hi. i just recently learned of this pepcid ac thing from my cousin & i'm really hoping it works & this forum has encouraged me to try it. i turn horribly red after literally 3 sips of beer and i get that pounding headache and heart racing, the whole works.  & yeah, i get tired of explaining why i get so red and telling people i'm fine when they ask me if i'm okay.  & my friends saying "you're red." yeah i know. haha. anyway i'm drinking this weekend so hopefully pepcid will work.  i'm only 17 and i'm 5'5" and 103 lbs. i'm just have a high metabolism, i'm not unhealthy or anything.  i actually eat a lot. but i'm wondering if i should take a smaller dosage because i'm so light and when?