ZOCOR (simvastatin) is a lipid-lowering agent that is derived synthetically
from a fermentation product of Aspergillus terreus. After oral ingestion,
simvastatin, which is an inactive lactone, is hydrolyzed to the corresponding
β-hydroxyacid form. This is an inhibitor of 3-hydroxy-3-methylglutaryl-coenzyme
A (HMG-CoA) reductase. This enzyme catalyzes the conversion of HMG-CoA to mevalonate,
which is an early and rate-limiting step in the biosynthesis of cholesterol.
Simvastatin is butanoic acid, 2,2-dimethyl-,1,2,3,7,8,8a-hexahydro-3,7-dimethyl-8-[2-(tetrahydro-4hydroxy-6-oxo-2H-pyran-2-yl)-ethyl]-1-naphthalenyl
ester, [1S-[1α,3α,7β,8β(2S*,4S*),-8aβ]]. The empirical
formula of simvastatin is C25H38O5 and its
molecular weight is 418.57. Its structural formula is:
Simvastatin is a white to off-white, nonhygroscopic, crystalline powder that
is practically insoluble in water, and freely soluble in chloroform, methanol
and ethanol.
Tablets ZOCOR for oral administration contain either 5 mg, 10mg, 20 mg, 40
mg or 80 mg of Simvastatin and the following inactive ingredients: ascorbic
acid, citric acid, hydroxypropyl cellulose, hypromellose, iron oxides, lactose,
magnesium stearate, microcrystalline cellulose, starch, talc, and titanium dioxide.
Butylated hydroxyanisole is added as a preservative.
3 Manson, J.M., Freyssinges, C., Ducrocq, M.B., Stephenson, W.P., Postmarketing
Surveillance of Lovastatin and Simvastatin Exposure During Pregnancy, Reproductive
Toxicology, 10(6):439-446, 1996.
What are the possible side effects of simvastatin (Zocor)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using simvastatin and call your doctor at once if you have any of these serious side effects:
- muscle pain, tenderness, or weakness with fever or flu symptoms and dark colored urine.
Less serious side effects may include:
- mild stomach pain, gas, bloating, stomach upset, heartburn;
- nausea;
- constipation;...
Read All Potential Side Effects and See Pictures of Zocor »
What are the precautions when taking simvastatin (Zocor)?
Before taking simvastatin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver disease, kidney disease, alcohol use.
Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
Limit alcoholic beverages. Daily use of alcohol may increase your risk for liver problems, especially when combined with simvastatin. Ask your doctor or pharmacist for more information.
Older adults may be...
Read All Potential Precautions of Zocor »
Last reviewed on RxList: 10/24/2011
This monograph has been modified to include the generic and brand name in many instances.