Efavirenz is a non-nucleoside reverse transcriptase inhibitor used to treat HIV infection or prevent the spread of HIV. If efavirenz is coadministered with voriconazole, the voriconazole maintenance dose should be increased to 400 mg every 12 hours and the efavirenz dose should be decreased to 300 mg once daily using the capsule formulation (one 200 mg and two 50 mg capsules or six 50 mg capsules). Efavirenz tablets must not be broken. [see Drug Interactions (7. 1, Table 5) and Clinical Pharmacology (12.3. Efavirenz: side effects, dosage, interactions, FAQs, reviews. Used for: HIV-1 infection, nonoccupational exposure, occupational exposure Sustiva is used to treat HIV, which causes acquired immunodeficiency syndrome (AIDS). Learn about side effects, interactions and indications. Efavirenz is used to treat human immunodeficiency virus (HIV) infection. Efavirenz is in a class of medications called non-nucleoside reverse transcriptase inhibitors (NNRTIs). It works by decreasing the amount of HIV in the blood. Although efavirenz does not cure HIV, it may decrease your chance of developing acquired immunodeficiency syndrome (AIDS) and HIV-related illnesses. Taking these. Find patient medical information for Efavirenz (Sustiva) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Check with your doctor before taking efavirenz with alcohol or other medicines that affect the central nervous system (CNS). The use of alcohol or other medicines that affect the CNS with efavirenz may worsen the side effects of this medicine, such as dizziness, poor concentration, drowsiness, unusual dreams, and trouble with sleeping. Efavirenz is a drug prescribed for the treatment of the human immunodeficiency virus (HIV). Review side effects, dosage, drug interactions, warnings and precautions, and pregnancy safety information. Efavirenz (EFV), sold under the brand names Sustiva among others, is an antiretroviral medication used to treat and prevent HIV/AIDS. [1] It is generally recommended for use with other antiretrovirals. [1] Drug information about efavirenz for patients: important things to know, what to tell your doctor before using, how to use, side effects, and more.