---
kind: "section"
citation: "21 C.F.R. § 520.1242g"
title: "21"
number: "520.1242g"
heading: "Levamisole resinate and famphur paste."
url: "https://uscodex.org/cfr/21/520.1242g"
---

# §520.1242g. Levamisole resinate and famphur paste.

- (a) **Specifications.** The drug is a paste containing 11.6 percent levamisole resinate (50 percent potency) and 23.6 percent famphur.
- (b) **Sponsor.** See 000061 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Special considerations.** Do not use any cholinesterase-inhibiting drugs, pesticides, insecticides, or chemicals on cattle simultaneously or within a few days before or after treatment with this product.
- (d) **Related tolerances.** See §§ [556.273](/cfr/21/556.273.md) and [556.350](/cfr/21/556.350.md) of this chapter.
- (e) **Conditions of use in cattle—**
  - (1) **Amount.** 8 milligrams of levamisole hydrochloride (equivalent) and 30 milligrams of famphur activity per kilogram of body weight.
  - (2) **Indications for use.** For treatment of cattle infected with the following parasites: Stomach worms (Haemonchus, Trichostrongylus, Ostertagia), intestinal worms (Trichostrongylus, Cooperia, Nematodirus, Bunostomum, Oesophagostomum), lungworms (Dictyocaulus), cattle grubs (Hypoderma), biting lice (Bovicola), and sucking lice (Linognathus, Solenoptes).
  - (3) **Limitations.** Drug is not effective against lice eggs. Conditions of constant helminth and ectoparasitic exposure may require retreatment within 2 to 4 weeks after first treatment. Do not administer to cattle within 19 days of slaughter. Do not administer to dairy animals of breeding age. Do not use in calves less than 3 months old, or in debilitated animals. Do not treat Brahman bulls. Consult your veterinarian for assistance in the diagnosis, treatment, and control of parasitism.

## Notes

### Amendments

[53 FR 23757, June 24, 1988, as amended at 54 FR 1353, Jan. 13, 1989; 57 FR 7652, Mar. 4, 1992; 62 FR 55160, Oct. 23, 1997; 62 FR 61625, Nov. 19, 1997; 78 FR 28823, May 20, 2014]

### Authority

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

### Source

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

### Amendments

[53 FR 23757, June 24, 1988, as amended at 54 FR 1353, Jan. 13, 1989; 57 FR 7652, Mar. 4, 1992; 62 FR 55160, Oct. 23, 1997; 62 FR 61625, Nov. 19, 1997; 78 FR 28823, May 20, 2014]