Generally, catnip is considered safe for cats. They will usually self-regulate their exposure; if they've had too much, they will typically show disinterest and walk away.

If a cat consumes a large amount of catnip, they might experience mild digestive upset, but this is rare. With repeated exposure, some cats may become less responsive to catnip over time. This doesn't mean they've been harmed - they've simply developed a tolerance, which mean it will likely not affect them in the long run.

Overall, catnip is just a fun treat for your cat and should not cause dangerous long term effects.
However, if you cat is experiencing any concerning effects, please contact your veterinarian.
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