Catnip is the one toy ingredient with a pharmacology. The plant carries nepetalactone, a volatile compound that binds to a receptor in the cat's olfactory epithelium — the tissue at the back of the nose, not the vomeronasal organ used for scent-marking. The signal goes to the amygdala and hypothalamus rather than the usual smell-processing route, which is why the output looks less like interest and more like a short, harmless intoxication: rolling, chin and cheek rubbing, hind-leg kicking, dilated pupils, the occasional yowl, then a sudden loss of interest and a session of grooming.
What the response actually looks like
A positive reaction usually lasts 5 to 15 minutes and follows a predictable shape: sniff, lick, chew, then roll and rub along the ground, sometimes with a burst of zooming. Some cats go quiet and glassy instead, and a few become briefly pushy with other cats. All of it is normal and none of it is harmful. What is not normal is panting, drooling heavily, vomiting, or a cat that stays agitated for more than about half an hour.
The response is not a "high" in the way people assume. It resembles the behaviour of a female cat in oestrus, which is why unneutered males sometimes respond by mounting the toy.
Why roughly one cat in three does not react
Sensitivity is inherited, not learned, and it is not a matter of exposure or brand. About one cat in three carries no working version of the receptor and will sniff a handful of dried catnip and walk away, permanently. You cannot train it, and you should not keep buying different brands hoping one works. Test with a small pinch on the floor: no reaction within two minutes means this cat is in the non-responder group.
Age matters at the other end. Kittens under about three months almost never respond, and the behaviour typically appears between three and six months. A kitten that ignores catnip is not defective; it is early. Older cats may respond less as their sense of smell declines.
The refractory window: why the second hit does nothing
The effect cannot be stacked. After a full response, most cats are unreceptive for 30 minutes to 2 hours, and a toy pushed at them during that window gets ignored or actively avoided. This is the single most common mistake owners make: leaving a catnip toy on the floor all day, so the cat meets it already saturated and learns to ignore it.
Offer it in sessions instead. Ten minutes of play, then put the toy away in a sealed bag. Two or three sessions a day is plenty, and the enforced break is what keeps the response strong over months rather than days.
Catnip, silvervine, valerian and gall fruit
These are four different plants with four different active compounds, and a cat that ignores one may respond strongly to another. Silvervine is the reliable fallback for the one-in-three group.
| Plant | Active compound | Response rate | Best form |
|---|---|---|---|
| Catnip (Nepeta cataria) | Nepetalactone | About two in three cats | Dried leaf, spray |
| Silvervine (Actinidia polygama) | Actinidine and nepetalactol | More cats than catnip, including many non-responders | Dried powder, sticks, gall fruit |
| Valerian root | Isovaleric acid | A minority; smells of stale socks to humans | Dried root in a toy |
| Gall fruit | Actinidine, concentrated | Similar to silvervine, often stronger | Whole dried fruit, chews |
Gall fruit is the small woody swelling on silvervine vines, and it is usually the strongest of the four by weight. Silvervine sticks are sold for chewing, which is a different job: the wood fibres clean the sides of the teeth, and the cat should be allowed to chew them down but not to swallow splinters.
Dried, sprayed or in a stick
Dried leaf loses potency as it oxidises. Buy small quantities, store airtight in the dark, and expect a noticeable drop after 6 to 12 months. 2 g is enough to refill several toys.
Sprays are more consistent because the compound is sealed in liquid. Two or three pumps onto a scratch post or a cardboard box, from about 20 cm away, then let it dry for a few minutes before the cat arrives. Spraying a cat directly, or spraying bedding the cat sleeps in, is wasted: the volatile fraction is gone within hours.
Refresh a sprayed surface every 3 to 7 days, and stop when the cat stops reacting to that surface — rotating between three locations works better than soaking one.
Using it on purpose
- Rub a pinch into a new kick toy or cardboard scratcher to make it interesting on day one.
- Put a little on the inside of the carrier 10 minutes before a vet visit; a cat that is rolling is easier to load than a cat that is hiding.
- Use it after nail trims, not before, so the cat is relaxed rather than over-aroused while you hold a paw.
- Skip it in a multi-cat home with active tension: catnip can tip a tense pair into a scuffle. Our behaviour section covers introductions.
Do not use it as a bribe for food or medication, and do not rely on it to fix boredom.
Overeating, ingestion and what is actually toxic
Catnip and silvervine are not toxic to cats. Eating a large amount of dried leaf can cause vomiting or loose stool simply through volume, so keep the bag out of reach and expect a cat that has eaten a whole pouch to be mildly unwell for a day. Call a vet if vomiting repeats more than three times or the cat stops drinking.
The real toxic risks come from what is added. Essential oils are the common one: tea tree, eucalyptus, citrus, peppermint and wintergreen are all unsafe for cats, and a "natural" catnip spray built on essential oil is a different product from a catnip infusion. Permethrin, sometimes present in dog flea products stored beside the toys, is far more dangerous than any plant in this article. If a cat has walked through a sprayed surface and then groomed itself heavily, or shows tremors, drooling or wobbling, treat it as an emergency — the health section lists the signs that need a same-day call.
For kittens, the age calculator is a quick way to check whether a cat is past the three-month mark.
Frequently asked
My cat ignores catnip completely. Is something wrong with it?
Nothing is wrong. Roughly one cat in three inherits no working receptor for nepetalactone and will never respond, at any age or with any brand. Try silvervine or a gall fruit instead, since a large share of catnip non-responders do react to actinidine.
How often can I give catnip?
Two or three short sessions a day at most, each followed by a 30-minute to 2-hour break. Cats become unreceptive during that window, and a toy left on the floor all day gets ignored permanently because the cat never meets it fresh.
Is it safe if my cat eats the catnip?
Catnip and silvervine are not toxic, but a large amount of dried leaf can cause vomiting or loose stool from volume alone. Keep the bag sealed and out of reach, and call a vet if vomiting repeats more than three times or the cat stops drinking.