Conditions and symptoms
What Is Myopathy? Muscle Problems and Medicine Labels
Myopathy · say it: my-OP-uh-theeAlso written: muscle disease, muscle weakness, drug-induced myopathy
Short answer
Myopathy means a problem with the muscles themselves, often causing weakness, aches or cramps. Some medicines, like statins, can cause it.
What it means
Myopathy is a general word for a disease or problem of the muscle tissue. It can cause muscle weakness, especially in the thighs and upper arms, along with aches, cramps or stiffness. It can be inherited, caused by inflammation, thyroid problems or low vitamin D, or brought on by some medicines.
Labels for statins, some corticosteroids, some HIV medicines, colchicine and some others list myopathy as a possible side effect. The risk can rise with higher doses, kidney problems, older age or certain drug combinations. The warning is telling you to report unexplained muscle pain, tenderness or weakness, so your doctor can check a CK blood test and decide whether to change treatment.
Myalgia means muscle aches without true weakness or damage; myopathy means a muscle problem, often with weakness; rhabdomyolysis is the severe form, with rapid muscle breakdown that can harm the kidneys.
Where you may see it
- The 'Warnings' section of statin labels
- Leaflets under 'Muscle problems'
- Blood test reports showing creatine kinase (CK)
📄 How it looks on a report
Statins may cause myopathy and rhabdomyolysis. Risks increase with higher doses and concomitant use of certain drugs.
🙅 What it does not mean
- Not every muscle ache on a statin is myopathy; many aches have other causes.
- It does not mean you must stop your statin; your doctor may check tests or adjust the dose.
- Myopathy is not the same as rhabdomyolysis, which is rarer and more serious.
🎯 Check yourself
Which of these is the right meaning of “Myopathy”?
🗒️ Questions to ask your doctor
💊 Medicines whose labels mention “Myopathy”
Plain-English explanations of each medicine, from its official FDA label.
- Apixaban
A factor Xa inhibitor, a blood thinner medicine (anticoagulant)
- Atorvastatin
a statin, a cholesterol-lowering medicine of the HMG-CoA reductase inhibitor type
- Azithromycin
a macrolide antibacterial (antibiotic) medicine
- Ciprofloxacin
a fluoroquinolone antibacterial medicine
- Clonazepam
a benzodiazepine, a type of medicine that slows activity in the central nervous system
- Colchicine
an alkaloid medicine, a compound obtained from the autumn crocus plant (colchicum autumnale)
- Dexamethasone
A corticosteroid, a synthetic adrenocortical steroid medicine that lowers inflammation and suppresses the immune system
- Diazepam
A benzodiazepine, a type of medicine that slows activity in the central nervous system (brain and spinal cord)
- Hydroxychloroquine
an antimalarial and antirheumatic drug, which means it is used for malaria and for certain joint and immune conditions
- Levofloxacin
an antibiotic of the fluoroquinolone type
🔗 Read more from trusted sources
- “Myopathy” on MedlinePlus ↗
US National Library of Medicine
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