I cant believe I only just found this topic...

My DS was on Zantac aswell, we did the same as some of the others have suggested - burp every 30mls, mattress on an angle...

Also, the 1 thing I wasnt told about Zantac - as your baby puts on weight, the dosage needs to be increased. G was a different baby when he first started taking it, but after 2 weeks, he started to go backwards. We spoke to the GP, increased the dosage, and it worked a treat!

Having said all that, he was only on it for a couple of months and then he grew out of it, thankfully!

Good Luck, I hope it works for you.