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My dog vomits after wormer. Is it effective? What dewormer is safe?

Updated on September 23rd, 2025

Whenever we give my dog his wormer he is sick about 3 hours after. Does it still work. Which wormer should i use in future to keep him protected?

3 Answers

Most Helpful Answer

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on September 4th, 2016

If your dog is sick three hours after giving the worming treatment, this should be sufficient time for the worming treatment to be absorbed. To err on the side of caution, if your dog is known to be infested with worms, it might be a good idea to re-treat him in a week's time with a different product. I'm not sure which product you are currently using, but I recommend using Drontal. You can get a Drontal tablet from your vet. If that doesn't make him sick, you can use it as your regular worming treatment.

51Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By David Elbeze, DVM, MRCVS
Veterinarian
If he throws up 3 hours later, the wormer will still work, but it is of course not ideal. Try using different brands until you find one that does not cause this side effect. Try Drontal or Milbemax
32Pet Parents found this answer helpful
Answered By Jennifer Ladd, DVM
Veterinarian
Published on May 17th, 2017
It is likely a reaction to the dewormer. With worming medication, I always recommend using a product sold by your veterinarian rather than one purchased over the counter as some of the formulations available over the counter have more side effects. For puppies I like Drontal Plus (a combination of Pyrantel and Praziquantel). I would feed a bland diet of boiled chicken and rice for the next 2 days. If the vomiting continues today I would bring him in for an exam.
1Pet Parents found this answer helpful

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