Benadryl dosage for catsYou should always consult your vet before beginning any medication regimen. However, recommended doses of Benadryl for cats are typically 1 mg per 1 pound, to be given every 8-12 hours as needed.
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It usually takes Benadryl about 15 to 30 minutes to start working. The effects of Benadryl tend to last for 4 to 6 hours, but the medication can stick around in the body for much longer. Since Benadryl can make you sleepy, it can be best to take it in the evening.