Medicine Name: Pin OM-M 25 Tablet ER. Composition: Olmesartan Medoxomil (20mg) + Metoprolol Succinate (25mg). Side Effects: Nausea Diarrhea Constipation Upset stomach Taste change Weakness Dizziness Headache Cold extremities Numbness of extremity Increased potassium level in blood Slow heart rate Decreased blood pressure.