Equioxx (firocoxib) is an NSAID, also sold as Equioxx, Previcox. Below: how 9 show and racing governing bodies list it, every published detection time for the dose and route studied, and the document and page each value comes from.USEF: Restricted: dose and time limitsFEI: Controlled Medication, detection time 336 h (14 days)HISA/HIWU: detection time 360 h (15 days)named in the rules of 14 state racing commissions
Each row is one study the governing body published: its own dose, route and formulation. A different dose or route was not studied, and the body says so.
| Body and document | Dose and route studied | Formulation | Horses | Detection time |
|---|---|---|---|---|
| FEI 2024 (16 December 2024) p. 2 | 0.1mg/kg s.i.d for 5-14 doses · oral | Equioxx | 336 h (14 days) | |
| HISA / HIWU Last updated on December 8th, 2023 p. 11 | 100 mcg/kg orally once daily for total of 7 doses · oral | 20 | 360 h (15 days) plasma | |
| HISA / HIWU 080624 p. 3 | 100 mcg/kg orally once daily for total of 7 doses · oral | 20 | 360 h (15 days) plasma |
Transcribed from the governing bodies' own documents. Each entry links to the document and quotes the row it came from.
“Firocoxib Equioxx® 0.1 mg/kg (0.0455 mg/Lb) (45.5 mg/1000Lb) >12 hours Oral NSAID” — source p. 10
“CONTROLLED Firocoxib Non-steroidal anti-inflammatory” — source p. 17
“FIROCOXIB4 Equioxx 0.1mg/kg s.i.d for oral 5-20 in 4 336 (14d) 5-14 doses different studies” — source p. 2
From 2027-01-01: 2027 Equine Prohibited Substances List p. 17 lists it as Controlled Medication.
“The maximum permissible plasma or serum concentration of firocoxib is 0.24 micrograms per milliliter.” — source p. 9
“VIO405.7 Firocoxib (Equioxx) (an NSAID) - The maximum permitted ... No part of a dose should be administered during the 12 hours prior to competition.” — source p. 47
“7. Firocoxib (Equioxx) (a NSAID)” — source p. 78
“Firocoxib ... Permitted ... The maximum permitted plasma concentration is 0.057 mg/lb (57 mg/1,000 lbs)” — source
“1. By tablet: One (1) 57mg tablet administered orally” — source p. 10
“Firocoxib2 ... 100 mcg/kg orally once daily for total of 7 doses ... 360 hours (20) ... 2 ng/mL in serum or plasma” — source p. 3
“Firocoxib ... 360 hours: 100 mcg/ kg orally once daily for total of 7 doses. (20 horses) ... 2 ng/mL in serum or plasma” — source p. 11
“Firocoxib 4 C” — source p. 29
Equioxx is named in the medication rules, threshold schedules or withdrawal guidance of 14 state racing commissions: Arizona, Colorado, Florida, Illinois, Kentucky, Louisiana, Maine, Minnesota, New York, Ohio, Oklahoma, Pennsylvania, Washington, West Virginia. Most states publish thresholds (concentrations), not times, and several adopt the ARCI schedule by reference. ShowSafe Pro Racing layers each state's rules over HISA or ARCI the way that state applies them, for all 32 states with live pari-mutuel racing.
A published detection time tells you how long Equioxx stayed detectable in a handful of horses given one dose by one route. It does not tell you when your horse is clear: a bigger dose, a different route, repeated doses, a joint injection or a slower horse all push the real figure out, and every governing body says to add a safety margin set by your veterinarian. Here is how to read the rulebook.
ShowSafe Pro takes the doses already logged for your horse, matches each one to the published row for that dose and route, adds the margin your vet set, and flags anything the studies never covered as Unknown, ask your vet instead of guessing. Every answer shows the document, page and line it came from, for every rulebook the show runs under.
The 2026 USEF Guidelines & Rules for Drugs and Medications (with 27 Jul 2026 Guidelines Update) list Equioxx as "Restricted Medication Dose and Time Recommendations". Maximum dose: 0.1 mg/kg (0.0455 mg/Lb) (45.5 mg/1000Lb) each 24 hours. Not within 12 h of competition. Screening limit 0.240 micrograms per milliliter in plasma. (Page 10.)
The FEI List of Detection Times gives 336 h (14 days) for 0.1mg/kg s.i.d for 5-14 doses oral (Equioxx). On the 2026 FEI Equine Prohibited Substances List Equioxx is a Controlled Medication. The FEI states that a detection time is not a withdrawal time; the treating veterinarian adds a safety margin.
HIWU's published detection time for Equioxx is 360 h (15 days) for 100 mcg/kg orally once daily for total of 7 doses (20 horses), screening limit 2 ng/mL in serum or plasma. A detection time is not a withdrawal time; HISA leaves the safety margin to your veterinarian.
No. It is the approximate time Equioxx stayed detectable in the horses studied, at that dose and route. Your horse, dose, route and number of doses may differ. Every governing body tells you to add a safety margin set by your veterinarian, and none publishes a withdrawal time. ShowSafe Pro applies the published row for the dose and route you actually gave, adds your vet's margin, and says 'Unknown' when the studies do not cover what you gave.