Instructed ALF's staff in new medication of Clopidogrel ( Plavix ) to reduce atherosclerotic events. In addition, warned of possible side effects such as headache, dizziness, fatigue, depression, pain, edema, hypertension, rhinitis, epistaxis, abdominal pain, gastritis, constipation, diarrhea, ulcers, arthralgia, coughing, rash, pruritus and others. VITAMIN C Patient was instructed in new medication Vitamin C side effects such as; nausea, vomiting, heartburn, abdominal cramps, and headache. Dental erosion may occur from chronically chewing vitamin C tablets.