on March 25th the first couple of days I felt really tired, other than that the only other side effect I have experienced is I cannot drink any carbonated beverage at all anymore. My question is how long does it take for this medicine to come into full effect? Is the generic topiramate any difference than the real topamax? I started out taking 25 mg 2x a day the first week and then 50 mg 2x a day there after. Thanks for any suggestions. I take this for migraines btw =)