Have you called your vet regarding your concern? If he is throwing up after the meds he is probably also throwing up the drug when he does. What type of food are you giving as the meal? Maybe you could give a little yogurt in addition to the pepcid. But it's best to share your concerns with the vet.
__________________ “Never argue with a fool, onlookers may not be able to tell the difference.”  Mark Twain |