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My dog used Nexgard, Simparica. Is Credelio safe after FDA warnings?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 5 years and 11 months old | 53.5 lbs

In light of recent fda warnings, do you recommend oral flea/tick prevention? And, if a dog used nexgard, simparica in the past with no issues but is switching to Credelio would it follow that I should expect similar results (or no issues?) .... I know nothing can be 100% guaranteed.... just looking for opinions. Thank you

1 Answer

Most Helpful Answer

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Answered By Jeffrey Milner

Veterinarian

Published on October 6th, 2018

As you have already suggested, there are no absolutes. All the drugs the FDA mentioned in their recent warning are in the same class, including Credelio. Thus, I would venture to guess that it is unlikely Timmy with have a negative reaction to one but not the other. He does not appear to have a sensitivity to this class of drugs. There are always the off chance of allergies, but these are few and far between. Hope this makes sense.

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