Do different manufacturers use different ingredients in the dtug phenytoin. I am having very different side effects being on same drug but different manufacturer. Currently on phenytoin and had little to no side effects (manufacturer-Ameal) pharmacists recently gave same phenytoin diff color (manufacturer-Sun Pharmaceuticals) stronger seizure, anexity, slight numbness and or tiggling in arms legs hands feet.. what the heck is going on? (Bio- 32f. Started seizures 4yrs ago first was grand mal after been partial complex. 2 kids before and 2 kids since. Low iron Vit D diffency)