ArticleClinical infectious diseases : an official publication of the Infectious Diseases Society of America2026
Pharmacokinetics of Twice-daily Tenofovir Alafenamide in Adults With HIV-associated Tuberculosis on Bictegravir/Emtricitabine/Tenofovir Alafenamide and Rifampicin.
Article in Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04734652 (A Phase 2b Study to Evaluate the Efficacy, Safety and PK of a Combination of Bictegravir, Emtricitabine, and Tenofovir Alafenamide Fumarate for Treatment of HIV-1 Infection in Patients With Drug Susceptible-TB on a Rifampicin-based Regimen), which is not on this map. Cited by 2 papers.
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A Phase 2b Study to Evaluate the Efficacy, Safety and PK of a Combination of Bictegravir, Emtricitabine, and Tenofovir Alafenamide Fumarate for Treatment of HIV-1 Infection in Patients With Drug Susceptible-TB on a Rifampicin-based Regimen
Who cites it
2 citing papers in PubMed.
- HBV/HCV coinfection and anti-tuberculosis drug-induced liver injury: from risk assessment and exploration of mechanisms to preventive considerations.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2026Review
- The multifaceted antiretroviral coverage provided by BIC/FTC/TAF: a pharmacokinetic/pharmacodynamic revisitation.Le infezioni in medicina · 2026Review
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12 authors.
Funding
Abstract
backgroundTenofovir alafenamide (TAF) is a key component of many fixed-dose combinations used to treat HIV. There are limited data on the pharmacokinetics of plasma TAF, tenofovir (TFV), or intracellular tenofovir diphosphate (TFV-DP), among people with HIV (PWH) and tuberculosis (TB) who are taking rifampicin-based TB treatment.
methodsParticipants in the intervention arm of the INSIGHT trial (NCT04734652) receiving bictegravir/emtricitabine/TAF (BIC/FTC/TAF 50/200/25 mg) were enrolled into the semi-intensive pharmacokinetic substudy. BIC/FTC/TAF was administered twice-daily during rifampicin-based TB treatment (∼24 weeks) and once-daily thereafter. Plasma (TAF/TFV) and dried blood spot samples (TFV-DP) were collected at weeks 4 and 12 (predose, 1, 2, 4, 6, and 8-12 hours postdose) during TB treatment and at week 32 (predose, 1, 2, 4, 6-8 and 24-25 hours postdose) post-TB treatment. Pharmacokinetic parameters were determined using noncompartmental analysis. Clinical and safety data were collected.
resultsAmong 43 participants enrolled; median (IQR) age and weight were 35 (30-39) years and 58 (52-65) kg; 77% were male. Geometric least square mean ratios (90% CI) at week 12 (twice-daily TAF) relative to week 32 (once-daily TAF) for TAF AUC0-4, TFV, and TFV-DP AUC0-24 were 1.55 (1.13-2.13), 1.24 (1.07-1.44), and 1.32 (1.13-1.53), respectively. At week 24, 95% of participants achieved viral suppression, with no treatment-related serious adverse events or drug discontinuations.
conclusionsTwice-daily TAF was safe and efficacious and achieved similar exposures of intracellular TFV-DP in PWH taking rifampicin for TB compared to once-daily TAF taken alone. These data support the use of TAF in a fixed-dose combination of BIC/FTC/TAF during rifampicin-containing TB treatment.
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