 [ Symptoms ] hair loss and topamax why was not i warned of this  i took the drug topamax for migraines my hair has been falling out and is very thin i finally stopped taking it but am outraged that i was not ever told of this side effect and am terrified that my hair will both not stop falling out and never return i am currently taking g biotin and going to start nioxin it is embarrassing and horrifying [ Disease ] i am sorry this is happening to you the reason why you were not told about this as a side effect is that it is so rare as to be unknown i just read off the list of side effects for topamax topiramate and hair lost was not listed so the doctor and pharmacist would not have had any way to know your hair loss might be a rare side effect but it might have another cause too so ask your doctor to help you check for causes here is some more information if you want to read further <link>#side effects