Nikhil Prasad Fact checked by:Thailand Medical News Team Sep 13, 2026 57 minutes ago
Statins are among the world’s most widely used cholesterol-lowering drugs, but a new scientific review is drawing attention to a rare neurological concern: in susceptible people, the medicines may trigger new myasthenia gravis (MG) or worsen existing disease.
A scientific review suggests statins may trigger or worsen myasthenia gravis in a small group of biologically susceptible patients
Researchers Xiao Tian and Peixiang Zhang, from the Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine in Baltimore, reviewed clinical and mechanistic evidence surrounding the association. Statins remain crucial for preventing atherosclerotic cardiovascular disease, so the authors stress that the findings do not support routinely stopping treatment.
What the clinical evidence shows
MG is an autoimmune disorder in which communication between nerves and muscles is disrupted, producing fluctuating weakness that typically worsens with activity and improves with rest. Symptoms can include drooping eyelids, double vision, difficulty speaking or swallowing, and weakness affecting the limbs.
Case reports and observational evidence have described MG developing or worsening within weeks to months after statin treatment began. Reported drugs include simvastatin, rosuvastatin, atorvastatin, and pravastatin. Some patients improved substantially after discontinuation, while a small number experienced symptoms again when rechallenged. Rare deterioration in people with established MG has progressed to myasthenic crisis requiring hospitalization.
However, this
Thailand Medical News report emphasizes an important limitation: the evidence establishes an association, not definitive proof that statins directly cause MG. Much of the literature consists of case reports, pharmacovigilance data, retrospective studies, and newer population-based observational research.
Four pathways may help explain the link
The review proposes four overlapping biological mechanisms. Statins block HMG-CoA reductase in the mevalonate pathway. While this lowers cholesterol, it can also reduce downstream substances important to cellular function.
First, reduced dolichol availability could interfere with glycosylation, a process needed for proper protein processing. The researchers’ pathway analysis of 40 genes implicated in congenital myasthenic syndromes identified N-glycan biosynthesis as the most significantly enriched pathway, strengthening the hypothesis that glycosylation vulnerability may matter.
Second, depletion of isoprenoids may alter immune-cell signaling and weaken mechanisms that normally maintain immune tolerance. Third, changes in cholesterol homeostasis could disturb lipid rafts and acetylcholine-receptor clustering at the neuromuscular junction. Fourth, reduced coenzyme Q10 could impair mitochondrial energy production, increase oxidative stress, and reduce the energy reserve needed for reliable nerve-to-muscle signaling.
Distinguishing MG from statin-related muscle disease
The authors also warn that MG can be confused with st
atin-associated myopathy. Immune-mediated necrotizing myopathy generally causes persistent proximal weakness and markedly elevated creatine kinase, whereas MG usually causes fatigable, fluctuating weakness with normal or only mildly elevated creatine kinase. Antibody tests and electrophysiological studies can further clarify the diagnosis.
Conclusion
The evidence suggests statins may lower the threshold for neuromuscular-junction failure in a biologically susceptible minority, but cardiovascular benefits remain substantial. Future prospective studies must quantify the risk, identify genetic and immune biomarkers, and determine which patients need closer monitoring or personalized lipid-lowering strategies rather than routine statin avoidance.
The study findings were published in the peer reviewed International Journal of Molecular Sciences.
https://www.mdpi.com/1422-0067/27/18/8150
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