08/06/2026
💪 We clarified the new USEF rule about ceterizine, but we can’t forget about Methocarbamol.
💪 What is methocarbamol?
Methocarbamol is a muscle relaxant commonly known as the brandname Robaxin. It is typically prescribed for tying-up (extertional rhabdomyolysis), back soreness, muscle pain and muscle spasms.
💪 Why is methocarbamol a regulated USEF medication?
Methocarbamol has properties as a central nervous system depressant. Meaning it can cause sedation and relaxation on the brain and spine. And the side effects of methocarbamol use can include lethargy, ataxia and muscle weakness. The USEF classifies methocarbamol as a Category I quantitatively restricted drug. This means that methocarbamol is permitted to be in the horse up to a certain plasma concentration at the time of testing.
💪 What is the current USEF guidance for methocarbamol in competition?
Per the USEF:
🚥 If you are giving methocarbamol ONLY, suggested withdrawal time is the same: 12 hours before competition.
❌If you are giving methocarbamol PLUS other medications or supplements, suggested withdrawal is now 24 hours before competition.
💪 Always check with your veterinarian and the USEF regarding medication use prior to and during competitions.
US Equestrian
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