Beaphar WORMclear for cats kills roundworms and tapeworms. It can be used on cats and kittens from 6 weeks of age and is effective in one simple dose. Kittens should be treated every 14 days until 2-3 weeks after weaning. To remain worm free adult cats should be treated every 3 months and any sources of re-infestation such as fleas or mice should be removed.