Section 520.1193 - Ivermectin tablets and chewables(a)Specifications.(1) Each tablet or chewable contains 68, 136, or 272 micrograms (mcg) ivermectin.(2) Each chewable contains 55 or 165 mcg ivermectin.(b)Sponsors. See sponsors in § 510.600(c) of this chapter for use as in paragraph (d) of this section. (1) No. 000010 for use of tablets or chewables described in paragraph (a)(1) as in paragraph (d)(1) and chewables described in paragraph (a)(2) as in paragraph (d)(2) of this section.(2) Nos. 051311 and 069043 for use of tablets described in paragraph (a)(1) as in paragraph (d)(1) of this section.(c)Special considerations. Federal law restricts this drug to use by or on the order of a licensed veterinarian.(d)Conditions of use - (1)Dogs. For use in dogs 6 weeks of age and older as follows:(i)Amount. 6.0 mcg per kilogram (kg) of body weight (2.72 mcg per pound (lb)), minimum. Up to 25 lb, 68 mcg; 26 to 50 lb, 136 mcg; 51 to 100 lb, 272 mcg; over 100 lb, a combination of the appropriate tablets. Administer at monthly dosing intervals.(ii)Indications for use. To prevent canine heartworm disease by eliminating the tissue stage of heartworm larvae (Dirofilaria immitis) for 1 month (30 days) after infection.(2)Cats. For use in cats 6 weeks of age and older as follows:(i)Amount. Up to 2.3 kilograms (up to 5 lb), 55 mcg; 2.3 to 6.8 kilograms (5 to 15 lb), 165 mcg; over 6.8 kilograms (15 lb), a combination of the appropriate chewables (recommended minimum dose of 24 mcg/kg of body weight (10.9 mcg/lb)). Administer once a month.(ii)Indications for use. To prevent feline heartworm disease by eliminating the tissue stage of heartworm larvae Dirofilaria immitis for a month (30 days) after infection, and for removal and control of adult and immature (L4) hookworms Ancylostoma tubaeforme and A. braziliense. 67 FR 11230 , Mar. 13, 2002, as amended at 67 FR 21996 , May 2, 2002; 69 FR 43735 , July 22, 2004; 81 FR 17607 , Mar. 30, 2016; 84 FR 39183 , Aug. 9, 2019 81 FR 17607, 3/30/2016; 84 FR 39183, 8/9/2019