It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly and to check for unwanted effects.
This medicine commonly causes a flu-like reaction, with aching muscles, fever and chills, and headache. To prevent problems from your temperature going too high, your doctor may ask you to take acetaminophen before each dose of gamma interferon. You may also need to take it after a dose to bring your temperature down. Follow your doctor's instructions carefully about taking your temperature, and how much and when to take the acetaminophen.