Painful Side Effect of Statins Explained After Decades of Mystery Scientists think they’ve finally unravelled a long-standing puzzle surrounding a frustrating side effect of statin medicines — the widely prescribed drugs that help lower “bad” cholesterol and reduce the risk of heart attacks and strokes. For years, many patients and doctors have noticed that some people on statins develop muscle aches, weakness, cramps and fatigue, leading some to stop treatment despite the heart-protective benefits. Now, researchers have begun to explain why this happens at a cellular level.
Statins are designed to block an enzyme needed for cholesterol production in the liver, effectively lowering LDL cholesterol in the bloodstream. This helps prevent dangerous plaque buildup in arteries and reduces cardiovascular risk. But the new research shows that statins can also interact “off target” with a protein found in muscle cells called the ryanodine receptor 1 (RyR1).
RyR1 acts as a gate controlling the flow of calcium ions into muscle cells — a process central to normal muscle contraction. Using advanced imaging called cryo-electron microscopy, scientists observed how statin molecules bind to this receptor and force it to remain open, causing a continuous influx of calcium into muscle fibers. That excess calcium can damage muscle tissue directly, trigger enzymes that degrade muscle, and lead to the pain and weakness many patients describe.
About 10 % of people taking statins experience these muscle symptoms, known in research as statin-associated muscle symptoms (SAMS). The findings suggest that calcium leakage in muscle cells may be a major part of the explanation for those cases. While this mechanism may not account for all muscle complaints, the discovery helps clarify the biological process behind at least some instances of statin intolerance.
Because statins remain among the most widely used drugs in the world, affecting tens of millions of adults, understanding this side effect has important implications. Researchers say the new insight could pave the way for designing safer cholesterol-lowering drugs that retain their benefits without causing muscle harm. In early experiments, treatments that prevent calcium leakage appeared to protect muscle cells in laboratory models, pointing toward future options for people who struggle with statin-related muscle pain.
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