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Hello and thanks for trusting me to help you and your cat today. I am a licensed veterinarian with over 25 years experience and would be happy work with you.
Pepcid is a very effective antacid, but if it is not working to decrease his symptoms, it may be that there is more that gastric acid reflux going on. Inflammatory bowel disease (IBD) is a very common cause of GI upset in cats ranging from nausea to vomiting to anorexia and can present very intermittently. It may be that he needs more than pepcid to manage his disease and I would talk to your vet about possibly changing his diet or adding other GI medications like cerenia or metronidazole. Ultimately, some of these cats need steroids to manage their disease, but many can be managed by other means for quite awhile before the disease progresses.
Here is a link with more information about IBD in cats. LINK HERE
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You are most welcome. Yes, try that first and let's see how things go. I can follow up at any time if there are further questions.