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Coraxis, moxidectin, is a prescription heartworm medication for dogs that also controls intestinal parasite infections. Coraxis is a liquid applied topically to the skin, and provides 30 days of protection. Coraxis kills heartworm larvae for the prevention of heartworm disease, hookworms, roundworms, and whipworms. This medication is for use in dogs and puppies 7 weeks of age or older and weighing 3lbs or greater.