Last Updated: 2 November 2026
Quick Summary
Muscle pain after starting a new medicine can be caused by several drug classes, including statins, fibrates, some antibiotics and corticosteroids. However, the muscle pain medication itself is not always the cause, so note when symptoms began and speak to your GP or pharmacist before changing anything.
- Statins are the most widely reported cause of muscle aches, though serious muscle injury is low.
- A large review found over 90% of muscle pain reported by statin users was not caused by the treatment.
- Do not stop or change a prescribed medicine without speaking to your prescriber first.
- Keep a symptom diary and list every medicine and supplement you take before your appointment.
- Call 999 or go to A&E for severe weakness, or dark, cola-coloured urine.
Table of Contents
- Which Medicines Can Cause Muscle Pain and Weakness
- Drug-Induced Myopathy: Symptoms, Causes and Recovery
- How Long Medication-Related Muscle Pain Lasts and When It Starts
- What to Do About Muscle Pain from Medication, Including Urgent Warning Signs
- Frequently Asked Questions
Which Medicines Can Cause Muscle Pain and Weakness
Muscle pain after starting a new medicine is common, but it is not always caused by the muscle pain medication itself. A large review of statin trials found that more than 90% of muscle pain reported by people taking statins was not caused by the treatment (University of Oxford study on statins and muscle pain). Timing alone is not proof, so a proper review matters.
Several drug classes are linked to muscle symptoms:
- Statins (atorvastatin, simvastatin, rosuvastatin), used to lower cholesterol. Muscle aches are the most widely reported side effect; serious muscle injury is low but recognised.
- Fibrates (such as fenofibrate), sometimes used with statins, can raise the risk of muscle problems when combined.
- Some antibiotics, particularly fluoroquinolones (e.g. ciprofloxacin) and macrolides, have been associated with tendon and muscle symptoms.
- Corticosteroids taken long-term can contribute to muscle weakness, especially in the legs and shoulders.
- Certain antifungals (such as itraconazole) and some HIV medicines can interact with statins and raise the risk of muscle side effects.
- Colchicine, used for gout, can affect muscle in some circumstances.
- Some blood pressure medicines, including diuretics that lower potassium, can contribute to cramps and weakness.
- Levothyroxine and other thyroid medicines: an incorrect dose can cause muscle aches.
- Bisphosphonates and other bone medicines can occasionally cause muscle or joint pain.
- Interferon and some chemotherapy agents are associated with muscle pain and fatigue.
The list of drugs associated with muscle side effects keeps growing (review of drug-induced myopathies). Risk is often higher with a high starting dose, rapid dose increases, several muscle-affecting medicines taken together, or underlying kidney, liver, or thyroid conditions.
Not every ache after a new prescription is down to the drug. Alternatives include recent infection, changed exercise, injury, dehydration, or an unrelated condition. A pharmacist or GP can help you work through the possibilities rather than assuming the worst, or dismissing it. If you would rather explore options beyond medicines, see why some people look to natural pain relief.
Drug-Induced Myopathy: Symptoms, Causes and Recovery
Drug-induced myopathy means muscle damage or dysfunction caused by a medicine. Symptoms often include aching, tenderness, or weakness in the muscles.
Most people recover once the cause is identified and managed, though this depends on the medicine and the person. Never stop or change a prescribed medicine without talking to your prescriber first.
How Long Medication-Related Muscle Pain Lasts and When It Starts
Any increase in muscle pain linked to statins appears largely during the first year of treatment (Lancet individual-participant meta-analysis on statin therapy). Timing alone does not prove a medicine is the cause, so note when symptoms began and compare them with any recent dose change.
What to Do About Muscle Pain from Medication, Including Urgent Warning Signs
If you notice new muscle pain, tenderness, or weakness after starting or changing a medicine, work through these steps. They keep you safe while you get advice, they do not replace a clinical assessment.
1. Record what you are experiencing. Note when the pain began, which muscles are affected (thighs, calves, shoulders, back), whether it is on one side or both, and whether you have weakness, swelling, or dark urine. You can also read about practical ways to ease muscle aches while you wait for advice. A simple symptom diary is often the most useful thing to bring to an appointment.
