OBJECTIVE: To describe the pharmacokinetics, safety, and efficacy of twice-daily indinavir + ritonavir regimens DESIGN: A cohort-based survey of HIV-infected patients who either used indinavir 800 mg + ritonavir 100 mg twice daily or indinavir 400 mg + ritonavir 400 mg twice daily. METHODS: Data were extracted from a database of samples sent to our laboratory for measurement of indinavir + ritonavir plasma concentrations. Patient characteristics, safety, and efficacy measurements were collected by retrospective chart review. RESULTS: 100 Patients using 800-mg indinavir + 100-mg ritonavir twice daily and 32 patients using 400-mg indinavir + 400-mg ritonavir twice daily were eligible. Median peak and trough concentrations of indinavir were 6.8 and 0.77 mg/L in the 800/100 group and 2.6 and 0.45 mg/L in the 400/400 group. The most frequently found side effects were nausea and vomiting, which occurred in 22.1% and 34.9% of the patients in the 800/100 and the 400/400 groups, respectively. Viral load data were analyzed for patients who switched from 800-mg indinavir three times daily to one of the indinavir + ritonavir twice daily regimens. At the time of switch 63% (800/100 group) and 60% (400/400 group) had an undetectable viral load and this increased to 77% and 70%, respectively, during follow-up. Patients who switched to the 400/400 group discontinued treatment more frequently than patients who switched to the 800/100 group (70% vs. 26%, p =.008). CONCLUSIONS: Indinavir + ritonavir regimens show improved pharmacokinetic properties, allowing twice-daily dosing with food. Clinical data suggest that safety and efficacy is at least as good as with indinavir three-times-daily regimens without ritonavir. Prospective, comparative trials are needed to properly assess the role in HIV therapy of these twice-daily indinavir + ritonavir regimens.
This item appears in the following Collection(s)
- Academic publications [227696]
- Electronic publications [108794]
- Faculty of Medical Sciences [87091]
- Open Access publications [77993]
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.