seizures
"This has been the better of the 10 others we have been on with our young son. I will say that he has recently developed leg and lower back pain along with more frequent migraines and hair loss and a horrible rash on arms in legs. Also, some weight and memory loss along with some crying fits. But like I said, sadly this was the least side effects of all the ones we have been on. Topamax was the worst, it trashed his insides and turned my sweet child into a crying, crazy, cursing lunatic! Would love to know if anyone has had luck with less side effects on any other anti-epileptic meds. He goes several weeks so far without any seizures on Vimpat so far."