Read the Medication Guide provided by your pharmacist before you start taking clopidogrel and each time you get a refill. If you have any questions, ask your doctor or pharmacist.
Take this medication by mouth with or without food as directed by your doctor, usually once daily. Take this medication regularly to get the most benefit from it. To help you remember, take it at the same time each day.
The dosage and length of treatment are based on your medical condition and response to treatment. If you are taking this medication to prevent clots after a stent implant or other procedure, take this medication with aspirin for many months to years after the procedure (depending on the procedure/type of stent) as directed by your doctor. Consult your doctor for more details and about the risks of stopping early. Keep taking this medication even if you feel well. Do not stop taking this medication without consulting your doctor.
Avoid eating grapefruit or drinking grapefruit juice while using this medication unless your doctor or pharmacist says you may do so safely. Grapefruit can increase the chance of side effects with this medicine. Ask your doctor or pharmacist for more details.
Get medical help right away if you have any signs that this medication is not working, such as symptoms of a new heart attack or stroke (such as chest/jaw/left arm pain, shortness of breath, unusual sweating, weakness on one side of the body, trouble speaking, sudden vision changes, confusion).
Easy bleeding/bruising, stomach upset/pain, diarrhea, and constipation may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
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.
Although unlikely, serious bleeding in the stomach, gut, eyes, or brain may occur. Also, clopidogrel can rarely cause a very serious blood disorder (thrombotic thrombocytopenic purpura-TTP). Symptoms may appear any time after starting this medication. Get medical help right away if any of these symptoms occur: severe stomach/abdominal pain, uncontrolled bleeding from gums or nose, bloody/black stools, confusion, fever, extreme skin paleness, purple skin patches, fainting, fast heartbeat, sudden severe headache, unusual weakness/tiredness, vomit with blood or that looks like coffee grounds, trouble speaking, vision changes, seizures, yellowing eyes/skin, bloody/red/pink/dark urine, signs of kidney problems (such as change in the amount of urine).
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.