21 C.F.R. § 520.1242f
Levamisol gel.
Cite as 21 C.F.R. § 520.1242f (2026)
(a)
Specifications.
Each gram of gel contains 115 milligrams (11.5 percent) levamisol hydrochloride.
(b)
Sponsor.
See No. 054771 in § 510.600(c) of this chapter.
(c)
Related tolerances.
See § 556.350 of this chapter.
(d)
Conditions of use
—(1)
Cattle
—(i)
Amount.
Eight milligrams of levamisole hydrochloride per kilogram of body weight, as a single oral dose.
(ii)
Indications for use.
Anthelmintic effective against the following nematode infections: Stomach worms (
Haemonchus, Trichostrongylus, Ostertagia
), intestinal worms (
Trichostrongylus, Cooperia, Nematodirus, Bunostomum, Oesophagostomum
), and lungworms (
Dictyocaulus
).
(iii)
Limitations.
Conditions of constant helminth exposure may require re-treatment within 2 to 4 weeks after the first treatment; do not administer to cattle within 6 days of slaughter for food; do not administer to dairy animals of breeding age; consult veterinarian before using in severely debilitated animals.
(2)
Breeding swine
—(i)
Amount.
Eight milligrams per kilogram of body weight (3.6 milligrams per pound) as a single oral dose.
(ii)
Conditions of use.
For treating breeding swine infected with the following nematodes: Large roundworms (
Ascaris suum
), nodular worms (
Oesophagostomum
spp.), lungworms (
Metastrongylus
spp.), intestinal threadworms (
Strongyloides ransomi
), and kidney worms (
Stephanurus dentatus
).
(iii)
Limitations.
May require retreatment in 4 to 5 weeks. Do not use within 11 days of slaughter for food. Consult your veterinarian for assistance before using in severely debilitated animals and in the diagnosis, treatment, and control of parasitism.
[47 FR 22517, May 25, 1982; 47 FR 30242, July 13, 1982, as amended at 48 FR 11429, Mar. 18, 1983; 51 FR 29215, Aug. 15, 1986; 67 FR 63055, Oct. 10, 2002; 78 FR 28823, May 20, 2014]
- Cross-references to the CFR
- 510.600556.350