---
kind: "section"
citation: "21 C.F.R. § 524.1600b"
title: "21"
number: "524.1600b"
heading: "Nystatin, neomycin, thiostrepton, and triamcinolone ophthalmic ointment."
url: "https://uscodex.org/cfr/21/524.1600b"
---

# §524.1600b. Nystatin, neomycin, thiostrepton, and triamcinolone ophthalmic ointment.

- (a) **Specifications.** Each cubic centimeter of ointment contains: 100,000 units of nystatin, neomycin sulfate equivalent to 2.5 milligrams of neomycin base, 2,500 units of thiostrepton, and 1.0 milligram of triamcinolone acetonide.
- (b) **Sponsor.** See No. 053501 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See §§ [556.430](/cfr/21/556.430.md) and [556.470](/cfr/21/556.470.md) of this chapter.
- (d) **Conditions of use—**
  - (1) **Dogs and cats—**
    - (i) **Amount.** Apply 1 drop of ointment to the affected eye(s) 2 or 3 times daily. Treatment may be continued for up to 2 weeks if necessary.
    - (ii) **Indications for use.** For use as an anti-inflammatory, antipruritic, antifungal (Candida albicans), and antibacterial ointment for local therapy in keratitis and conjunctivitis.
    - (iii) **Limitations.** Federal law restricts this drug to use by or on the order of a licensed veterinarian.
  - (2) **Cattle—**
    - (i) **Amount.** Apply small line of ointment to the affected eye(s) once daily. Treatment may be continued for up to 2 weeks if necessary.
    - (ii) **Indications for use.** For infectious kerato-conjunctivitis (pinkeye).
    - (iii) **Limitations.** Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[40 FR 13873, Mar. 27, 1975, as amended at 50 FR 41490, Oct. 11, 1985; 79 FR 10972, Feb. 27, 2014; 84 FR 32993, July 11, 2019]

### Authority

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

### Source

Source: 40 FR 13873, Mar. 27, 1975, unless otherwise noted.

### Amendments

[40 FR 13873, Mar. 27, 1975, as amended at 50 FR 41490, Oct. 11, 1985; 79 FR 10972, Feb. 27, 2014; 84 FR 32993, July 11, 2019]