1 års varighed med efavirenz i kombination med NRTI´ere og/ eller PI´ere har vist en reduktion i mængden af virus i blodet til under detektionsgrænsen i assayet og stigning i CD4 lymfocytter hos antiretroviral behandlingsnaive og NRTI- behandlede HIV- inficerede patienter.
Two controlled studies (006 and ACTG 364) of approximately one year duration with efavirenz in combination with NRTIs and/ or PIs, have demonstrated reduction of viral load below the limit of quantification of the assay and increased CD4 lymphocytes in antiretroviral therapy-naïve and NRTI-experienced HIV-infected patients.