Efavirenz may cause dizziness, difficulty in concentrating, or drowsiness Make sure you know how you react to this drug before you drive, use machines, or do anything else that could be dangerous if you are dizzy or are not alert.
Check with your physician before taking efavirenz with alcohol or other medication that effect the central nervous system - CNS. The use of alcohol or other medication that effect the CNS with efavirenz may worsen the side effects of this drug, such as dizziness, poor concentration, drowsiness, unusual dreams and trouble in sleeping. Some examples of medication that effect the CNS are antihistamines or drug for hay fever, other allergies, or colds; sedatives, tranquilizers, or sleeping drug; drug for depression; drug for anxiety; prescription pain drug or narcotics; barbiturates; drug for attention deficit and hyperactivity disorder; drug for seizures; muscle relaxants; or anesthetics, including some dental anesthetics.
Efavirenz does not decrease the risk of transmitting the HIV infection to others through sexual contact or by contamination through blood.
Women of childbearing potential must use two forms of birth control while taking this drug, a barrier method of contraception and an oral or other hormonal method of contraception.