Profender is the only spot-on Allwormer that kills the most common intestinal worm in cats. Used every three months, Profender treats lungworm and protects your cat and your family from gastrointestinal worms. Profender kills all infective stages of roundworms, hookworm and tapeworm. All with one easy spot-on treatment so you don't have to endure the trauma of tableting. And while it's tough on worms, it's gentle on your cat. It's safe for kittens after 8 weeks of age and can be used during pregnancy and lactaction.