StacksVerified U.S. regulatory reference

21 CFR §520.1802c

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Specifications. Each fluid ounce contains 5 grams of piperazine-carbon disulfide complex and 0.83 gram of phenothiazine.
  2. (b)Sponsor. See No. 054771 in § 510.600(c) of this chapter.
  3. (c)Conditions of use in horses and ponies—(1) Amount. Administer 1 fluid ounce per 100 pounds of body weight by stomach tube or dose syringe after withholding feed overnight or for 8 to 10 hours.
    1. (2)Indications for use. For removing ascarids (large roundworms, Parascaris equorum), bots (Gastrophilus spp.), small strongyles, and large strongyles (Strongylus spp.).
    2. (3)Limitations. Do not use in horses intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian.