INTERCEPTORâ„¢ PLUS helps protect dogs from heartworm and parasites. These chewable tablets contain milbemycin oxime and praziquantel. It prevents heartworm disease while it also treats and controls common intestinal parasites, including roundworms, hookworms, and whipworms. This package contains six chewables for dogs and puppies 25.1-50 lbs and 6 weeks of age and older.