Victor Forge
Drugs are often prescribed to manage or prevent symptoms and diseases, but they can sometimes have unintended toxic effects on muscles, known as drug-induced myopathies. This can cause muscle pain, weakness, inflammation, stiffness, spasms, and cramps. There are many medications that can cause muscle wasting, including statins, fibrates, antiarrhythmic medicines, corticosteroids, antiretrovirals, and chemotherapy agents. In some cases, muscle weakness may be caused by medication side effects, and a doctor may recommend lowering the dose, switching to another medication, or discontinuing treatment.
| Characteristics | Values |
|---|---|
| Drugs that cause muscle wasting | Statins, fibrates, alcohol, zidovudine, tenofovir, clevudine, D-penicillamine, antiretrovirals, vincristine, cyclosporine, nivolumab, pembrolizumab, atezolizumab, lamotrigine, phenytoin, omeprazole, beta-blockers, labetalol, diuretics, blood pressure medications, antiarrhythmic medicines, corticosteroids, hypolipemic drugs, glucocorticosteroids, antimalarials, colchicine, checkpoint inhibitors |
| Symptoms | Muscle weakness, pain, inflammation, stiffness, spasms, cramps, hypokalemia, low potassium levels, fatigue |
| Diseases associated with muscle wasting | Sarcopenia, cachexia, myopathy, myalgia, myositis, rhabdomyolysis, cancer, HIV, Wilson's disease, anaemia, viral infections, diabetes |
| Drugs used to treat muscle wasting | Formoterol, oxypurinol, allopurinol |
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What You'll Learn
Medication and muscle toxicity
While drugs are prescribed to manage or prevent symptoms and diseases, they may sometimes cause unexpected toxicity to muscles. This is known as drug-induced myotoxicity. The symptomatology and clinical manifestations of the myotoxic reaction can vary significantly between drugs and between patients taking the same drug. This poses a challenge to recognizing and preventing drug-induced muscle toxicity. The key to appropriate management is the prompt recognition that symptoms may be drug-related and awareness of inter-individual differences in susceptibility to drug-induced toxicity.
The most prevalent and well-documented drug class with unintended myotoxicity is the statins. However, new classes of drugs with unintended myotoxicity are being discovered, such as tyrosine kinase inhibitors and immune checkpoint inhibitors. The actual incidence of drug-induced myotoxicity remains unclear, partly because the clinical manifestations can vary significantly between patients and are not necessarily related to a single agent. It is highly likely that the true incidence of these adverse events is underestimated by clinical trials.
There are several pathogenic mechanisms by which drugs can cause muscle toxicity. These include the suppression of myoblast differentiation, increased muscle protein catabolism via increased atrogin mRNA expression in myotubes, and the induction of mitochondrial dysfunction. Inflammation is believed to be a major factor in skeletal muscle wasting, as the response of skeletal muscle to various inflammatory cytokines induces muscle atrophy.
Some specific drugs that have been associated with muscle toxicity include Zidovudine, an antiviral medication, which has been linked to myopathy and muscle weakness in patients with HIV. D-penicillamine, a former antirheumatic drug, can cause inflammatory myopathy, with symptoms including myalgia, muscle weakness, and dysphagia in about half of the patients. Additionally, certain oral drugs commonly prescribed to older adults, such as angiotensin-converting enzyme inhibitors, antidiabetic drugs, and vitamin D, have been linked to muscle wasting and sarcopenia.
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Drug-induced myopathy
Drugs that are frequently associated with adverse muscular effects include hypolipemic drugs, beta-blockers, amiodarone, colchicine, glucocorticosteroids, antimalarials, cyclosporine, zidovudine, and checkpoint inhibitors. Zidovudine-induced myopathy, for example, is perceived as wasting and weakness of proximal muscles and sometimes myalgia. It is often observed in HIV patients who have been taking long-term antiviral medications. Another example is D-penicillamine, an antirheumatic drug that can cause inflammatory myopathy, leading to myalgia, muscle weakness, and dysphagia in about half of the patients.
Drug-induced myopathies are of great clinical importance as they can significantly reduce a patient's quality of life. They are often overlooked, resulting in misdiagnosis and improper care. Therefore, it is crucial for clinicians to recognise toxic myopathies early in their course to determine when to discontinue therapy and prevent irreversible muscle damage.
Widely prescribed drugs can also play a role in the onset and development of sarcopenia, a geriatric syndrome characterised by progressive and generalised loss of skeletal muscle mass and function. Oral drugs, in particular, may interact with mechanisms that alter the balance between protein synthesis and degradation, potentially contributing to muscle wasting.
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Medication and muscle pain
Medication can indeed cause muscle pain and wasting. This can occur due to a variety of factors, including the medication type, dosage, and individual response.
Statins
Statins are a common medication for lowering cholesterol and reducing the risk of heart attack and stroke. However, they are known to cause muscle pain and inflammation in some individuals. Lowering the dosage or switching to a different type of statin can often alleviate this issue.
