520.1100—Griseofulvin.
(1)
No. 000061 for use of products described in paragraph (a) for use as in paragraph (d) of this section.
(2)
No. 059130 for use of the powder described in paragraph (a)(1) for use as in paragraphs (d)(1)(i)(A) and (d)(1)(ii) 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) Horses—
(A) For equine ringworm infection caused by Trichophyton equinum or Microsporum gypseum, administer soluble powder described in paragraph (a)(1) of this section daily as a drench or as a top dressing on feed for not less than 10 days as follows: adults, 2.5 grams; yearlings, 1.25 to 2.5 grams; and foals, 1.25 grams.
(B)
For treating ringworm infection caused by T. equinum, administer boluses described in paragraph (a)(2) of this section daily for not less than 10 days as follows: adults, 1 bolus; yearlings, one-half to 1 bolus; and foals, one-half bolus.
| Body weight (pounds) | Dosage (milligrams) |
|---|---|
| Up to 6 | 62.5 |
| 6 to 18 | 125 |
| 18 to 36 | 250 |
| 36 to 48 | 375 |
| 48 to 75 | 500 |
(B)
Weekly (single) dose: If experience indicates that treatment is more effective for the drug given in large doses, administer at intervals of 7 to 10 days, a dose equal to 10 milligrams/pound of body weight × body weight × number of days between treatments. Dosage should be adjusted according to response. Administer additional dose after the animal is free of infection.
(ii) Indications for use.
For treatment of fungal infections of the skin, hair, and claws caused by Trichophyton mentagrophytes, T. rubrum, T. schoenleini, T. sulphurem, T. verrucosum, T. interdigitale, Epidermophyton floccosum, Microsporum gypseum, M. canis, M. audouini.