21 CFR §520.1802a

1. (a)Specifications. Each fluid ounce of suspension contains 7.5 grams of piperazine-carbon disulfide complex. The piperazine-carbon disulfide complex contains equimolar parts of piperazine and carbon disulfide (1 gram contains 530 mgs of piperazine and 470 mgs of carbon disulfide).
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, large strongyles (Strongyles spp.), and pinworms (Oxyuris equi).
   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.