Section 520.955 - Florfenicol(a)Specifications. Each milliliter (mL) contains 23 milligrams (mg) florfenicol.(b)Sponsors. See Nos. 000061, 054925, and 058198 in § 510.600(c) of this chapter.(c)Related tolerances. See § 556.283 of this chapter.(d)Conditions of use in swine - (1)Amount. Administer in drinking water ad libitum at 400 mg per gallon (100 parts per million (ppm)) for 5 consecutive days.(2)Indications for use. For the treatment of swine respiratory disease (SRD) associated with Actinobacillus pleuropneumoniae, Pasteurella multocida, Salmonella choleraesuis and Streptococcus suis.(3)Limitations. Do not slaughter within 16 days of last treatment. Federal law restricts this drug to use by or on the order of a licensed veterinarian.67 FR 78357, Dec. 24, 2002, as amended at 72 FR 262, Jan. 4, 2007; 78 FR 52854, Aug. 27, 2013; 82 FR 12169, Mar. 1, 2017