---
kind: "section"
citation: "21 C.F.R. § 520.763a"
title: "21"
number: "520.763a"
heading: "Dithiazanine tablets."
url: "https://uscodex.org/cfr/21/520.763a"
---

# §520.763a. Dithiazanine tablets.

- (a) **Specifications.** Each tablet contains 10, 50, 100, or 200 milligrams (mg) dithiazanine iodide.
- (b) **Sponsor.** See No. 069043 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Conditions of use in dogs—**
  - (1) **Indications for use and amount.** Administer orally immediately after feeding as follows:
    - (i) **For large roundworms (<I>Toxocara canis, Toxascaris leonina</I>)—** 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 (<I>Strongyloides canis, Strongyloides stercoralis</I>)—** 10 mg/lb of body weight for 10 to 12 days;
    - (iv) **For heartworm microfilariae (<I>Dirofilaria immitus</I>)—** 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.

## Notes

### Amendments

[79 FR 28820, May 20, 2014, as amended at 83 FR 48945, Sept. 28, 2018]

### Authority

Authority: 21 U.S.C. 360b.

### Source

Source: 40 FR 13838, Mar. 27, 1975, unless otherwise noted.

### Amendments

[79 FR 28820, May 20, 2014, as amended at 83 FR 48945, Sept. 28, 2018]