CFR

520.1242b—Levamisole hydrochloride tablet or oblet (bolus).

(a) Chemical name. (-)-2,3,5,6-Tetrahydro-6-phenylimidazo [2,1-b] thiazole monohydrochloride.

(b) Specifications. Assay of not less than 98 percent by nonaqueous titration with 0.1 N potassium isopropoxide; 1 isomer minimum 95 percent pure by optical rotation.

(d) Required labeling. Consult your veterinarian for assistance in the diagnosis, treatment, and control of parasitism.

(e) Related tolerances. See § 556.350 of this chapter.

(f) Conditions of use. (1) It is used in an oblet for cattle as follows:

(i) Amount. 2.19 grams per oblet.

(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. Administer as a single dose as follows: 250 to 450 pounds, 1/2 oblet; 450 to 750 pounds, 1 oblet; and 750 to 1,050 pounds, 1 1/2 oblets; conditions of constant helminth exposure may require re-treatment within 2 to 4 weeks after the first treatment; do not slaughter for food within 48 hours of treatment; not for use in dairy animals of breeding age; consult veterinarian before using in severely debilitated animals.

(2) It is used in a tablet for sheep as follows:

(i) Amount. 0.184 gram per tablet.

(iii) Limitations. Administer one tablet for each 50 pounds of body weight; conditions of constant helminth exposure may require re-treatment within 2 to 4 weeks after the first treatment; do not slaughter for food within 72 hours of treatment; consult a veterinarian before using in severely debilitated animals.

Code of Federal Regulations

[40 FR 13838, Mar. 27, 1975, as amended at 44 FR 59507, Oct. 16, 1979; 62 FR 61625, Nov. 19, 1997; 67 FR 63055, Oct. 10, 2002]

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