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Muscle weakness can be caused by a variety of factors, including chronic conditions, infections, and medications. While muscle weakness is often a symptom of underlying health issues, certain drugs can induce myopathies, resulting in muscle-related side effects such as pain, weakness, and even rhabdomyolysis. Statins, fibrates, corticosteroids, and beta-blockers are among the medications that have been linked to muscle weakness. It is important to consult a doctor if you experience muscle weakness to determine the underlying cause and explore appropriate treatment options.
| Characteristics | Values |
|---|---|
| Types of medication causing muscle weakness | Statins, fibrates, antiarrhythmic medicines, corticosteroids, immune checkpoint inhibitors, immunosuppressive agents, antiretrovirals, chemotherapy agents, tumour necrosis factor-alpha inhibitors, D-penicillamine, antiepileptic drugs, omeprazole, beta-blockers, diuretics, blood pressure medications, colchicine, ACE inhibitors, aromatase inhibitors |
| Types of muscle weakness | Drug-induced myopathy, necrotizing myopathy, inflammatory myopathy, mitochondrial myopathy, hypokalemia or low potassium levels, fatigue, myasthenia gravis, secondary hyperparathyroidism, Becker muscular dystrophy, systemic lupus erythematosus, sleep disorders, lack of use, metabolic waste buildup, neurological conditions, chronic illnesses, sarcopenia |
| Muscle weakness symptoms | Muscle pain, inflammation, stiffness, spasms, cramps, exercise intolerance, rhabdomyolysis, myositis, twitching, difficulty breathing, skin rash, dizziness, fever, nausea, vomiting, loss of appetite, sore throat, cough, joint pain, sweating, weight loss, agitation, confusion |
| Muscle weakness actions | Consult a doctor, do not stop taking medication without medical advice, lower dose, switch medication, discontinue treatment, consider lifestyle changes |
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What You'll Learn
Statins and fibrates
The risk of myopathy increases when statins and fibrates are used in combination. This risk was first observed with the combination of gemfibrozil and lovastatin and became more prominent when gemfibrozil was combined with cerivastatin, leading to the latter agent being withdrawn from the market. When initiating this combination, it is recommended to start with a low dose and then adjust as needed.
If you experience muscle weakness, especially if accompanied by other symptoms such as difficulty breathing, skin rash, dizziness, or nausea, it is important to consult your doctor. They may recommend lowering the dose, switching to an alternative medication, or discontinuing treatment.
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Antiarrhythmic medicines
Antiarrhythmic medications are used to prevent and treat a heart rhythm that is too fast or irregular, also known as arrhythmias. Arrhythmia involves a problem with the heart's electrical system, causing the heart to beat too quickly, too slowly, or erratically. Antiarrhythmics treat abnormal heart rhythms, including atrial fibrillation, atrial flutter, ventricular tachycardia, and ventricular fibrillation. They can reset your heart to a normal rhythm or prevent episodes of arrhythmia.
These medications act on the heart's various electrical channels to stop irregular, extra electrical impulses and prevent abnormally fast electrical impulses from traveling along heart tissues. They are typically categorized according to the Vaughan-Williams (VW) classification system, which includes four main categories, with some references adding a fifth. The VW classification breaks down as follows:
Class I: Sodium Channel Blockers
These drugs prevent sodium from getting through cell membranes, slowing electrical impulses in the heart muscle. Examples include disopyramide, flecainide, mexiletine, propafenone, and quinidine.
Class II: Beta Blockers
These drugs slow down the heart rate, often by blocking hormones such as adrenaline. Examples include acebutolol, atenolol, bisoprolol, metoprolol, nadolol, and propranolol. Beta-blockers are among the cardiovascular drugs that can cause muscular symptoms, with muscle cramps or weakness listed as undesirable effects.
