Safety and efficacy of once-daily didanosine, tenofovir and nevirapine as a simplification antiretroviral approach.

Methods: One-hundred-and-sixty-nine patients with chronically suppressed viral load (limit of detection 50 copies/ml) were recruited. Based on patient willingness to simplify treatment, 84 of them continued receiving their usual treatment (BID Group) and 85 switched to once-daily didanosine/tenofovir/nevirapine (QD Group) in a non-randomized fashion.

Results: At week 48, the proportion of patients with viral suppression in the QD and in the BID Group, respectively, was 97 vs 100% in the per-protocol analysis (P = 0.497), and 76 vs 86% for the intention-to-treat analysis (P = 0.176). Nevertheless, CD4 count decreased in the QD Group, with a mean decline of 95 cells/mm3 (95% CI: 45-145). Twelve subjects in the QD Group (14%) discontinued treatment due to adverse events, mainly nevirapine-related hepatitis (6%). No significant differences regarding the rate of acute pancreatitis or peripheral neuropathy were observed between both groups. A significant improvement in the lipid profile was only seen in the QD Group. High levels of adherence were observed in both groups during follow-up, as well as a good quality of life. At week 48, a reduction in effort to take medication (P or = 0.001) and an increment in the satisfaction with the treatment (P 0.001) was only seen in the QD group. No differences were observed in median nevirapine trough levels between patients on twice-daily nevirapine at baseline (4820 ng/ml) and subjects in the QD Group (6090 ng/ml, P = 0.30).

Conclusion: At week 48, the proportion of patients with viral suppression in the QD and in the BID Group, respectively, was 97 vs 100% in the per-protocol analysis (P = 0.497), and 76 vs 86% for the intention-to-treat analysis (P = 0.176). Nevertheless, CD4 count decreased in the QD Group, with a mean decline of 95 cells/mm3 (95% CI: 45-145). Twelve subjects in the QD Group (14%) discontinued treatment due to adverse events, mainly nevirapine-related hepatitis (6%). No significant differences regarding the rate of acute pancreatitis or peripheral neuropathy were observed between both groups. A significant improvement in the lipid profile was only seen in the QD Group. High levels of adherence were observed in both groups during follow-up, as well as a good quality of life. At week 48, a reduction in effort to take medication (P or = 0.001) and an increment in the satisfaction with the treatment (P 0.001) was only seen in the QD group. No differences were observed in median nevirapine trough levels between patients on twice-daily nevirapine at baseline (4820 ng/ml) and subjects in the QD Group (6090 ng/ml, P = 0.30).