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2. List every medicine and supplement you take. Include prescription medicines, over-the-counter painkillers, herbal products, and vitamin or mineral supplements. Interactions are easier to spot when the full list is reviewed together. Reviewing everything together can also help identify supplement-drug interactions that may contribute to muscle pain.
3. Contact your prescriber or a pharmacist before changing anything. A GP, nurse prescriber, or community pharmacist can review your medicines and advise on next steps. Do not stop, reduce, or switch a prescribed medicine on your own, even if you suspect it is the cause, sudden changes can be unsafe for conditions such as high cholesterol, diabetes, or epilepsy.
4. Prepare for the conversation. Mention recent dose changes, new medicines started in the past few months, recent illness, unusually strenuous exercise, or a previous reaction to a medicine. These details help a clinician judge whether the medicine is likely responsible.
5. Ask what will be checked. A clinician may review your medication list, examine the affected muscles, and arrange blood tests. A clinician may consider a blood test for creatine kinase (CK), an enzyme that can rise when muscle is damaged. Other tests may be needed depending on your symptoms and history.
Seek urgent medical help by calling 999 or going to A&E if you have any of the following: (see the guide to severe muscle pain: when to get medical help)
- Severe or rapidly worsening muscle weakness, especially if you cannot lift your arms, climb stairs, or stand up
- Dark, cola-coloured, or tea-coloured urine
- Reduced urination or signs of dehydration
- Muscle pain with a high fever, confusion, or feeling very unwell
- Swelling, stiffness, or pain that spreads quickly
- Chest pain, difficulty breathing, or an irregular heartbeat
For non-emergency advice in the UK, contact your GP surgery, speak to a community pharmacist, or use NHS 111 online or by phone. NHS 111 can help you decide whether you need urgent care, especially outside normal surgery hours.
Watch out: dark urine combined with muscle weakness is a red flag for a serious muscle condition called rhabdomyolysis, which needs emergency assessment, do not wait to see if it settles on its own.
The steps below summarise what to do if new muscle pain appears after starting or changing a medicine.
| Step | What to do | Note |
|---|---|---|
| 1. Record symptoms | Note when pain began, which muscles, and any weakness or dark urine | A symptom diary helps at appointments |
| 2. List medicines | Include prescriptions, painkillers, herbal products and supplements | Interactions are easier to spot together |
| 3. Contact prescriber | Speak to a GP or community pharmacist before changing anything | Do not stop prescribed medicines alone |
| 4. Prepare details | Mention recent dose changes, illness or strenuous exercise | Helps judge whether the medicine is responsible |
| 5. Ask about checks | Clinician may arrange a blood test for creatine kinase (CK) | Other tests depend on symptoms and history |
| Urgent help | Call 999 or go to A&E for severe weakness or dark urine | Dark urine with weakness needs emergency assessment |
Frequently Asked Questions
What medication can make your muscles ache?
Several drug types can cause muscle aches, and statins, the cholesterol-lowering medicines, are the most discussed. Muscle pain is reported with statin therapy, and reports are most common during the first year of treatment. Antibiotics and some other drug classes are also linked to muscle or joint symptoms. The list of drugs associated with muscle side effects keeps growing, so any new prescription is worth checking with your prescriber or pharmacist.
Does drug-induced myopathy go away?
In many cases, muscle symptoms ease after the medicine causing them is reviewed, adjusted or stopped, but recovery depends on the drug and the individual. Do not stop a prescribed medicine on your own, as some conditions need ongoing treatment. Contact your GP or prescriber so they can assess your symptoms, check for underlying causes and decide on a safe next step. Ask whether a blood test for creatine kinase is needed.
When is medication-related muscle pain an emergency?
Seek urgent medical help if muscle pain comes with severe weakness, dark or cola-coloured urine, or marked swelling. These can be signs of rhabdomyolysis, a serious breakdown of muscle tissue. Call 111 in the UK or go to A&E if you have these symptoms. For milder aches that persist, contact your GP or NHS 111 for advice, and keep a note of when the pain started and where it is.
