Vet Q & AMy cat threw up Comfortis flea medicine. Is it still effective?
Poor Clair! The Comfortis tablet often dissolves quite quickly, but Elanco reps have said that if a cat vomits within an hour of medication administration, the cat should receive another dose. To confirm this information and to report Clair's vomiting, I recommend calling the phone number on the Comfortis packaging.
Updated on September 24th, 2025