Sources2 references
Safe in moderation
Can cats eat catnip?
DogsCats
YES
Safe in moderation
Quick answer
Catnip is safe for cats and causes a short, harmless burst of excitement in most of them.
What to do
What to do if your cat ate catnip
Offer fresh or dried catnip in small amounts; eating too much can cause vomiting or diarrhea. The response is inherited, so a sizable share of cats do not react, and kittens under about 3 to 6 months usually do not.
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Disclaimer: This is general information, not veterinary advice. Every cat is different; if yours has health conditions or ate something unusual, contact your vet. Spotted a mistake? Email petbudgetcalculator@gmail.com.