A statin is a cholesterol-lowering medication that works by slowing down your liver’s production of cholesterol. Statins are among the most widely prescribed drugs in the world, used by tens of millions of people to reduce the risk of heart attack and stroke. They come in several varieties, ranging from mild to potent, and the right one depends on how much your cholesterol needs to come down.
How Statins Lower Cholesterol
Your liver produces most of the cholesterol in your body through a multi-step process. Statins block a specific enzyme that controls the pace of that process, effectively putting the brakes on cholesterol production. When the liver senses it has less cholesterol to work with, it responds by pulling more LDL (the “bad” cholesterol) out of your bloodstream. It does this by ramping up the number of receptors on its surface that grab onto LDL particles floating by. The net result is lower LDL levels in your blood, which means less cholesterol available to build up inside artery walls.
Types of Statins
Seven statins are currently approved and sold under both brand and generic names:
- Atorvastatin (Lipitor)
- Rosuvastatin (Crestor)
- Simvastatin (Zocor)
- Pravastatin (Pravachol)
- Lovastatin (Mevacor, Altoprev)
- Fluvastatin (Lescol)
- Pitavastatin (Livalo)
Some are also available in combination pills that pair a statin with another cholesterol-lowering ingredient. Vytorin, for example, combines simvastatin with ezetimibe, a drug that blocks cholesterol absorption in the gut.
Low, Moderate, and High Intensity
Not all statins are prescribed at the same strength. Doctors categorize statin therapy into three intensity levels based on how much they lower LDL cholesterol:
- Low intensity: reduces LDL by less than 30%
- Moderate intensity: reduces LDL by 30% to 49%
- High intensity: reduces LDL by 50% or more
The intensity depends on both which statin you take and the dose. Atorvastatin at 40 to 80 mg and rosuvastatin at 20 to 40 mg are considered high-intensity options, while lower doses of other statins fall into the moderate or low categories. Your doctor chooses the intensity based on your overall cardiovascular risk, not just your cholesterol number.
Who Takes Statins and Why
Statin prescriptions fall into two broad categories: preventing a first heart attack or stroke (primary prevention) and preventing another one (secondary prevention).
For people who have never had a cardiovascular event, the decision hinges on estimated risk. Current guidelines from the American College of Cardiology and American Heart Association use a calculator that estimates your chance of having a heart attack or stroke within the next 10 years. If that risk is intermediate (5% to 10%), a moderate-intensity statin is typically recommended. If the risk is high (10% or above), a high-intensity statin is the standard approach. For people at borderline risk (3% to 5%), a statin may be reasonable depending on additional factors. A coronary artery calcium scan, which detects early plaque buildup, can help tip the decision one way or the other when the choice isn’t clear-cut.
For people who already have heart disease, the case for statins is stronger. Guidelines recommend high-intensity therapy for most patients 75 and younger with established cardiovascular disease, aiming for at least a 50% drop in LDL. Those considered very high risk, such as people who have had multiple heart attacks or strokes, or who have a combination of risk factors like diabetes plus high blood pressure, may need additional medications on top of a statin.
Side Effects
Muscle pain is the most talked-about side effect of statins, and it’s the most common reason people stop taking them. Estimates of how often it occurs vary widely. In clinical studies where researchers tracked patients systematically, about 10% to 11% reported muscle symptoms. Survey data from patients themselves puts the number higher, sometimes as high as 25%. The discrepancy likely reflects the difficulty of separating statin-related muscle aches from the everyday aches that happen at the same age people tend to start these drugs.
Most statin-related muscle discomfort is mild soreness or weakness rather than anything dangerous. Severe muscle injury (a condition where muscle tissue breaks down and can harm the kidneys) is rare. When muscle symptoms do occur, they often improve with a switch to a different statin or a lower dose.
Routine liver monitoring is no longer considered necessary for most people on statins. Older guidelines called for regular liver enzyme tests, but current practice only recommends checking if symptoms of liver problems appear, such as unusual fatigue, loss of appetite, or yellowing of the skin.
When to Take Them
Timing matters, but mostly for certain statins. Your liver produces the most cholesterol overnight, so short-acting statins like simvastatin, lovastatin, fluvastatin, and pravastatin work best when taken in the evening. A systematic review found that evening dosing produced significantly greater LDL and total cholesterol reductions with short-acting statins compared to morning dosing.
Long-acting statins like atorvastatin and rosuvastatin stay in your system long enough that the time of day makes little practical difference. For these, the best time to take them is whatever time you’ll remember consistently. If you’re on a short-acting statin and have been taking it in the morning, switching to an evening dose could give you a small but real boost in effectiveness.
Drug Interactions to Know About
Statins are processed by the liver, and certain medications can interfere with that process, raising statin levels in the blood and increasing the risk of muscle problems. The calcium channel blocker verapamil, the heart rhythm drug amiodarone, and the blood thinner ticagrelor all require dose limits when combined with specific statins. Some combinations are avoided entirely: lovastatin and simvastatin should not be taken with the immunosuppressant tacrolimus, for example.
Grapefruit juice is a well-known interaction because it affects the same liver pathway, though it mainly matters for lovastatin and simvastatin. If you take atorvastatin or rosuvastatin, occasional grapefruit is unlikely to be an issue. Your pharmacist will flag interactions when filling a prescription, but it’s worth mentioning all your medications (including supplements) whenever a new one is added.