Plasma and Intracellular Concentrations of Raltegravir and Etravirine Administered Once Daily (RAET)

Plasma and Intracellular Concentrations of Raltegravir and Etravirine Administered Once Daily (800 mg and 400 mg, Respectively) Compared With Standard Dosing (400 mg and 200 mg/12 h) in Patients With HIV Infection

Hypothesis: the intracellular concentrations of raltegravir (RAL) and etravirine (ETV) administrated as 800 and 400 mg once a day, respectively, are similar to those obtained with the standard doses of 400 and 200 mg/12h, respectively. Objective: To analyze the plasma and intracellular concentrations of RAL and ETV administrated as 800 and 400 mg once daily respectively compared with standard doses of 400 and 200 mg/12h, respectively, and if they support its once daily administration.

Objective: To analyze the plasma and intracellular concentrations of RAL and ETV administrated as 800 and 400 mg once daily respectively compared with standard doses of 400 and 200 mg/12h, respectively, and if they support its once daily administration. Method: Phase IV, prospective, open labelled clinical trial with a planned duration of 24 weeks in which 16 patients from Hospitales Universitarios Virgen del Rocío will be enrolled. A 12 hours pharmacokinetic profile (immediately before and after 1, 2, 3, 4, 6, 8, 10 and 12 h) will be obtained after a supervised drug intake while taking RAL or ETV bid. Afterwards,the patients will take RAL or ETV once a day for 7 - 10 days. Subsequently, a new pharmacokinetic profile (predose and after 1, 2, 3, 4, 6, 8, 10, 12, 16, 20 and 24 h after a supervised drug intake) will be obtained.

Changes in pharmacokinetic parameters (Cmax, Cmin, AUC, t1/2, and Cl), both in plasma and intracellular, of RAL and ETV.

Inclusion Criteria: Adult HIV-1-infected patients taking raltegravir- or etravirine-based antiretroviral regimens Exclusion Criteria: Pregnancy Concomitant use of drugs that have potential interactions with raltegravir or etravirine pharmacokinetics Cirrhosis with clinical or analytic data of liver failure. Clinical history suggesting malabsorption or presence of diarrhea (> 3 stools / day) that could interfere with the absorption of study drugs.

Gutierrez-Valencia A, Martin-Pena R, Torres-Cornejo A, Ruiz-Valderas R, Castillo-Ferrando JR, Lopez-Cortes LF. Intracellular and plasma pharmacokinetics of 400 mg of etravirine once daily versus 200 mg of etravirine twice daily in HIV-infected patients. J Antimicrob Chemother. 2012 Mar;67(3):681-4. doi: 10.1093/jac/dkr534. Epub 2011 Dec 21.