Hi, welcome to our site. I am Dr Saumya Mittal. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query first, yes you are right, the drowsiness may indeed be due to the medicine she is consuming. and the mental slowing down, like not being interested in studies may be its result too as for the duration, the usual pattern is to continue medicines for at least 3 years before stopping however the cause of seizure is not clear from the query. if it was relatively treatable cause, the medicine can be discontinued, else it may need to be continues since a seizure is not a good symptom and makes the patient accident prone, i would suggest you to meet your neurologist especially for following things- a. change medicine/dose of current medicine b. is it safe to stop the medicine- keeping in view the cause of seizures i sincerely hope a ct/mri has been done so far, if not get it done I hope this helps you. Inform the reports mentioned above so i can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)