Within months of starting Phenytoin (generic dilantin) I started aching in most joints and muscles. I started OTC meds which helped a little. Within another year or so, most aches went away. The only aches left are on the bottom of my feet... toes to arch only, on both feet. Another is painful rotator cuffs injured during a seizure almost 2 years ago. The OTC meds help some of the time, depending on how much I walk and use my arms... but nowhere near healed. I tried naproxen, but the OTC ones worked better and didn't cause stomach upset.