Section 520.1441 - Milbemycin(a)Specifications. Each flavored tablet contains 2.3, 5.75, 11.5, or 23.0 milligrams (mg) of milbemycin oxime.(b)Sponsors. See Nos. 013744 and 058198 in § 510.600(c) of this chapter.(c)Conditions of use -(1)Dogs - (i)Amount. For hookworm, roundworm, and whipworm, administer 0.23 mg per pound (mg/lb) of body weight (0.5 mg per kilogram (mg/kg)). For heartworm, administer 0.05 mg/lb of body weight (0.1 mg/kg). Administer once a month.(ii)Indications for use. For prevention of heartworm disease caused by Dirofilaria immitis, control of hookworm infections caused by Ancylostoma caninum, and removal and control of adult roundworm infections caused by Toxocara canis and Toxascaris leonina and whipworm infections caused by Trichuris vulpis in dogs and puppies 4 weeks of age or greater and 2 pounds body weight or greater.(iii)Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian.(2)Cats - (i)Amount. Administer 0.91 mg/lb of body weight (2.0 mg/kg) once a month.(ii)Indications for use. For prevention of heartworm disease caused by Dirofilaria immitis and the removal of adult Toxocara cati (roundworm) and Ancylostoma tubaeforme (hookworm) infections in cats 6 weeks of age or greater and 1.5 pounds body weight or greater.(iii)Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian. 84 FR 12494 , Apr. 2, 2019