Statins explained: who needs them and the truth about side effects

What statins actually do

Statins lower the amount of LDL — so-called "bad" cholesterol — circulating in your blood. They do this by blocking an enzyme the liver uses to make cholesterol, which prompts the liver to clear more LDL from the blood. Lower LDL means less cholesterol is deposited in artery walls over the years, and that translates into fewer heart attacks and strokes. The benefit builds quietly over time; it is not something you feel day to day, which is part of why some people question whether the tablet is "doing anything".

Who benefits most

Statins are used in two broad situations. The first is secondary prevention: if you have already had a heart attack or stroke, or have known heart or vascular disease, a statin clearly lowers the chance of another event, and the case for treatment is strong. The second is primary prevention: if you have not had an event but your overall cardiovascular risk is raised — because of age, blood pressure, diabetes, family history and cholesterol together — a statin can meaningfully lower that risk. Your clinician estimates this overall risk rather than treating a cholesterol number in isolation.

The side-effect debate

The effect people worry about most is muscle aches. Genuine, significant muscle problems are uncommon, and serious muscle injury is rare. Importantly, large blinded studies have found that most muscle symptoms reported on statins also occur when people unknowingly take a dummy tablet — meaning many symptoms blamed on statins are not actually caused by them. That does not dismiss anyone's experience; it means symptoms are worth testing rather than assuming. If aches appear, your clinician can pause and re-challenge, switch statin, or adjust the approach. Liver blood tests are checked, and very rarely a serious muscle breakdown can occur, so severe or widespread muscle pain — especially with dark urine — should always be reported.

Getting the most from a statin

Statins are taken long-term, and stopping them allows cholesterol — and risk — to drift back up. Some statins work best taken at night; others can be taken at any time. They work alongside, not instead of, the things that also lower cardiovascular risk: not smoking, physical activity, a healthier diet, and treating blood pressure and diabetes. If side effects or cost of benefit are a concern, that is a conversation to have with your prescriber rather than simply stopping.