N.Y. Comp. Codes R. & Regs. tit. 9, § 4236.2
(a) The following substances are permitted to be used at any time up to race time:
(2) antibiotics, vitamins, electrolytes, and other food supplements as long as they are administered orally and as long as they do not contain any other drug.
(b) Eligibility for the administration of furosemide.
(1) The administration of furosemide is permissible to a horse which has qualified for its use by any of the following means:
(2) If it is determined that a horse has qualified pursuant to paragraph (1) of this subdivision, and the owner or trainer elects to make the horse eligible for the administration of furosemide, the horse shall be placed on a list of horses that have bled, to be maintained by the association veterinarian and shall not be permitted to race for the following periods of time: Such list shall be made available to the public for inspection.
(d) The following substances are permitted to be administered by any means until 48 hours before the start of a racing program:
(18) biologics (e.g., bacterins, antitoxins except tetanus antitoxin).
They may not be administered within 48 hours of the start of a racing program. In this regard, substances ingested by a horse shall be deemed administered at the time of eating and drinking. It shall be part of the trainer's responsibility to prevent such ingestion within such 48 hours.
(e) The following substances may be administered by any means until 72 hours before the start of a racing program:
(6) xylazine (e.g., Rompun).
They may not be administered by any means within 72 hours of the start of a racing program. In this regard, substances ingested by a horse shall be deemed administered at the time of eating and drinking. It shall be part of the trainer's responsibility to prevent such ingestion within such 72 hours.
Drugs and medications are permitted to be used only in accordance with the following provisions: