My dogs vomited after Comfortis. Should I switch flea prevention?

Question

After three months' giving my two dogs Comfortis with no issues, the other evening I gave them the correct dose with their supper and quite soon afterwards they both vomited their supper and their lunch. I did not re-dose them. I wonder if I should stay with Comfortis or switch to a different flea preventive. Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 35 lbs

Jenny, DVM · Accepted Answer

IF they vomited within an hour of the medication, then the medicine did not digest to work for them. This is the most common side effect of Comfortis and seems to be so often, I have quit recommending it. I have had great success with flea control and no vomiting side effects by using Nexgard for monthly or Bravecto given every 3 months. I would recommend changing products and if redosing them immediately if they vomited under an hour of getting the Comfortis.

My dogs vomited after Comfortis. Should I switch flea prevention?

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