The break from NSAIDs gave their preexisting ulcers time to heal, Mercer explained.Īnother plus is that acetaminophen does not accumulate in the horse’s body even after three weeks of twice-daily dosing. In fact, several horses in the study with gastric ulcers showed marked improvements after 21 days on acetaminophen. And while its anti-inflammatory effects are not on par with, say, phenylbutazone (bute), it’s more benign in the digestive tract. How exactly it works is still not yet fully understood, but it’s believed to impact the endocannabinoid, opioid, and serotonergic systems, in some of the same ways scientists believe cannibidiol (CBD) works, Mercer said. In less than an hour, its pain-relieving properties are already at work. One positive the researchers reconfirmed is that acetaminophen is readily and rapidly absorbed in the horse. ![]() Six horses were scoped for gastric ulcers, and six horses had their livers biopsied pre- and post-treatment to check for evidence of toxicity. Each horse was scored for lameness using body-mounted electronic sensors and human evaluators as they trotted in a straight line on pavement. They were withdrawn from any medications prior to beginning the study. All were healthy but exhibited mild, chronic lameness, for which most had routinely receive NSAIDS to remain comfortable. The latest trial included 12 therapy and lesson horses, ages 13-23, from the Ride-A-Rescue/Winterfrost Farm program. Mercer reported these findings at the 2021 American Association of Equine Practitioners Convention, held Dec. The research builds on an earlier study that showed acetaminophen was safe for horses at 20 milligrams per kilogram of body weight twice daily for two weeks. In practical terms, this is approximately 15,000 milligrams for an 1,100-pound horse (30 500-milligram tabs) given at 12-hour intervals. ACVIM- LA, a resident who is working toward a PhD in veterinary clinical pharmacology at the Virginia-Maryland College of Veterinary Medicine, in Blacksburg, Virginia, concluded that 30 milligrams per kilogram of body weight of acetaminophen twice daily for 21 days produced no ill effects. The study, led by Melissa Mercer, DVM, Dipl. Researchers confirmed that acetaminophen is safe for horses at a higher dose than tested previously, even when administered for weeks at a time. Acetaminophen is a cheap and effective over-the-counter pain reliever that provides an alternative to non-steroidal anti-inflammatory drugs (NSAIDS) with undesirable side effects such as gastric ulcers and kidney damage.
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