been using pepcid for about 2 years now, these are the things ive learned from my experiences with it.  im a 5'9" 3/4 japanese 1/4 chinese male just for the record. these are some guidelines i live by

i take 60-80 mg of pepcid (ive built up a tolerance the past 2 years) on an empty stomach.  taking it on a full stomach works too, but when i take it on an empty stomach its way more effective.  the drawback to this is i get messed up way faster, and if i dont eat before going to bed i get a terrible hangover.

i notice when i pound a lot of water with my pepcid it works better

beer and wine will give me more of a flush than hard alcohol, but again the drawback is i get messed up faster.

if i drink my first drink kind of slow i dont get red at all

to make a long story short the shit works like a charm for me