Efavirenz is used with other medicines to control HIV.
Take efavirenz as directed, usually at night time. It is very important to take it regularly. If you often forget to take efavirenz, it may not work as well.
Take the tablets with a glass of water.
Measure the liquid carefully with an oral syringe or measuring spoon.
If it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.
Efavirenz can react with many medicines, sometimes with severe results.
Tell your pharmacist or doctor about all medicines or treatments that you may be taking including vitamins, herbal products, or recreational drugs.
|Side Effects||Recommended action|
Severe skin rash, skin peeling or blisters
|Stop taking and see your doctor immediately|
Symptoms of liver problems including: yellow skin or eyes, itching, dark urine, pale bowel motions, abdominal pain
|Tell your doctor immediately|
Unusual behaviour or thinking, low mood, nervousness, anxiety
|Tell your doctor|
|Tell your doctor if troublesome|
Drowsiness, dizziness, trouble concentrating, tiredness or weakness, headache
Trouble sleeping, strange dreams
|Common when you first start but should improve in a few weeks. Taking at night may help. If these continue or are severe, tell your doctor.|
|This can occur in the first few weeks. Rarely, this may be serious. Ring your clinic to check|
If you notice any other effects, discuss them with your doctor or pharmacist.
This leaflet contains important, but not all, information about this medicine.
Prepared by the PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. January 2020
For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?
Click on buttons to copy web addresses for this leaflet:
If your browser does not automatically copy these links use its copy command instead.
My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.
For more information about the sheets, see: What does a My Medicines sheet cover?
My Medicines is developed by a team at the Canterbury District Health Board. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed