Interferon produces side effects in many people, especially in the early stages of treatment. The side effects vary from person to person. Some people get flu-like symptoms such as:
- nausea (feeling sick)
- headaches
- fever
- tiredness
- muscle aches
- depression.
This is not a full list of side effects. Often, flu-like symptoms can be helped by taking paracetamol before the interferon.
People who have very bad side effects may not be able to take a full dose or a full course. Because of the different side effects, blood tests are needed during treatment.
It is important to go for regular check-ups so that any side effects can be carefully monitored.