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Mevacor Side Effects

Generic name: lovastatin

Medically reviewed by Last updated on Feb 20, 2024.

Note: This document contains side effect information about lovastatin. Some dosage forms listed on this page may not apply to the brand name Mevacor.

Applies to lovastatin: oral tablet, oral tablet extended release.

Serious side effects of Mevacor

Along with its needed effects, lovastatin (the active ingredient contained in Mevacor) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking lovastatin:

Less common

Incidence not known

Other side effects of Mevacor

Some side effects of lovastatin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common

Incidence not known

For Healthcare Professionals

Applies to lovastatin: oral tablet, oral tablet extended release.


Common (1% to 10%): Elevations in liver function tests

Frequency not reported: Hepatitis (including chronic active hepatitis), cholestatic jaundice, fatty change in the liver, cirrhosis, fulminant hepatic necrosis[Ref]

Persistent elevations in liver function tests to three times normal values have been reported in up to 2% of patients on lovastatin in clinical trials. Overall, 1.5% of patients were withdrawn from study due to elevations in serum transaminases. While most patients remained asymptomatic with these elevations, cases of cholestatic jaundice and hepatitis have been reported.

Liver function tests should be closely monitored. Lovastatin should be discontinued in patients with persistent, significant elevations (three times the upper limit of normal) in liver function parameters.[Ref]


Common (1% to 10%): Flatulence, abdominal pain, diarrhea, constipation, nausea

Frequency not reported: Dyspepsia, heartburn, anorexia, vomiting

Postmarketing reports: Abdominal discomfort[Ref]

Gastrointestinal side effects are among the most common complaints in patients on lovastatin. These effects tend to be mild and transient in nature and will often dissipate with continued therapy.[Ref]


Frequency not reported: Elevations in creatine kinase, muscle cramps, myopathy, rhabdomyolysis, arthralgia, myalgia, tendon rupture, dermatomyositis[Ref]

HMG-CoA reductase inhibitors (statins) have been associated with rare cases of severe myopathy and rhabdomyolysis, accompanied by increases in creatine kinase, myoglobinuria, proteinuria, and renal failure. These conditions appear to be dose related, usually occurring with doses greater than 30 mg per day. The incidence and severity of myopathy may be increased by concomitant administration of lovastatin with drugs that can cause myopathy when given alone, such as gemfibrozil and other fibrates, niacin, and potent inhibitors of CYP450 3A4 (i.e., cyclosporine, antifungal azoles, macrolide antibiotics, large amounts of grapefruit juice). Other variables associated with an increased risk of statin-induced myopathy include, advanced age, small body stature, female gender, renal and/or hepatic dysfunction, perioperative periods, hypothyroidism, diabetes mellitus, and alcoholism.

Milder forms of myotoxicity (i.e., myalgia) are commonly reported and occur in approximately 5% to 7% of patients taking a statin drug.

Patients should be instructed to report promptly symptoms of muscle pain, weakness, or tenderness. If such symptoms develop, creatine kinase should be measured, and if markedly elevated, lovastatin should be discontinued. The value of routine monitoring of creatine kinase is not known. In some studies up to 11% of patients experienced elevations in creatine kinase while on lovastatin. In most cases these elevations were mild, transient, and not associated with clinical symptoms.

Itraconazole used concomitantly with lovastatin has led to one reported case of severe rhabdomyolysis in a 63-year-old woman. Caution should be exercised when HMG-CoA reductase inhibitors and azole antifungals are prescribed concurrently.

Exposure to HMG-CoA reductase inhibitors is associated with a decreased risk of bone fractures in persons older than 50.[Ref]


Frequency not reported: Hemolytic anemia, thrombocytopenia, thrombotic thrombocytopenic purpura (TTP), leukopenia (These effects may be manifestations of a hypersensitivity reaction)[Ref]

Nervous system

Common (1% to 10%): Headache, dizziness

Frequency not reported: Cranial nerve dysfunction, tremor, vertigo, memory loss, drowsiness, weight loss, decline in cognitive function, paresthesias, peripheral neuropathy, peripheral nerve palsy

Postmarketing reports: Asthenia, fatigue, malaise, hypoesthesia, insomnia[Ref]


Frequency not reported: Acute renal failure secondary to rhabdomyolysis[Ref]


Frequency not reported: Rash, pruritus, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, photosensitivity, purpura, alopecia (These effects may be manifestations of a hypersensitivity reaction)[Ref]


Frequency not reported: Hypospermia, gynecomastia, thyroid dysfunction, acid maltase deficiency (the genetic disorder also referred to as Pompe's Disease), pancreatitis[Ref]


Frequency not reported: Anaphylaxis, angioedema, lupus erythematous-like syndrome, polymyalgia rheumatic, dermatomyositis, vasculitis, purpura, thrombocytopenia, leukopenia, hemolytic anemia, positive ANA, ESR increase, eosinophilia, arthritis, arthralgia, urticaria, asthenia, photosensitivity, fever (including severe hyperthermia), chills, flushing, malaise, dyspnea, toxic epidermal necrolysis[Ref]


Frequency not reported: Lupus-like syndrome with positive ANA and elevated ESR, polymyalgia rheumatica, vasculitis[Ref]


Frequency not reported: Progression of cataracts, ophthalmoplegia[Ref]


Very rare (less than 0.01%): Hyperkalemia[Ref]


Frequency not reported: Decreased libido, anxiety, insomnia, depression, suicidal thoughts, delusions, paranoia, agitation, nightmares[Ref]


Frequency not reported: Erectile dysfunction, impotence, testicular pain[Ref]

Halkin, et al report a case in which use of both lovastatin and pravastatin on different occasions in the same patient led to reversible impotence. The impotence resolved within 2 weeks after discontinuation of the HMG-CoA reductase inhibitor.[Ref]


Frequency not reported: Tumor growth, hepatocellular carcinomas and adenomas. pulmonary adenomas (all in rodents)[Ref]


Postmarketing reports: Interstitial lung disease

Frequently asked questions


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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.