Our feline friends may go gaga for it, but how many of us actually know what catnip is? Our resident vet does, so we asked her everything we’ve been wondering about. What does catnip do to cats? Is catnip safe? And how much catnip is too much? Our vet has the answers.
What is catnip?
Catnip (also known as Nepeta cataria or catmint) is a natural herb that releases a volatile oil called nepetalactone. This oil mimics feline pheromones, often sending cats into a state of euphoria. There are two ways catnip can affect your cat:
- It can act as a sedative when eaten – you may find yourself with a sleepy feline if your cat has eaten a catnip leaf or catnip mixed into their food.
- It can act as a stimulant when sniffed – your cat may be bouncing off the walls (hopefully not literally!) after playing with catnip toys or smelling catnip spray.

Is catnip safe?
Yes, catnip is generally safe for cats. It is not harmful or addictive for them. It’s also safe for humans, although pregnant women should avoid consuming it. For example, a nice hot cup of catnip tea can be a soothing bedtime drink.
A question that our vet is frequently asked is “Can catnip make my cat aggressive?” In some cases, yes. Catnip can sometimes trigger aggressive behaviour, so if you live in a multi-cat household, it’s a good idea to introduce catnip to one cat at a time. Try playing with one cat using a catnip toy and see how they react before offering another catnip toy to your other cats. If your cat becomes aggressive, keep them separated until the effects wear off, which usually takes around 20–30 minutes.
What are the benefits of catnip for cats?
- Catnip encourages playful, predatory behaviour. In short, it brings out their naturally wild side.
- Catnip can give less active or overweight cats more motivation to exercise.
- Catnip toys for cats are a great boredom breaker, especially for indoor cats.
- When eaten, catnip can help your feline friend drift off to sleep.
Why doesn’t catnip affect every cat?
Not every cat responds to catnip, and that’s completely normal. Sensitivity to catnip is inherited, so around 30–50% of cats simply don’t have the gene that makes them react to it. Age can also play a role. Kittens under around six months old often show little or no interest in catnip, with many only becoming sensitive as they mature. So, if your cat doesn’t seem impressed by catnip, there’s absolutely nothing wrong with them.
5 ways to give catnip to your cat
1. Mix some catnip into their evening meal – they’ll be catnapping in no time.
2. Spray some catnip onto your cat’s scratching post or treat them to one that’s filled with catnip.
3. Fill a KONG toy with loose-leaf catnip and watch them master the challenge.
4. Pre-filled catnip toys are a great way to get your cat up and moving, encouraging more exercise.
5. Pick up some catnip seeds or a young plant from your local garden centre and grow your own. Your cat will love the endless supply of fresh catnip, and you can dry any leftover leaves to use later.
The verdict: Is catnip good for cats?
For most cats, catnip is a fun and enriching treat that can encourage play, help relieve boredom, or promote relaxation. While not every cat will respond to it, those that do can get plenty of enjoyment from it. As with any treat or toy, it’s best given in moderation and under your supervision, especially if your cat tends to become overstimulated. If you ever have concerns about your cat’s behaviour or whether catnip is right for them, your vet will be happy to help.
Our articles are not intended to replace face-to-face vet advice. If you’re worried about your pet’s health or behaviour, speak to your vet.

