So our friend just got back from spending a couple weeks in Arizona.  Said that the rage out there is people using Mylanta on their horses, 30cc's when saddleing.  Whats everyones thought on this?  Work like Zestera, Gastrogard, Ulcergard?

That's an old horseman's trick. When I worked on a TB breeding farm (years ago) they used to give babies with foal heat diarrhea and horses in training 

I started using it about 15 years ago, my vet told me. I did 60cc, by the time it dribbles out its probably 30-50cc ingested, depending on horse's reactions. It's good for ulcer diagnosis, if you've got one you suspect you can ride/run them on it & see if their symptoms reduce or go away. Then you have your answer. I've never done it regularly for prevention, just a few times if it was all I had that day 

Would it be like using Zestera, Ulcergard or Gastrogard?  She has had 3 months off, eats Impact Performance and alfalfa.  Also started her on Forco.  Towards the last of the season she was a different horse with the gastrogard, 1/4 tube day before and 1/2 tube day of.  I always gave her Zestera before I did the gastrogard.

Probably not as effective, it has a shorter active life in their gut. It helps to coat the lining to reduce acid contact, while the others like omeprazole, buffer/reduce the acid. 

I do it, started because of a chronically ulcerous gelding that NOTHING was working.  The way I see it, it's cheap enough if it works, GREAT.  But if not, at least it makes me feel better and it can't hurt.  I felt like it helped him though.