Gastrointestinal discomfort, diarrhea or gas constipation, nausea, vomiting, drowsiness and dizziness have been observed. Signs of hemolytic anemia should be watched in cases when the drug is taken on prolonged period of time. As in all inhibitors of prostaglandin synthesis, Mefenamic Acid can affect platelet function. In large doses the drug may induce Grand Mal convulsions hence it is suggested to avoid this in epileptics.