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February 10, 2012

ezetimibe and simvastatin, Vytorin (cont.)

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Simvastatin increases the effect of warfarin (Coumadin) and the blood concentration of digoxin (Lanoxin). Patients taking simvastatin and warfarin or digoxin should be monitored carefully.

Cholestyramine (Questran) decreases the absorption of ezetimibe (Zetia). Administer Vytorin 2 hours before or at least 4 hours after cholestyramine administration.

PREGNANCY: Vytorin should not be taken during pregnancy because the developing fetus requires cholesterol for development and Vytorin, due to the simvastatin component, reduces the production of cholesterol. Vytorin should only be administered to women of child bearing age if they are not likely to become pregnant.

NURSING MOTHERS: Because of the risk of adverse effects to the developing infant, Vytorin should not be administered to nursing mothers.

SIDE EFFECTS: The most common side effects of Vytorin are headache, nausea, vomiting, diarrhea, muscle pain, and abnormal liver tests. Hypersensitivity reactions have also been reported. The most serious potential side effects are liver damage and muscle inflammation or breakdown.

The simvastatin component of Vytorin is a statin. Therefore it shares side effects, such as liver and muscle damage associated with statins. Serious liver damage caused by statins is rare. More often, statins cause abnormalities of liver tests, and, therefore, periodic measurement of liver tests in the blood is recommended for all statins. Abnormal tests usually return to normal even if a statin is continued, but if the abnormal test value is greater than three times the upper limit of normal, the statin usually is stopped. Liver tests should be measured before Vytorin is started and periodically thereafter or if there is a medical concern about liver damage. Liver tests should be performed before the 10/80 mg dose of Vytorin is initiated, three months after initiation and then periodically thereafter.

Inflammation of the muscles caused by statins can lead to a serious breakdown of muscle cells called rhabdomyolysis. Rhabdomyolysis causes the release of muscle protein (myoglobin) into the blood. Myoglobin can cause kidney failure and even death. When used alone, statins cause rhabdomyolysis in less than one percent of patients. To prevent the development of rhabdomyolysis, patients taking Vytorin should contact their healthcare provider immediately if they develop unexplained muscle pain, weakness, or muscle tenderness.

Reference: FDA Prescribing Information


Last Editorial Review: 4/16/2008



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