Section 520.763b - Dithiazanine powder(a)Specifications. Each tablespoon of powder contains 200 milligrams (mg) dithiazanine iodide.(b)Sponsor. See No. 069043 in § 510.600(c) of this chapter.(c)Conditions of use in dogs -(1)Indications for use and amount. Administer orally by mixing in food as follows: (i) For large roundworms (Toxocara canis, Toxascaris leonina): 10 mg per pound (/lb) of body weight for 3 to 5 days;(ii) For hookworms (Ancylostoma caninum, Uncinaria stenocephala) and whipworms (Trichuris vulpis): 10 mg/lb of body weight for 7 days;(iii) For Strongyloides (Strongyloides canis,Strongyloides stercoralis): 10 mg/lb of body weight for 10 to 12 days;(iv) For heartworm microfilariae (Dirofilaria immitus): 3 to 5 mg/lb of body weight for 7 to 10 days. Treatment for heartworm microfilariae should follow 6 weeks after therapy for adult worms.(2)Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian. 79 FR 28820 , May 20, 2014, as amended at 83 FR 48945 , Sept. 28, 2018 As amended at 83 FR 48945, 9/28/2018