1. Watch for Adverse Reactions
After you have given your cat the flea and tick treatment -- either pill, spot on or otherwise -- watch the cat for a time after to monitor for any adverse effects, such as drooling, stumbling, loss of coordination, seizures, etc. If any unusual signs appear, or if your cat behaves in any way out of the ordinary, wash the cat off with a light soap and rinse the coat thoroughly with water. Follow this immediately with a visit to your veterinarian for a check-up and treatment if needed.