Impact of tenofovir dose adjustment on both estimated glomerular filtration rate and tenofovir trough concentration

International audienceBackground: Tenofovir disoproxil fumarate (TDF)-based regimen is a treatment option for HIV-infected patients. TDF dose adjustment is recommended in patients with impaired renal function. We assessed the impact of TDF dose adjustment on renal function and tenofovir trough concentration.& para;& para;Methods: Fourteen HIV patients for whom TDF dose was adjusted (1 tablet/48 h) because of estimated glomerular filtration rate (eGFR) 90 ng/ml between 2006 and 2013 were selected. The eGFR was measured at baseline and 3, 6 and 12 months after TDF dose adjustment.& para;& para;Results: A 50% TDF dose reduction resulted in a significant increase of the eGFR 3 months after dose adjustment (61.1 versus 72.8 ml/min/1.73 m(2); P=0.003). Concomitantly, tenofovir trough concentration decreased from 175 to 66 ng/ml (P=0.009). Antiviral efficacy was maintained in all patients.& para;& para;Conclusions: TDF dose adjustment combined with therapeutic drug monitoring may be useful especially in patients at risk of kidney dysfunction