From the Manufacturer:
Hartz Just for Cats Catnip will help stimulate cats, increasing play and exercise. You will see them sniffing, licking, and chewing the catnip. The effect will last around 10 to 20 minutes. It will take approximately 1 to 2 hours before the cat will respond again to the catnip.
Comes in a sleek resealable pouch and contains no dust.