StacksVerified U.S. regulatory reference

21 CFR §558.555

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Specifications. Type A medicated article containing:
    1. (1)22.7 grams (g) per pound (lb) (50 g/kilogram (kg)) semduramicin (as semduramicin sodium).
    2. (2)22.7 g/lb (50 g/kg) semduramicin (as semduramicin sodium biomass).
  2. (b)Sponsor. See No. 066104 in § 510.600(c) of this chapter for use of product described in paragraph (a)(1) of this section as in paragraph (d) of this section; for use of product described in paragraph (a)(2) of this section as in paragraph (e) of this section.
  3. (c)Related tolerances. See § 556.597 of this chapter.
  4. (d)Conditions of use in chickens. It is used in chicken feed as follows:
  5. (e)Conditions of use in chickens. It is used in chicken feed as follows:
  6. (f)Semduramicin may also be used in combination with virginiamycin as in § 558.635.