StacksVerified U.S. regulatory reference

21 CFR §558.633

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Specifications. Type A medicated articles containing 77.12 grams tylvalosin per pound as tylvalosin tartrate.
  2. (b)Sponsor. See No. 066916 in § 510.600(c) of this chapter.
  3. (c)Related tolerances. See § 556.748 of this chapter.
  4. (d)Special considerations.
    1. (1)Federal law restricts medicated feed containing this veterinary feed directive (VFD) drug to use by or on the order of a licensed veterinarian. See § 558.6 for additional requirements.
    2. (2)VFDs for tylvalosin shall not be refilled.
    3. (3)Crumbled Type C medicated feeds must bear an expiration date of 7 days after the date of manufacture.
  5. (e)Conditions of use.