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Current antiretroviral drugs cannot eradicate HIV infections, and persons living with HIV are often faced with very demanding daily therapeutic schedules that can induce poor adherence. More conveniently dosed and patient-friendly regimens are needed. We investigated, in this 48-week pilot study, a once-a-day highly active antiretroviral therapy regimen of didanosine, lamivudine and efavirenz. Seventy-five consecutive antiretroviral-naive subjects were enrolled. Over the 48-week period, plasma HIV-RNA levels declined sharply, with a median decrease at the end of the observation time &gt;3.4 log copies/ml. The proportion of patients achieving a plasma HIV-RNA level below the limit of detection (50 copies/ml) was 77% (intention to treat analysis) at the end of the study period. The mean CD4 cell count increased steadily over time from 251 to 459 cells/μl. Antiviral efficacy was similar in patients with a baseline HIV-RNA level above or below 100 000 copies/ml. However, patients with a baseline CD4 cell count &lt;200 cells/μl showed a significantly worse virological response than that observed in patients with higher baseline CD4 counts. Overall 15 patients interrupted therapy. In four cases treatment interruption was due to lack of treatment response; three additional patients were lost to follow-up or withdrew informed consent. Eight patients stopped therapy because of adverse events. The once-daily combination of didanosine, lamivudine and efavirenz resulted in sustained viral suppression and was well-accepted by patients. This regimen may offer advantages in selected difficult-to-treat populations, allows directly observed therapy and can be a safe and effective alternative in antiretroviral-naive patients. These encouraging pilot results need to be confirmed in a comparative clinical trial.

Virological and Immunological Responses to a Once-a-Day Antiretroviral Regimen with Didanosine, Lamivudine and Efavirenz