Why is my kitten throwing up and having diarrhea after deworming?

Question

My kitten has hernia repair surgery 3 weeks ago so I felt safe deworming him now. I dewormer him night before last and now he is throwing up undigested food and also passing stool that is clear with undigested food pieces. What is wrong with him? He doesn't want to eat and isn't as active. Pet's info: Cat | Domestic Shorthair | Male | neutered | 5 lbs

Kevin Sanada, DVM · Accepted Answer

Chester likely has some sort of irritation to his stomach and intestines. These can be temporary, but they can get dehydrated quickly. There are many causes for vomiting and diarrhea including poison ingestion and infection. I doubt this has to do with the surgery, but may have something to do with the deworming. Deworming medication is usually quite safe, but make sure you gave the correct medication (Is it for a cat and age appropriate?). If he is still vomiting and having diarrhea tomorrow morning, then it is best to take him to the vet, so they can help identify the cause and make him feel better.

Why is my kitten throwing up and having diarrhea after deworming?

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