How do you get a child with a HORRIBLE gag reflex to take medication?

Our 3 year old son will not/usually can't, take his medications, which often taste horrible I admit. He has some food allergies (some of which I think have yet to be identified). He has been prescribed all sorts of things, including basic antibiotics for sinus infections, ect..... He has a VERY strong gag reflex and whenever you get him to take it, either willingly or by making him, he often gags and throws up. We have always tried both liquid and pill form, pills usually crushed, (he won't swallow whole pills for the same reason), and mixed with all sorts of different things to mask the taste. We have found nothing that will get it by him, and believe me we have tried EVERYTHING we can think of or has been suggested. G koolaid has been the only, (but very seldom), successful thing tried. He has been to lots of doctors for various issues (including gastro, so yes, the gag reflex has been addressed with several doctors, with no answers or suggestions we haven't tried). As a parent, I feel it is my responsibility to get my child to take the medication prescribed to him, but most of the time it is simply impossible. It would seem unnecessary, if not downright mean, to have to take him in for IV's of everything because he won't take it. Anyone else out there had the same problem and found a magical way of making it work? This is seriously not your average kid that won't take his medicine.