Pharmacological Management of Pain in Equine Medicine
Summary
Pain control in horses is a cornerstone of welfare and clinical practice, encompassing acute postoperative discomfort, chronic orthopaedic conditions and visceral pain syndromes such as colic. Pharmacological strategies chiefly rely on non-steroidal anti-inflammatory drugs (NSAIDs), which modulate inflammatory cascades via cyclooxygenase (COX) inhibition, and on adjunctive agents including opioids, alpha2-adrenergic agonists and local anaesthetics. Choice of agent, route and dosing schedule must balance analgesic efficacy against adverse effects such as gastrointestinal ulceration, right dorsal colitis and renal compromise. Recent advances have focused on highly selective COX-2 inhibitors to spare protective COX-1 activity, novel delivery systems to prolong therapeutic concentrations and combination protocols to target both nociceptive and inflammatory components of pain. Equally, understanding species-specific pharmacokinetic and pharmacodynamic profiles has informed withdrawal times in performance horses and mitigated risks of residual drug exposure. Overall, the field is evolving towards precision analgesia, integrating drug selection with individual patient factors, surgical and medical contexts, and long-term safety considerations.
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Pharmacological Management of Pain in Equine Medicine publication trend
The graph below shows the total number of articles in pharmacological management of pain in equine medicine across all publications each year (not limited to Nature Index journals).
Technical terms
Non-steroidal anti-inflammatory drug (NSAID): A class of analgesic and anti-inflammatory agents that inhibit cyclooxygenase enzymes, reducing prostaglandin synthesis.
Cyclooxygenase (COX): Enzymes (COX-1 and COX-2) responsible for converting arachidonic acid into prostaglandins, key mediators of inflammation and pain.
Pharmacokinetics: The study of drug absorption, distribution, metabolism and excretion that determines concentration–time profiles in the body.
Pharmacodynamics: The analysis of a drug’s biochemical and physiological effects, including mechanism of action and relationship between concentration and effect.
Bioavailability: The proportion of an administered dose that reaches systemic circulation intact, influencing efficacy and dosage requirements.
Elimination half-life: The time required for plasma drug concentration to decrease by half, guiding dosing intervals and steady-state achievement.
References
- Non-Steroidal Anti-Inflammatory Drugs and Associated Toxicities in Horses. Animals (2022).
- Synopsis of the pharmacokinetics, pharmacodynamics, applications, and safety of firocoxib in horses. Veterinary and Animal Science (2023).
- Hematological and Biochemical Effects Associated with Prolonged Administration of the NSAID Firocoxib in Adult Healthy Horses. Veterinary Sciences (2024).
- Medication control of flunixin in racing horses: Possible detection times using Monte Carlo simulations. Equine Veterinary Journal (2021).
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