The NHS says side effects are usually minor, although they can be unpleasant, including symptoms like headaches, diarrhoea and feeling sick.
The British Heart Foundation says muscle aches and pains are one of the most common side effects of statins.
Taking other medicines while you’re taking statins can make statins less effective, so make sure you tell your doctor all the medicines you currently take.
If you are taking types of statins called simvastatin or atorvastatin, you should avoid eating grapefruits or drinking grapefruit juice, as it can cause nasty side effects.