I don't want to take any chance of having side effects.

A little pain at the site of the shot is the most common side effect.

Call your doctor at once if you have a serious side effect.

This is a serious side effect of the drug and could lead to death.

Side effects are common and should be reported to the doctor.

I have not felt any bad side effects to date.

How do they work, exactly - and are there any serious side effects?

This serious side effect can happen days, weeks, or months after your treatment has finished.

The only side effect so far has been dry mouth.

We'll look at each major class of drug and tell you about the dangerous side effects.