Efavir is an antiviral medication that prevents human immunodeficiency virus (HIV) cells from multiplying in the body. Efavir is used to treat HIV, which causes the acquired immunodeficiency syndrome (AIDS). Efavirenz is not a cure for HIV or AIDS. Efavir may also be used for other purposes not listed in this medication guide.
Efavir may cause serious psychiatric symptoms including confusion, severe depression, suicidal thoughts, aggression, extreme fear, hallucinations, or unusual behavior. Contact your doctor at once if you have any of these side effects, even if you have had them before.
Do not use Efavir without telling your doctor if you are pregnant. It could harm the unborn baby. Use two forms of birth control, including a barrier form (such as a condom or diaphragm with spermicide gel) while you are taking Efavir, and for at least 12 weeks after your treatment ends. Tell your doctor if you become pregnant during treatment.
There are many other medicines that can interact with Efavir, or make it less effective. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.
Taking Efavir will not prevent you from passing HIV to other people. Talk with your doctor about safe methods of preventing HIV transmission during sex. Sharing drug or medicine needles is never safe, even for a healthy person.
Side effects: mild nausea, vomiting, or stomach pain, diarrhea or constipation; cough; blurred vision; headache, dizziness, tired feeling; trouble concentrating, problems with balance or coordination; muscle or joint pain; sleep problems (insomnia), unusual dreams; or changes in the shape or location of body fat (especially in your arms, legs, face, neck, breasts, and waist).
