Credelio Plus (lotilaner & milbemycin oxime) is a chewable tablet for dogs used to treat and prevent infestations of fleas, ticks, heartworm, and gastrointestinal worms. It's indicated for dogs requiring treatment for fleas and ticks along with either roundworms and hookworms, or prevention of heartworm and lungworm. Contains lotilaner, a member of the isoxazoline class.