What is the cat puking up? Is the vomit debilitating, is it undigested food. Does he eat and then puke right away or does it wait a few hours before chucking. What does the vomit consist of? Bile, hair, colour? It there an increase in appetite or thirst? Weight gain or loss? Age of kitty and any other problems? Finally "what are you feeding him?" There are numerous remedies that address the GI tract in different ways.