--Dicyclomine: Dry mouth, blurred vision, nausea, dizziness, drowsiness, weakness, nervousness, bloating. Mefenamic Acid: Nausea, vomiting, upset stomach, heartburn, diarrhea, constipation, drowsiness, dizziness. Serious side effects may include: chest/jaw/left arm pain, shortness of breath, unusual sweating, confusion, weakness on one side of the body, slurred speech, sudden vision changes.