If the Zantac is being spit out, ask your doctor to switch to Axid. It is basically the same thing and works the same way, but it does not have the alcohol content of Zantac and tastes much better. The dose is not as quickly outgrown either IIRC. You can also try having the Zanctac flavored, but the only compatible flavoring is grape. One of my babies also took Prevacid solutabs, in additon to Axid, and I tucked it in his cheek to dissolve.
Just saying from the mom of four reflux babies They never tell you there are options.