Whats in cap nip that makes the cats go crazy

Nepetalactone causes a hallucinogenic effect. Some say the effects are similar to LSD, others say similar to marijuana. Because cats roll on the floor, which mimics a female in estrus, it has been suggested that catnip acts as an aphrodisiac, but this is unlikely as males react in just the same way. What is likely is the cat is reacting to similar "feel good" pheromones released during sexual courtship/activity. However, non sexual behaviour including playing, chasing & hunting can also be observed. The response to catnip is via the olfactory system. Even cats who can't smell will can still respond to catnip.

The effects of catnip seem to change from cat to cat. I have one cat who drools & rolls on the floor, I have another one who becomes very hyperactive, a third becomes aggressive, and picks fights with the other cats when he's had catnip.

Catnip is not harmful to your cat. They won't overdose on it. Most cats know when they've had enough & will refuse any further offers.

Interestingly, researchers say that nepetalactone is about ten times more effective at repelling mosquitos than DEET, which is the active ingredient in most insect repellents. It was also discovered that catnip repels cockroaches too!* Plants aren't alone in containing nepetalactone, some insects & ants also contain it. It's been speculated that this protects them from insects.

Rats & mice are also believed to have a strong dislike of catnip & will avoid places where it grows.