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Efavirenz pharmacokinetics in HIV-infected persons receiving rifapentine and isoniazid for tuberculosis prevention
Clinical Infectious Diseases
Background: Concomitant use of rifamycins to treat or prevent tuberculosis can result in subtherapeutic concentrations of antiretroviral drugs. We studied the interaction of efavirenz with daily rifapentine and isoniazid in human immunodeficiency virus (HIV)-infected individuals receiving a 4-week regimen to prevent tuberculosis.
Methods: Participants receiving daily rifapentine and isoniazid with efavirenz had pharmacokinetic evaluations at baseline and weeks 2 and 4 of concomitant therapy. Efavirenz apparent oral clearance was estimated and the geometric mean ratio (GMR) of values before and during rifapentine and isoniazid was calculated. HIV type 1 (HIV-1) RNA was measured at baseline and week 8.
Podany AT, Bao Y, Swindells S, Chaisson RE, Andersen JW, Mwelase T, Supparatpinyo K, Mohapi L, Gupta A, Benson Cam, Kim P, Fletcher CV on behalf of the ACTG A5279 Study Team. Efavirenz pharmacokinetics in HIV-infected persons receiving rifapentine and isoniazid for tuberculosis prevention. Clin Infect Dis. 2015;16 Jun. pii: civ464.