epilepsy
"In 1981 I have had my first seizures.  These were diagnosed as epilepsy.  My neurologist put me on Dilantin.  However, I got some side-effects dizziness, etc.  Later on, I have no seizures for more than 8 years where another doctor decreased the dose to 2 tablets a day.  After which, there were no more side-effects.  I was seizure-free for more than 20 years now.  Though I've got some backaches and I've developed osteoarthritis."