---
kind: "section"
citation: "21 C.F.R. § 520.90b"
title: "21"
number: "520.90b"
heading: "Ampicillin capsules."
url: "https://uscodex.org/cfr/21/520.90b"
---

# §520.90b. Ampicillin capsules.

- (a) **Specifications.** Each capsule contains ampicillin trihydrate equivalent to 125, 250, or 500 milligrams of ampicillin.
- (b) **Sponsor.** See No. 054771 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Conditions of use—**
  - (1) **Dogs—**
    - (i) **Amount.** 5 to 10 milligrams per pound of body weight two or three times daily. In severe or acute conditions, 10 milligrams per pound of body weight, three times daily. Administer 1 to 2 hours prior to feeding.
    - (ii) **Indications for use.** Treatment against strains of gram-negative and gram-positive organisms sensitive to ampicillin and associated with respiratory tract infections (tracheobronchitis and tonsillitis); urinary tract infections (cystitis); bacterial gastroenteritis; generalized infections (septicemia) associated with abscesses, lacerations, and wounds; and bacterial dermatitis.
    - (iii) **Limitations.** Federal law restricts this drug to use by or on the order of a licensed veterinarian.
  - (2) **Cats—**
    - (i) **Amount.** 10 to 30 milligrams per pound of body weight or three times daily. Administer 1 to 2 hours prior to feeding.
    - (ii) **Indications for use.** Treatment against strains of gram-negative and gram-positive organisms sensitive to ampicillin and associated with respiratory tract infections (bacterial pneumonia); urinary tract infections (cystitis); and generalized infections (septicemia) associated with abscesses, lacerations, and wounds.
    - (iii) **Limitations.** Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[57 FR 37321, Aug. 18, 1992, as amended at 58 FR 61016, Nov. 19, 1993; 79 FR 28818, May 20, 2014. Redesignated at 85 FR 18118, Apr. 1, 2020]

### Authority

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

### Source

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

### Amendments

[57 FR 37321, Aug. 18, 1992, as amended at 58 FR 61016, Nov. 19, 1993; 79 FR 28818, May 20, 2014. Redesignated at 85 FR 18118, Apr. 1, 2020]