[Code of Federal Regulations]
[Title 21, Volume 6]
[Revised as of April 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR524.900]

[Page 299]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 524_OPHTHALMIC AND TOPICAL DOSAGE FORM NEW ANIMAL DRUGS--Table of Contents
 
Sec. 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 060594 in Sec. 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 Sec. 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.

[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]