Possible side effects of antiplatelet medication include:

Adjusting when antiplatelets are taking may help reduce some side effects. For example, if the drug is taken after meals rather than on an empty stomach, it may reduce upset stomach and nausea. Patients are urged to contact their physician if they experience the side effects are severe, become worse or do not go away.

In addition, patients should contact their physician immediately if the experience:

• Unusual heavy bleeding (e.g., from a cut, during menstruation)
  
  
• Dark red or black, tarry stools
  
  
• Vomiting that looks like coffee grounds
  
  
• Coughing up blood
  
  
• Unusual bruising
  
  
• Feeling faint, dizzy or disoriented
  
  
• Ringing in the ears
  
  
• Chest pain or tightness in the chest
  
  
• Difficulty breathing
  
  
• Swallowing problems