ArticleTherapeutic drug monitoring2011
Influence of body weight on achieving indinavir concentrations within its therapeutic window in HIV-infected Thai patients receiving indinavir boosted with ritonavir.
Article in Therapeutic drug monitoring, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT00162682 (A Phase III, Randomized, Non-inferiority Trial Comparing the Standard Viral Load Based Antiretroviral Monitoring Strategy With a CD4 Based Monitoring Strategy Among Antiretroviral Naive Immunocompromised Adults in Thailand), which is not on this map. Cited by 4 papers.
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The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
A Phase III, Randomized, Non-inferiority Trial Comparing the Standard Viral Load Based Antiretroviral Monitoring Strategy With a CD4 Based Monitoring Strategy Among Antiretroviral Naive Immunocompromised Adults in Thailand
Who cites it
4 citing papers in PubMed.
- Assessment of Nevirapine Prophylactic and Therapeutic Dosing Regimens for Neonates.Journal of acquired immune deficiency syndromes (1999) · 2017Trial
- Simultaneous determination of antiretroviral drugs in human hair with liquid chromatography-electrospray ionization-tandem mass spectrometry.Journal of chromatography. B, Analytical technologies in the biomedical and life sciences · 2018Article
- Reduced indinavir exposure during pregnancy.British journal of clinical pharmacology · 2013Article
- Clinical pharmacokinetics of antiretroviral drugs in older persons.Expert opinion on drug metabolism & toxicology · 2013Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
11 authors.
Funding
Abstract
Indinavir boosted with ritonavir (IDV/r) dosing with 400/100 mg, twice daily, is preferred in Thai adults, but this dose can lead to concentrations close to the boundaries of its therapeutic window. The objectives of this analysis were to validate a population pharmacokinetic model to describe IDV/r concentrations in HIV-infected Thai patients and to investigate the impact of patient characteristics on achieving adequate IDV concentrations. IDV/r concentration data from 513 plasma samples were available. Population means and variances of pharmacokinetic parameters were estimated using a nonlinear mixed effects regression model (NONMEM Version VI). Monte Carlo simulations were performed to estimate the probability of achieving IDV concentrations within its therapeutic window. IDV/r pharmacokinetics were best described by a one-compartment model coupled with a single transit compartment absorption model. Body weight influenced indinavir apparent oral clearance and volume of distribution and allometric scaling significantly reduced the interindividual variability. Final population estimates (interindividual variability in percentage) of indinavir apparent oral clearance and volume of distribution were 21.3 L/h/70 kg (30%) and 90.7 L/70 kg (22%), respectively. Based on model simulations, the probability of achieving an IDV trough concentration greater than 0.1 mg/L was greater than 99% for 600/100 mg and greater than 98% for 400/100 mg, twice daily, in patients weighing 40 to 80 kg. However, the probability of achieving IDV concentrations associated with an increased risk of drug toxicity (greater than 10.0 mg/L) increased from 1% to 10% with 600/100 mg compared with less than 1% with 400/100 mg when body weight decreased from 80 to 40 kg. The validated model developed predicts that 400/100 mg of IDV/r, twice daily, provides indinavir concentrations within the recommended therapeutic window for the majority of patients. The risk of toxic drug concentrations increases rapidly with IDV/r dose of 600/100 mg for patients less than 50 kg and therapeutic drug monitoring of IDV concentrations would help to reduce the risk of IDV-induced nephrotoxicity.
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