Common side effects of Pradaxa include stomach pain, upset stomach, indigestion and nausea, according to MedlinePlus. Serious side effects of Pradaxa, or dabigatran, include abnormal bruising or bleeding, pink or brown urine, red or black stools, vomit that contains blood or looks like coffee grounds, and bleeding from the gums.
Headache, dizziness, weakness, and joint pain or swelling are other serious side effects of Pradaxa that require an immediate call to a doctor, notes MedlinePlus. Frequent nosebleeds, heavy menstrual bleeding and coughing up blood while taking Pradaxa also signal a serious problem. Some people experience symptoms of an allergic reaction to Pradaxa, including hives, rash, itching, problems breathing and swelling of the face or tongue, explains the Pradaxa website. Individuals experiencing symptoms of an allergic reaction require emergency medical attention.
Pradaxa is an anticoagulant that treats and prevents blood clots in the veins and the lungs, states MedlinePlus. It also prevents strokes and blood clots in patients who have an irregular heart rhythm called atrial fibrillation. Patients typically take Pradaxa twice a day, with or without food. The medication, which comes in a capsule form, must be swallowed whole with a glass of water. Patients may not crush, chew, split or break open the capsules.