Common side effects
Although side effects can vary between different statins, common side effects (which affect up to 1 in 10 people) include:
- sore throat
- a runny or blocked nose (non-allergic rhinitis)
- feeling sick
- problems with the digestive system, such as constipation, diarrhoea, indigestion or flatulence
- muscle and joint pain
- increased blood sugar level (hyperglycaemia)
- an increased risk of diabetes
However, it's not clear whether most of the common problems people experience when taking statins are actually caused by the medication itself.
Uncommon side effects
Uncommon side effects of statins (which may affect up to 1 in 100 people) include:
- being sick
- loss of appetite or weight gain
- difficulty sleeping (insomnia) or having nightmares
- dizziness – if you experience this, do not drive or use tools and machinery
- loss of sensation or tingling in the nerve endings of the hands and feet (peripheral neuropathy)
- memory problems
- blurred vision – if you experience this, do not drive or use tools and machinery
- ringing in the ears
- inflammation of the liver (hepatitis), which can cause flu-like symptoms
- inflammation of the pancreas (pancreatitis), which can cause stomach pain
- skin problems, such as acne or an itchy red rash
- feeling unusually tired or physically weak
Rare side effects
Rare side effects of statins (which may affect up to 1 in 1,000 people) include:
- visual disturbances
- bleeding or bruising easily
- yellowing of the skin and whites of the eyes (jaundice)
Statins can occasionally cause muscle inflammation (swelling) and damage. Speak to your doctor if you have muscle pain, tenderness or weakness that can't be explained – for example, pain that isn't caused by physical work.
Your doctor may carry out a blood test to measure a substance in your blood called creatine kinase (CK), which is released into the blood when your muscles are inflamed or damaged.
If the level of CK in your blood is more than 5 times the normal level, your doctor may advise you to stop taking the statin. Regular exercise can sometimes lead to a rise in CK, so tell your doctor if you've been exercising a lot.
Once your CK level has returned to normal, your doctor may suggest you start taking the statin again, but at a lower dose.
Reporting side effects
The Yellow Card Scheme allows you to report suspected side effects from any type of medicine you're taking. It's run by a medicines safety watchdog called the Medicines and Healthcare Products Regulatory Agency (MHRA).
See the Yellow Card Scheme website for more information.