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If you are confident there was only 2 or 3 tablets, you are in great shape. It still could cause vomiting or diarrhea, but this is not a very high overdose. I see no indication to induce vomiting with that number of tablets ingested.
You could give a tablet of maximum strength 20mg Pepcid A.C. antacid to help settle the stomach.
Now, if it was several tablets, you should contact an ER veterinarian immediately to do some additional supportive care. Also, inducing vomiting is really only of benefit with certain toxicities when induced within 1 hour of ingestion. So, I have no indication for you to induce vomiting at this time. Giving the Pepcid A.C. would be really wise, and I would still consult a local vet if any illness were to develop. Also, if any vomiting or diarrhea, watch for any blood in the vomiting or blood in the stool.
Understood. Well, the safest course of action would be to still go to an ER vet and start some protective medications for the stomach and intestinal tract. I wish I could give you a definitive answer but with not knowing the number of tablets, I can only speak generally.