Nictal 150mg Tablet IR is used to treat and prevent epilepsy (seizures). However, it cannot cure epilepsy and will only work to prevent seizures for as long as you continue to take the medicine. Nictal 150mg Tablet IR may be used alone or in combination with other medicines. The dose and how often you need to take it will be decided by your doctor so that you get the right amount to control your symptoms. It may be increased gradually. You can take this medicine with or without food but take it at the same time each day to get the most benefit. It usually takes a couple of weeks to work. It is important to take this medicine regularly and for as long as you are advised, even if you feel well. Missing doses may trigger seizures and, if you stop, your condition may get worse. It should never be stopped suddenly. The most common side effects of this medicine include nausea, vomiting, feeling dizzy, tired or drowsy, and unsteadiness. Most of these are not serious. Keep taking the medicine but talk to your doctor if these side effects bother you or do not go away. However, if you notice a skin rash or redness, tell your doctor straight away. It could develop into a life-threatening skin condition called Stevens-Johnson syndrome. Long-term treatment with this medicine can cause osteoporosis (reduced bone mass) and increase your risk of breaking a bone. Anticonvulsants like this medicine may cause suicidal thoughts and behaviors. If your mood becomes depressed, tell your doctor. This medicine may not be suitable for everybody. Before using it, tell your doctor if you have ever had heart problems, kidney or liver disease, difficulty urinating, depression, or suicidal thoughts. Many other medicines can interfere with it and some should not be taken together so tell your doctor all the medicines you are taking to make sure it is safe. If you are pregnant, do not start or stop taking this medicine without asking your doctor. Drinking alcohol should be avoided as it can increase some of the side effects and can also increase your risk of seizures. You may need frequent blood tests to help your doctor make sure you are taking the right dose both before you start and while you are using it.