Efavirenz is an essential component of highly active antiretroviral therapy. It belongs to the class of drugs called non-nucleoside reverse transcriptase inhibitor. Efavirenz decreases the viral load in case of HIV infection. The common side effects of efavirenz are: - Vomiting - Nausea - Abdominal pain - Headache - Indigestion - Confusion - Forgetfulness - Anxiety and agitation - Body aches - Unusual dreams Some rare, dangerous adverse effects of efavirenz are: - Fever - Rash - Itching - Peeling - Oral ulcers - Pink eye - Swelling - Fainting - Lethargy - Seizures - Jaundice - Pain in right upper quadrant - Anorexia - Arrhythmias - Fainting Reference: https://medlineplus.gov/druginfo/meds/a699004.html Image via: https://medimoon.com/2014/10/efavirenz-free-regimens-prove-effective-for-initial-treatment-of-hiv/