The most common side effects
Even common side effects like nausea (feeling sick), diarrhoea and tiredness, are less common with modern treatments. They usually become easier after the first few weeks.
- Very rarely, nausea and tiredness can be a symptom of another illness.
- This is why you should tell your doctor of any problems.

- If the first anti-nausea or diarrhoea medications do not help, ask for more effective drugs.
One of the most used drugs (efavirenz) can affect sleep patterns and change your mood.
You need information about this before starting treatment. These side effects are usually strongest when you first start treatment.
They usually reduce in most people over the first few weeks. If the side effects continue, you can use another drug.