A. Cats that are constantly vomiting and are also lethargic, not eating and vomiting up whole and digested kibble plus water should seek veterinary attention for fear of a possible foreign body or hairball that is stuck in the GI tract.
However if your cat is vomiting intermittently (once daily), able to keep down some meals, defecating normally, active and playful, then this most likely is dietary indiscretion (something he ate didn't agree with his stomach). If this is the case you can try some Famotidine (pepcid ac) @ 0.5-1mg/kg every 12 hrs given 45 minutes before his next meal. I would also recommend a low fat canned food like Purina EN Gastrointestinal to be given for the next 7 days to help settle his stomach. If he does not improve with the vomiting after 24-48 hrs with this supportive care regimen, then he needs to see a veterinarian for further care.
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