Lovastatin

Lovastatin, sold under the brand name Mevacor among others, is a statin medication, to treat high blood cholesterol and reduce the risk of cardiovascular disease. Its use is recommended together with lifestyle changes. It is taken by mouth. Common side effects include diarrhea, constipation, headache, muscles pains, rash, and trouble sleeping. Serious side effects may include liver problems, muscle breakdown, and kidney failure. Use during pregnancy may harm the baby and use during breastfeeding is not recommended. It works by decreasing the liver's ability to produce cholesterol by blocking the enzyme HMG-CoA reductase. Lovastatin was patented in 1979 and approved for medical use in 1987. It is on the World Health Organization's List of Essential Medicines. It is available as a generic medication. In 2023, it was the 132nd most commonly prescribed medication in the United States, with more than 4 million prescriptions.

Medical uses The primary uses of lovastatin is for the treatment of dyslipidemia and the prevention of cardiovascular disease. It is recommended to be used only after other measures, such as diet, exercise, and weight reduction, have not improved cholesterol levels.

Side effects Lovastatin is usually well tolerated, with the most common side effects being, in approximately descending order of frequency: creatine phosphokinase elevation, flatulence, abdominal pain, constipation, diarrhoea, muscle aches or pains, nausea, indigestion, weakness, blurred vision, rash, dizziness and muscle cramps. As with all statin drugs, it can occasionally cause myopathy, hepatotoxicity (liver damage), dermatomyositis or rhabdomyolysis. This can be life-threatening if not recognised and treated in time, so any unexplained muscle pain or weakness whilst on lovastatin should be promptly mentioned to the prescribing doctor. Other uncommon side effects that should be promptly mentioned to either the prescribing doctor or an emergency medical service include:

These less serious side effects should still be reported if they persist or increase in severity:

Contraindications Contraindications, conditions that warrant withholding treatment with lovastatin, include pregnancy, breast feeding, and liver disease. Lovastatin is contraindicated during pregnancy (Pregnancy Category X); it may cause birth defects such as skeletal deformities or learning disabilities. Owing to its potential to disrupt infant lipid metabolism, lovastatin should not be taken while breastfeeding. Patients with liver disease should not take lovastatin.

Interactions As with atorvastatin, simvastatin, and other statin drugs metabolized via CYP3A4, drinking grapefruit juice during lovastatin therapy may increase the risk of side effects. Components of grapefruit juice, the flavonoid naringin, or the furanocoumarin bergamottin inhibit CYP3A4 in vitro, and may account for the in vivo effect of grapefruit juice concentrate decreasing the metabolic clearance of lovastatin, and increasing its plasma concentrations.

Mechanism of action Lovastatin is an inhibitor of 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoA reductase), an enzyme that catalyzes the conversion of HMG-CoA to mevalonate. Mevalonate is a required building block for cholesterol biosynthesis and lovastatin interferes with its production by acting as a reversible competitive inhibitor for HMG-CoA, which binds to the HMG-CoA reductase. Lovastatin is a prodrug, an inactive lactone in its native form, the gamma-lactone closed ring form in which it is administered, is hydrolysed in vivo to the β-hydroxy acid open ring form; which is the active form. Lovastatin and other statins have been studied for their chemopreventive and chemotherapeutic effects. No such effects were seen in the early studies. More recent investigations revealed some chemopreventive and therapeutic effects, for certain types of cancer, especially in combination of statins with other anticancer drugs. It is likely that these effect are mediated by the properties of statins to reduce proteasome activity, leading to an accumulation of cyclin-dependent kinase inhibitors p21 and p27, and to subsequent G1-phase arrest, as seen in cells of different cancer lines.

History

Compactin and lovastatin, natural products with a powerful inhibitory effect on HMG-CoA reductase, were discovered in the 1970s, and taken into clinical development as potential drugs for lowering LDL cholesterol. In 1982, some small-scale clinical investigations of lovastatin, a polyketide-derived natural product isolated from Aspergillus terreus, in very high-risk patients were undertaken, in which dramatic reductions in LDL cholesterol were observed, with very few adverse effects. After the additional animal safety studies with lovastatin revealed no toxicity of the type thought to be associated with compactin, clinical studies continued. Large-scale trials confirmed the effectiveness of lovastatin. Observed tolerability continued to be excellent, and lovastatin was approved by the US FDA in 1987. It was the first statin approved by the FDA. Lovastatin is also naturally produced by certain higher fungi, such as Pleurotus ostreatus (oyster mushroom) and closely related Pleurotus spp. Research into the effect of oyster mushroom and its extracts on the cholesterol levels of laboratory animals has been extensive, although the effect has been demonstrated in a very limited number of human subjects. In 1998, the FDA placed a ban on the sale of dietary supplements derived from red yeast rice, which naturally contains lovastatin, arguing that products containing prescription agents require drug approval. Judge Dale A. Kimball of the United States District Court for the District of Utah, granted a motion by Cholestin's manufacturer, Pharmanex, that the agency's ban was illegal under the 1994 Dietary Supplement Health and Education Act because the product was marketed as a dietary supplement, not a drug.

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