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• W2938353225 abstract "Tuberculosis (TB) causes 25% of all deaths among individuals infected with human immunodeficiency virus (HIV). Rifampicin (RIF) is a potent inducer of drug metabolizing enzymes and drug transporters, and co-administration with dolutegravir (DTG) reduces DTG exposure; this can be overcome by doubling the DTG dose to 50 mg twice daily. This study investigated the effect of RIF on DTG exposure when dosed at 100 mg once daily, which could provide an easier option than 50 mg twice daily. An open label, pharmacokinetic (PK) study was undertaken. Healthy HIV-negative subjects received DTG 50 mg for 7 days (PK1), DTG 100 mg for 7 days (PK2), RIF for 14 days, DTG 50 mg + RIF for 7 days (PK3) and DTG 100 mg + RIF for 7 days (PK4). Steady-state full DTG PK profiles were evaluated. DTG geometric mean ratios (GMRs) of PK3/PK1 of maximum concentration (Cmax), area under curve (AUC24h) and 24-h post-dose concentration (C24h) were 0.65 [90% confidence interval (CI) 0.55–0.75], 0.44 (90% CI 0.37–0.52) and 0.15 (0.13–90% CI 0.17), respectively. GMRs of PK4/PK1 Cmax, AUC24h and C24h were 1.09 (90% CI 0.97–1.21), 0.74 (90% CI 0.64–0.86) and 0.24 (90% CI 0.20–0.28), respectively. Median C24h of DTG 50 mg + RIF and DTG 100 mg + RIF were 251 (range 129–706) ng/mL and 140 (range 73–426) ng/mL, respectively. Although there were substantial reductions in DTG C24h when co-administered with RIF, concentrations of both DTG 50 mg and 100 mg once daily with RIF were still above the protein-binding-adjusted IC90 (drug concentration required to inhibit 90% of in-vitro viral replication) of 64 ng/mL. Further studies in HIV-TB co-infected individuals are warranted to confirm these results." @default.
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• W2938353225 date "2019-08-01" @default.
• W2938353225 modified "2023-10-02" @default.
• W2938353225 title "Pharmacokinetics of dolutegravir 100 mg once daily with rifampicin" @default.
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• W2938353225 doi "https://doi.org/10.1016/j.ijantimicag.2019.04.009" @default.
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