How Do Statins Work?

Statins lower cholesterol by inhibiting HMG-CoA reductase, an enzyme critical for cholesterol production in the liver. This inhibition triggers an increase in LDL receptor activity, enhancing the liver's ability to clear cholesterol from the bloodstream.

How Effective Are Statins?

Statins are remarkably effective at lowering LDL cholesterol, but the relationship between dosage and results is not straightforward. The most significant impact happens with the initial dose: just 1 mg of rosuvastatin can reduce LDL levels by about 34%. Beyond that, as the dose increases, the additional cholesterol reduction becomes less pronounced.

This phenomenon of diminishing returns highlights the value of starting with a low dose, which often achieves substantial results while minimizing the risk of side effects. For those needing further reductions, combining rosuvastatin with other medications like ezetimibe can be a more effective and safer option than increasing the statin dose.

Muscle Pain

Muscle pain is the most commonly discussed side effect of statins, but it's important to put the risk into perspective. Despite the attention this issue receives, statin-associated muscle pain affects only a small fraction of users, about 5% overall.

Even in large clinical trials, the actual risk appears modest. For example, in the JUPITER trial, muscle pain was reported at a rate of 4.1 events per 100 person-years among rosuvastatin users, compared to 3.7 events per 100 person-years in the placebo group. This small difference suggests that the vast majority of statin users do not experience significant muscle symptoms.

Choosing the right statin also matters. Research shows that rosuvastatin is associated with significantly fewer reports of muscle pain than atorvastatin—4.38% versus 14.21%, respectively. By starting with a low dose of rosuvastatin and gradually adjusting if necessary, the risk of muscle-related side effects can be minimized even further.

Diabetes Risk

Statins are associated with a 9% to 13% increased risk of developing new-onset diabetes.

Those with existing insulin resistance or prediabetes are particularly vulnerable and may experience an accelerated progression to diabetes. For these high-risk individuals, starting with a low dose of statins—such as 2.5 mg of rosuvastatin—can help minimize this risk, as diabetes progression is more pronounced with high-intensity statin therapy.

Through careful monitoring of blood sugar trends, those who are predisposed to diabetes can also benefit from the cardiovascular protection of statins while minimizing their impact on metabolic health.

Liver Effects

While statins can cause a mild increase in liver enzymes, known as transaminitis, this effect is typically asymptomatic and dose-related. For most patients, these enzyme elevations do not indicate liver damage and often resolve on their own without any changes to the medication.

In fact, research found that individuals with elevated liver enzymes due to statin therapy are no more likely to develop severe liver injury than those with normal levels. This underscores that statins are safe for most individuals, regardless of liver enzyme status. Regular monitoring can also provide peace of mind, ensuring that elevated liver enzymes never reach a concerning level.

Final Thoughts

Statins are a cornerstone of cardiovascular risk reduction, reducing cardiovascular mortality by 31% and offering clear benefits for most patients. While side effects such as muscle pain and increased diabetes risk can occur, they are often manageable through careful dose selection and combination therapy.

If you're unsure whether statins are right for you, a personalized approach, for example Instalab's Heart Health Program, can help you navigate these decisions.