Do not share this medication with others.
Laboratory and/or medical tests (such as blood cholesterol/triglyceride levels) should be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.
If you are using the liquid form of this medication, take this medication on an empty stomach. Shake the bottle well for at least 20 seconds before each dose. Carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.
The dosage is based on your medical condition, response to treatment, age, and other medications you may be taking. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
The usual maximum dose for this medication is 40 milligrams a day. If you have been instructed by your doctor to take more than 40 milligrams, continue on that same dose. However, promptly talk with him or her about the risks and benefits of your higher dose.
Do not increase your dose or take this medication more often than prescribed. Your condition will not improve any faster, and the risk of serious side effects may be increased.
Avoid eating grapefruit or drinking grapefruit juice while using this medication unless your doctor instructs you otherwise. Grapefruit can increase the amount of this medication in your bloodstream. Consult your doctor or pharmacist for more details.
Take this medication regularly in order to get the most benefit from it. Remember to take it at the same time each day. Keep taking this medication even if you feel well. Most people with high cholesterol or triglycerides do not feel sick.
It is very important to continue to follow your doctor's advice about diet and exercise. It may take up to 4 weeks before you get the full benefit of this drug.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
A very small number of people taking simvastatin may have mild memory problems or confusion. If these rare effects occur, talk to your doctor.
This drug may rarely cause muscle problems (which can rarely lead to very serious conditions called rhabdomyolysis and autoimmune myopathy). Females, older adults, and Chinese people may be at higher risk. Tell your doctor right away if you develop any of these symptoms during treatment and if these symptoms last after your doctor stops this drug: muscle pain/tenderness/weakness (especially with fever or unusual tiredness), signs of kidney problems (such as change in the amount of urine).
This medication may rarely cause liver problems. If you notice any of the following rare but serious side effects, tell your doctor right away: yellowing eyes/skin, dark urine, severe stomach/abdominal pain, persistent nausea/vomiting.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
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.
Older adults may be more sensitive to the side effects of this drug, especially muscle problems.
This medication must not be used during pregnancy. Simvastatin may harm an unborn baby. Therefore, it is important to prevent pregnancy while taking this medication. Consult your doctor for more details and to discuss the use of reliable forms of birth control (such as condoms, birth control pills) while taking this medication. If you become pregnant or think you may be pregnant, tell your doctor right away.
It is unknown if this medication passes into breast milk. Because of the possible risk to the infant, breast-feeding while using this drug is not recommended. Consult your doctor before breast-feeding.
Consult your pharmacist or physician.
See also How to Use section.
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.
Other medications can affect the removal of simvastatin from your body, which may affect how simvastatin works. Examples include certain azole antifungals (such as itraconazole, ketoconazole, posaconazole, voriconazole), boceprevir, cobicistat, colchicine, delavirdine, macrolide antibiotics (such as clarithromycin, erythromycin), nefazodone, HIV protease inhibitors (such as nelfinavir, ritonavir), telaprevir, telithromycin, among others.
Chinese people should not take niacin at doses used to lower cholesterol (1 gram or more) when taking this medication. Doing so may increase the risk of side effects (especially muscle problems). Talk with your doctor for details.
Do not take any red yeast rice products while you are taking simvastatin because some red yeast rice products may also contain a statin called lovastatin. Taking simvastatin and red yeast rice products together can increase your risk of serious muscle and liver problems.
If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.
If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.
Store at room temperature away from light and moisture. Storage temperature ranges differ according to different manufacturers, so consult your pharmacist for more information. Do not refrigerate or freeze. Do not store in the bathroom. Discard the suspension form of this medication one month after opening the bottle, even if there is medication left. Keep all medications away from children and pets.
Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.