epilepsy
"I have been diagnosed with absence seizures for 6 years now, and have been taking Depakote ER.  I have been seizure-free for 4 years, but have had severe migraines on and off, usually more during times of intense stress.  My doctor prescribed me Tegretol to take as needed for them about a year ago, and it has always been 100% effective.  The only side effect is that it makes me very drowsy."