StacksVerified U.S. regulatory reference

21 CFR §558.364

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Specifications. A fixed-ratio, combination drug Type A medicated article containing 36 grams narasin and 36 grams nicarbazin per pound.
  2. (b)Sponsor. See No. 058198 in § 510.600(c) of this chapter.
  3. (c)Tolerances. See §§ 556.428 and 556.445 of this chapter.
  4. (d)Conditions of use. It is used as follows:
    1. (1)Chickens—
    2. (2)Narasin and nicarbazin fixed-ratio, combination drug Type A medicated articles may also be used in combination with:
      1. (i)Avilamycin as in § 558.68.
      2. (ii)Virginiamycin as in § 558.635.