Plavix side effects may include stomach pain, runny or stuffy nose, cough, sore throat, or mild headache or dizziness. More serious side effects can require a discussion with your doctor.

Plavix side effects can appear serious so 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 Plavix and call your doctor at once if you have any of these serious side effects: nosebleed or other bleeding that will not stop, black, bloody, or tarry stools, coughing up blood or vomit that looks like coffee grounds, chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling, sudden numbness or weakness, especially on one side of the body, sudden headache, confusion, problems with vision, speech, or balance, or pale skin, easy bruising or bleeding, weakness, fever, and urinating more or less than usual.

Continue taking Plavix and talk to your doctor if you have any of these less serious Plavix side effects: stomach pain, runny or stuffy nose, cough, sore throat, or mild headache or dizziness.

Plavix is used to prevent blood clots after a recent heart attack or stroke, and in people with certain disorders of the heart or blood vessels. Plavix keeps the platelets in your blood from coagulating (clotting) to prevent unwanted blood clots that can occur with certain heart or blood vessel conditions.

Plavix side effects other than those listed here may also occur. Talk to your doctor about any Plavix side effect that seems unusual or that is especially bothersome.

Remember that all medications/drugs can cause gastrointestinal symptoms and can be toxic to your liver.