Bisphosphonates
Bisphosphonates are medications used to treat osteoporosis, a condition that weakens bones. A common side effect of these drugs is mild to moderate muscle pain, which may be experienced in combination with bone or joint pain. For severe pain, patients are advised to stop taking the medication and consult their doctor.
Pregabalin
Pregabalin is an anticonvulsant drug used to treat epileptic seizures and nerve pain. It has a range of side effects, including muscle and joint pain. Alternative nerve medications, such as gabapentin, are available that do not typically cause these issues.
Antivirals
Long-term use of antiviral medications has been linked to muscle wasting and weakness, particularly in patients with HIV. Zidovudine, for example, can cause myopathy and proximal muscle weakness. Other antiviral drugs, such as tenofovir and clevudine, have also been associated with myopathy.
D-penicillamine
D-penicillamine, once used as an antirheumatic drug, can cause inflammatory myopathy, resulting in muscle weakness and pain.
It is important to consult a doctor before starting, stopping, or modifying the dosage of any medication. Additionally, pain management physicians should be informed of all medications a patient is taking to ensure optimal care and avoid exacerbating chronic pain.
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Muscle wasting and sarcopenia
The causes of sarcopenia are multifactorial and can include genetic influence, immobility or disuse, endocrine factors, inflammation, and nutritional deficiencies. Inactivity is a major risk factor for sarcopenia, as muscle strength decreases with lack of use, resulting in greater fatigue and making it more difficult to return to normal activity. This can be due to a sedentary lifestyle, bed rest, or immobilisation after an injury or illness. Poor diet also contributes to sarcopenia, with diets low in fruits and vegetables and high in ultra-processed foods linked to low muscle mass. Obesity and fat infiltration into skeletal muscle, known as sarcopenic obesity, also play an important role in sarcopenia.
Certain medications have also been associated with muscle wasting and sarcopenia. For example, D-penicillamine, an antirheumatic drug, can cause inflammatory myopathy, leading to muscle weakness and myalgia. Long-term use of antiviral medications in patients with HIV has been linked to an increased risk of sarcopenia. Additionally, oral drugs commonly prescribed to older adults, such as angiotensin-converting enzyme inhibitors, statins, and antidiabetic drugs, may also contribute to sarcopenia and muscle wasting.
The treatment and management of sarcopenia focus on improving nutrition and increasing physical activity. Adequate nutrition, including sufficient calories, protein, and certain vitamins and minerals, is crucial for muscle health. Resistance exercises, such as sit-ups, push-ups, and using resistance bands, can help increase muscle mass and prevent muscle loss. Additionally, sustained aerobic exercise that raises the heart rate can also control sarcopenia. Pharmaceutical agents targeting multiple biological pathways are being developed, but adequate nutrition and targeted exercise remain the gold standard for therapy.
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Medication side effects and muscle weakness
Medication can cause muscle wasting and weakness, a condition known as drug-induced myopathy. Myopathy is a muscle disease with symptoms such as muscle weakness, pain, inflammation, stiffness, spasms, and cramps. Drug-induced myopathy is often associated with cholesterol-lowering drugs, antiarrhythmic medicines, corticosteroids, and statins.
Cholesterol-lowering drugs such as statins (e.g., simvastatin and atorvastatin) and fibrates (e.g., fenofibrate and gemfibrozil) can cause necrotizing myopathy, which is characterised by the death of muscle fibres. Statins may also lead to a rare but serious condition called rhabdomyolysis, where muscle tissue breaks down rapidly.
Antiarrhythmic medicines used to treat heart rhythm problems, such as amiodarone and procainamide, can also cause drug-induced myopathy. Corticosteroids like prednisone, especially when taken at high doses or for prolonged periods, can lead to muscle weakness and pain.
In addition, antiretroviral drugs used to treat HIV, such as zidovudine, can cause mitochondrial myopathies by affecting the genetic material in muscle cells. This results in muscle weakness and wasting. D-penicillamine, once used as an antirheumatic drug, can also cause inflammatory myopathy, leading to muscle weakness and pain.
It is important to note that not everyone who takes these medications will develop myopathy or experience muscle weakness. However, if you experience muscle pain and weakness after starting a new medication, it is advisable to consult your doctor to discuss your symptoms, their potential causes, and possible adjustments to your medication or lifestyle.
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Frequently asked questions
Muscle wasting, also known as sarcopenia, is a geriatric syndrome characterised by a progressive and generalised loss of skeletal muscle mass and function.
Yes, certain medications can cause muscle wasting or sarcopenia. This is known as drug-induced myopathy and is a common cause of muscle pain.
Some medications that have been linked to muscle wasting include statins, fibrates, cholesterol-lowering drugs, antiarrhythmic medicines, corticosteroids, antiretrovirals, and chemotherapy agents.
Symptoms of drug-induced myopathy can include muscle weakness, pain, inflammation, stiffness, spasms, and cramps. These symptoms can range from mild to severe.
If you experience muscle wasting or any other concerning side effects while taking medication, you should speak to your doctor. They may recommend adjusting the dose, switching to another medication, or discontinuing treatment.
