Zocor, atorvastatin, cerivastatin, fluvastatin, lovastatin, pravastatin, and simvastatin are used to lower levels of cholesterol and other fats in the blood. This may help prevent medical problems caused by cholesterol clogging the blood vessels.

These medicines belong to the group of medicines called 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors. They work by blocking an enzyme that is needed by the body to make cholesterol. Thus, less cholesterol is made.

HMG-CoA reductase inhibitors are available only with your doctor's prescription, in the following dosage forms:

Oral
• Atorvastatin
  • Tablets (U.S. and Canada)
• Cerivastatin
  • Tablets #
• Fluvastatin
  • Capsules (U.S. and Canada)
• Lovastatin
  • Extended-Release Tablets (U.S.)
  • Tablets (U.S. and Canada)
• Pravastatin
  • Tablets (U.S. and Canada)
• Simvastatin
  • Tablets (U.S. and Canada)

In deciding to use Zocor, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For HMG-CoA reductase inhibitors, the following should be considered:

Allergies-Tell your doctor if you have ever had any unusual or allergic reaction to HMG-CoA reductase inhibitors. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.

Diet-Before prescribing medicines to lower your cholesterol, your doctor will probably try to control your condition by prescribing a personal diet for you. Such a diet will be lower in total fat, particularly saturated fat, and dietary cholesterol. Many people are able to control their condition by carefully following their doctor's orders for proper diet and exercise. Zocor is prescribed only when additional help is needed and is effective only when a schedule of diet and exercise is properly followed.

Also, Zocor is less effective if you are greatly overweight. It may be very important for you to go on a reducing diet. However, check with your doctor before going on any diet.

Pregnancy-HMG-CoA reductase inhibitors should not be used during pregnancy or by women who plan to become pregnant in the near future. Zocor and similar medicines block formation of cholesterol, which is necessary for the fetus to develop properly. HMG-CoA reductase inhibitors may cause birth defects or other problems in the baby if taken during pregnancy. An effective form of birth control should be used during treatment with these medicines. Check with your doctor immediately if you think you have become pregnant while taking Zocor. Be sure you have discussed this with your doctor.

Breast-feeding-Zocor is not recommended for use during breast-feeding because they may cause unwanted effects in nursing babies.

Children-Studies on Zocor have been done only in adult patients, and there is no specific information comparing use of HMG-CoA reductase inhibitors in children with use in other age groups. However, atorvastatin, lovastatin, and simvastatin have been used in a limited number of children under 18 years of age. Early information seems to show that these medicines may be effective in children, but their long-term safety has not been studied.

Older adults-Zocor has been tested in a limited number of patients 65 years of age or older and has not been shown to cause different side effects or problems in older people than it does in younger adults.

Other medicines-Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking HMG-CoA reductase inhibitors such as Zocor, it is especially important that your health care professional know if you are taking any of the following:

• Cyclosporine (e.g., Sandimmune) or
• Gemfibrozil (e.g., Lopid) or
• Clofibrate (e.g., Atromid-S) or
• Fenofibrate (e.g., Tricor) or
• Niacin-Use of these medicines with an HMG-CoA reductase inhibitor may increase the risk of developing muscle problems and kidney failure

• Digoxin (e.g., Lanoxin)-Use with atorvastatin, fluvastatin, or simvastatin may increase blood levels of digoxin, increasing the risk of side effects

• Oral contraceptives, (birth control tablets)-Atorvastatin may increase the blood levels of the birth control hormones, increasing the risk of side effects

• HIV protease inhibitors (Amprenavir [e.g., Agenerase], Indinavir [e.g., Crixivan], Nelfinavir [e.g., Viracept], Ritonavir [e.g., Norvir], Saquinavir [e.g., Fortovase, Invirase]) or
• Nefazodone (e.g. Serzone)-Use with simvastatin may increase the risk of developing muscle problems and kidney failure

• Verapamil (e.g. Calan, Isoptin)-Use with simvastatin may increase the risk of muscle problems

Other medical problems-The presence of other medical problems may affect the use of HMG-CoA reductase inhibitors. Make sure you tell your doctor if you have any other medical problems, especially:

• Alcohol abuse (or history of) or
• Liver disease-Use of Zocor may make liver problems worse

• Convulsions (seizures), not well-controlled, or
• Organ transplant with therapy to prevent transplant rejection or
• If you have recently had major surgery-Patients with these conditions may be at risk of developing problems that may lead to kidney failure