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  • Title: Interactions with hydroxymethylglutaryl-coenzyme A reductase inhibitors.
    Author: Garnett WR.
    Journal: Am J Health Syst Pharm; 1995 Aug 01; 52(15):1639-45. PubMed ID: 7583826.
    Abstract:
    Drug-drug, drug-food, and drug-disease interactions involving hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors are reviewed. The four available HMG-CoA reductase inhibitors-lovastatin, simvastatin, pravastatin, and fluvastatin-have different potentials for drug interactions, probably because of their different pharmacokinetic characteristics. Interactions of some of these cholesterol-lowering agents with cyclosporine, erythromycin, high-dose niacin, or gemfibrozil may produce myopathy with or without rhabdomyolysis. Interactions with other commonly prescribed agents, such as bile acid sequestrants, coumarin anticoagulants, and cardiovascular drugs, may alter the pharmacokinetics of either drug, but the clinical significance is generally minor. Food may affect plasma lovastatin concentrations, systemic pravastatin bioavailability, and the maximum serum concentration (Cmax) and time to achieve Cmax for fluvastatin. Hepatic dysfunction may influence the pharmacokinetics of pravastatin; all HMG-CoA reductase inhibitors are contraindicated in patients with liver disease or unexplained elevations in serum aminotransferases. Severe renal insufficiency may necessitate dosage modification in lovastatin recipients. Renal dysfunction seems to affect the pharmacokinetics of pravastatin, simvastatin, and fluvastatin only minimally, but caution is still warranted. Although the HMG-CoA reductase inhibitors rarely have severe adverse effects, they may interact, in some cases dangerously, with other drugs, with food, and with disease states.
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