Since you have been taking Phenytoin regularly for 18 months without another fit, it may feel like the problem has completely resolved, but stopping the medicine suddenly can still be risky. Seizure medicines are usually continued for a specific duration depending on the cause of the first fit, brain scan findings, EEG results, and overall seizure risk. Treatment should be taken only if advised or prescribed by your doctor. Do not stop or reduce the medicine on your own, even temporarily, because sudden withdrawal may trigger another seizure in some people. Doctors usually decide slowly and carefully whether the medicine can be reduced after proper evaluation. Getting enough sleep, avoiding alcohol, reducing stress, and taking the medicine at the same time daily are also important to reduce seizure risk. Please consult your doctor before making any change, especially if you develop dizziness, unusual movements, confusion, or another fit episode.