Class III: Potassium Channel Blockers
These drugs prevent potassium from getting through cell membranes, slowing electrical impulses in all of the heart's cells. Examples include amiodarone, bretylium, dofetilide, dronedarone, ibutilide, and sotalol. Amiodarone and procainamide are antiarrhythmic medications that have been linked to drug-induced myopathy or muscle disease, which can cause muscle weakness.
Class IV: Nondihydropyridine Calcium Channel Blockers
These drugs block calcium channels in the heart muscle.
If you are taking an antiarrhythmic, it is important to be monitored carefully by healthcare providers, who can adjust your dose or recommend a different medicine if you experience new or worsening arrhythmia symptoms. If you experience muscle weakness, especially if accompanied by other symptoms, you should speak to your doctor. They can diagnose the underlying cause and recommend appropriate treatment.
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Corticosteroids
Corticosteroid-induced myopathy is a toxic non-inflammatory condition that affects the muscles. It occurs when there is an excess of corticosteroids in the body, which can be due to endogenous (produced by the body) or exogenous (administered as medication) sources. Endogenous excess corticosteroid production can arise from adrenal tumors, while exogenous excess is often a result of prolonged oral or intravenous glucocorticoid use, typically at higher doses.
The exact incidence of corticosteroid-induced myopathy is unknown, but it is believed to be more common in older individuals, males, and obese patients. The condition usually affects the proximal muscles of the upper and lower limbs and the neck flexors. It is characterized by muscle weakness and atrophy without associated pain. In some cases, muscle biopsy may reveal atrophy of type 2b fast-twitch muscle fibers.
Treatment for corticosteroid-induced myopathy typically involves tapering or discontinuing the use of corticosteroids. Within 3 to 4 weeks of reducing the dosage, patients may experience improvement in their muscle weakness, although full recovery can take months to a year. Physical therapy, including resistance and aerobic exercises, has also been shown to be beneficial in preventing and treating corticosteroid-induced myopathy.
It is important to note that not everyone who takes corticosteroids will experience muscle weakness. However, if you are taking these medications and experience any side effects, including muscle weakness, you should consult your doctor. They may recommend adjusting the dosage or switching to alternative medications.
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Antiretrovirals
Mitochondrial toxicity is a side effect of nucleoside reverse transcriptase inhibitors (NRTIs), a type of antiretroviral. NRTIs can cause a buildup of lactic acid, which can lead to muscle aches and, in some cases, liver failure. This is uncommon, but it can be life-threatening if not addressed. Doctors will usually change medications if a patient shows signs of mitochondrial toxicity.
Antiretroviral therapy (ART) initiation has been associated with an increased skeletal muscle area and fat content. This may be due to the drug's impact on muscle density, with less dense muscle containing more fat. Research has shown that, from baseline to week 96 of ART, overall muscle density decreased significantly, with the greatest differences seen in the rectus muscle, followed by the oblique/transverse abdominal, spinalis, and psoas muscles.
The impact of ART on muscle quality is particularly important for HIV-infected older adults, who are already at an increased risk for frailty and physical function impairment compared to HIV-uninfected adults of similar ages. As people age, they naturally lose muscle mass and strength, and ART may exacerbate this process.
It is important to note that not everyone who takes antiretrovirals will experience muscle weakness. If you are experiencing muscle weakness or other side effects, speak to your doctor. They may recommend lowering the dose, switching to another medication, or discontinuing treatment. Do not stop taking your medication without consulting your doctor first.
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Beta-blockers
It is worth noting that muscle weakness is not a common adverse effect of blood pressure medications, including beta-blockers. However, there have been case reports of muscle pain related to labetalol use.
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Frequently asked questions
Statins, fibrates, beta-blockers, corticosteroids, antiretrovirals, and antiarrhythmic medicines are some of the medications that can cause muscle weakness.
Symptoms of drug-induced myopathy can include muscle weakness, pain, inflammation, stiffness, spasms, and cramps.
If you experience muscle weakness as a side effect of medication, you should speak to your doctor. They may recommend adjusting the dosage, switching to an alternative medication, or discontinuing the treatment.
