CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER E—ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS (parts 500 to 590) > PART 524—OPHTHALMIC AND TOPICAL DOSAGE FORM NEW ANIMAL DRUGS > 524.900—Famphur.

524.900—Famphur.

(a) Chemical name. O,O- Dimethyl O- [p- (dimethylsulfamoyl)phenyl] phosphorothioate.
(b) Specifications. The drug is in liquid form containing 13.2 percent famphur.
(c) Sponsor. See Nos. 000061 and 051311 in § 510.600(c) of this chapter.
(d) Special considerations. Do not use on animals simultaneously or within a few days before or after treatment with or exposure to cholinesterase-inhibiting drugs, pesticides, or chemicals.
(e) Related tolerances. See § 556.273 of this chapter.
(f) Conditions of use. (1) The drug is used as a pour-on formulation for the control of cattle grubs and to reduce cattle lice infestations.
(2) It is used at the rate of 1 ounce per 200 pounds body weight, not to exceed a total dosage of 4 ounces, applied from the shoulder to the tail head as a single treatment. It is applied as soon as possible after heel fly activity ceases. Do not use on lactating dairy cows or dry dairy cows within 21 days of freshening, calves less than 3 months old, animals stressed from castration, over-excitement or dehorning, sick or convalescent animals. Animals may become dehydrated and under stress following shipment. Do not treat until they are in good condition. Brahman and Brahman crossbreeds are less tolerant of cholinesterase-inhibiting insecticides than other breeds. Do not treat Brahman bulls.
(3) Do not slaughter within 35 days after treatment. Swine should be eliminated from area where run-off occurs.

Code of Federal Regulations

[40 FR 13873, Mar. 27, 1975, as amended at 49 FR 34352, Aug. 30, 1984; 57 FR 7652, Mar. 4, 1992; 59 FR 28769, June 3, 1994; 62 FR 55161, Oct. 23, 1997; 62 FR 61626, Nov. 19, 1997; 69 FR 41427, July 9, 2004]