Normictal 400mg Tablet is a prescription medicine used to treat epilepsy (seizures). It helps to decrease the abnormal and excessive activity of the nerve cells and calms the brain. Normictal 400mg Tablet may be taken with or without food, preferably at the same time, each day. Take this medicine in the dose and duration as advised by your doctor. If you have missed a dose, take it as soon as you remember it. Do not skip any doses and finish the full course of treatment even if you feel better. Do not stop taking it abruptly without discussing it with your doctor, as it may increase seizure frequency. Some of the common side effects of this medicine include blurred or double vision, headache, nausea, vomiting, fatigue, and diarrhea. It may also cause dizziness and sleepiness, do not drive or do anything that requires mental focus until you know how this medicine affects you. Please consult your doctor if these side effects bother you or do not go away. Your doctor may advise for regular monitoring of sodium levels, as it may reduce the sodium levels in your blood (hyponatremia). Inform your doctor if you are taking oral contraceptive pills as this medicine reduces their levels in the body.