Bob Martin Wormer Tablets for cats and kittens over 12 weeks old is a highly effective treatment against the most common types of worms, roundworm and tapeworm. Clinically proven, these tablets are easy to use, requiring only one dose to help keep your cat healthy and worm free. There is no permanent treatment for worms, and there aren't always symptoms so veterinarians recommend that cats be wormed regularly - every 3-6 months as a routine measure. This product has been specially developed to make worming easy - the tablets require only one dose to keep your cat healthy and worm free.