§ 520.2455 Tiamulin.

Specifications.(a) (1) Each gram of soluble powder contains 450 milligrams (mg) tiamulin hydrogen fumarate.

(2) Each milliliter (mL) of solution contains 125 mg (12.5 percent) tiamulin hydrogen fumarate.

(3) Each mL of solution contains 123 mg (12.3 percent) tiamulin hydrogen fumarate.

Sponsors.(b) See sponsor numbers in § 510.600(c) of this chapter for use as in paragraph (d) of this section.

(1) No. 058198 for products described in paragraph (a) of this section.

(2) No. 066104 for products described in paragraphs (a)(1) and (3) of this section.

(3) Nos. 016592, 051072, 051311, and 061133 for product described in paragraph (a)(2) of this section.

Related tolerances.(c) See § 556.732 of this chapter.

Conditions of use in swineAmounts and indications for use.(d) —(1) Administer in drinking water for 5 consecutive days:

Brachyspira hyodysenteriae(i) 3.5 mg per (/) lb of body weight daily for treatment of swine dysentery associated with susceptible to tiamulin.

Actinobacillus pleuropneumoniae(ii) 10.5 mg/lb of body weight daily for treatment of swine pneumonia due to susceptible to tiamulin.

Limitations.(2) Use as only source of drinking water. Prepare fresh medicated water daily. Withdraw medication 3 days before slaughter following treatment at 3.5 mg/lb and 7 days before slaughter following treatment at 10.5 mg/lb of body weight. Swine being treated with tiamulin should not have access to feeds containing polyether ionophores (e.g., lasalocid, monensin, narasin, salinomycin, or semduramicin) as adverse reactions may occur. The effects of tiamulin on swine reproductive performance, pregnancy, and lactation have not been determined.

[70 FR 75017, Dec. 19, 2005, as amended at 74 FR 7180, Feb. 13, 2009; 75 FR 54492, Sept. 8, 2010; 77 FR 56770, Sept. 14, 2012; 78 FR 17596, Mar. 22, 2013; 80 FR 13229, Mar. 13, 2015; 85 FR 18119, Apr. 1, 2020; 87 FR 17945, Mar. 29, 2022; 87 FR 58962, Sept. 29, 2022; 90 FR 40970, Aug. 22, 2025]