Frequently Question Q1: Does catnip, silvervine or gall fruit work on all cats? A: A small part of cats may not respond to catnip or silvervine. It depends on both heredity and age matter. The kittens more than 3 months old can respond to catnip or silvervine. Veterinary studies suggest that about 70% -80% of cats will have a behavioral reaction to catnip and silvervine. About 90% of cats will like the gall fruit with some energetic reactions. Q2: How do cats react to catnip, silvervine and gall fruit? A: Most cats will roll on the ground, meow, rubbing face or even drool Q3: Are catnip silvervine and gall fruit potentially harmful? A: Catnip, silvervine and gall fruit are all natural herbs, they are not toxic and addictive. In fact, they are healthy for cats, promote exercise and improve digestion, reduce pain caused by flatulence and stomachache, helpful to relieve cat's anxiety, make them relax.A teeny-tiny part of cats might overreact to catnip, silvervine and gall fruit. Those cats might urinate frequently or even vomit. But please rest assured they are not really getting sick. For most cats, reduce frequency of use and they will recover soon. If not, cats may be sick because of some other reasons, you'd better take her to vet. Q4: How long does catnip silvervine and gall fruit last? A: Usually these sessions last about 10 minutes, after which your cat loses interest. It may take as long as 30-120 minutes for cats to become susceptible to catnip, silvervine and gall fruit again. Most cats are unlikely to overdose on catnip. Trust them to know when they ve had enough.