Scientists have identified a surprising reason why Lipitor, one of America’s most widely prescribed cholesterol drugs, may cause muscle pain and weakness.
The research, highlighted by ScienceDaily, shows that atorvastatin can interfere with a protein controlling calcium inside muscle cells. The resulting calcium leak may help explain why some patients experience muscle problems while taking statins.
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Scientists Found an Unexpected Reaction Inside Muscle Cells
Researchers at the University of British Columbia and University of Wisconsin-Madison used cryo-electron microscopy to examine a protein called the ryanodine receptor, or RyR1.
Normally, this protein releases calcium when muscles contract. But the study, published in Nature Communications in 2025, revealed that atorvastatin can force the channel open, potentially allowing calcium to escape when it shouldn’t.
“We were able to see, almost atom by atom, how statins latch onto this channel,” said lead researcher Steven Molinarolo, PhD, a postdoctoral researcher at UBC.
The researchers identified an unusual mechanism: Three atorvastatin molecules bind together within the protein. The first primes the channel to open, while two additional molecules help trigger its opening.
The findings provide a possible biological explanation for statin-associated muscle symptoms, although the laboratory experiments cannot establish how often this mechanism causes pain in patients.
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The Discovery Could Lead to Safer Cholesterol Drugs
The implications extend beyond explaining muscle soreness.
According to UBC researchers, understanding precisely where atorvastatin binds could help scientists redesign cholesterol medications without disrupting their cardiovascular benefits.
“It’s a big step forward because it gives us a roadmap for designing statins that don’t interact with muscle tissue,” said senior researcher Filip Van Petegem, PhD, a UBC professor.
However, researchers used atorvastatin concentrations above typical measured blood levels to capture the molecular interaction. Further studies must establish its importance under normal treatment conditions.
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What This Means if You Take Statins
Statins remain important medications for reducing cardiovascular risk. Muscle symptoms deserve attention, but they don’t automatically mean the medication is damaging muscle tissue.
Patients experiencing persistent pain or weakness should discuss symptoms with their prescribing clinician. Severe muscle pain accompanied by dark urine or pronounced weakness warrants urgent medical evaluation.
For now, the discovery offers a possible path toward safer medications—not a reason to abandon an effective treatment.
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