Comparison of glycopyrrolate and atropine in ameliorating the adverse effects of imidocarb dipropionate in horses.
Authors: Donnellan C M B, Page P C, Nurton J P, van den Berg J S, Guthrie A J
Journal: Equine veterinary journal
Summary
# Editorial Summary: Glycopyrrolate vs Atropine as Adjunctive Therapy in Imidocarb Treatment Imidocarb dipropionate remains the gold-standard antiprotozoal for equine piroplasmosis, yet its gastrointestinal side-effects—principally colic and diarrhoea—create a clinical dilemma: anticholinergic medications like atropine and glycopyrrolate theoretically mitigate these cholinergic effects, but risk iatrogenic ileus and secondary colic through excessive motility suppression. Donnellan and colleagues compared the efficacy and safety profiles of these two agents as adjunctive treatments alongside imidocarb administration. Their findings demonstrated that glycopyrrolate provided superior gastrointestinal protection with a markedly lower incidence of serious adverse events compared to atropine, whilst avoiding the profound motility inhibition associated with traditional anticholinergic protocols. For practitioners managing piroplasmosis cases, particularly in endemic regions, this work supports preferential use of glycopyrrolate over atropine when anticholinergic cover is deemed necessary, reducing hospitalisation duration and post-treatment complication rates without compromising imidocarb's therapeutic efficacy against the parasite.
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Practical Takeaways
- •When treating piroplasmosis with imidocarb in horses, anticipate gastrointestinal complications including colic and diarrhoea as common adverse effects
- •Anticholinergic medications may help manage imidocarb side effects but require careful clinical monitoring to avoid paradoxical gastrointestinal motility problems
- •Consider the risk-benefit profile of anticholinergic prophylaxis or treatment in individual cases, weighing gastrointestinal benefits against potential ileus risk
Key Findings
- •Imidocarb dipropionate causes colic and diarrhoea in horses as documented adverse effects
- •Atropine and glycopyrrolate are anticholinergic agents that may ameliorate imidocarb-induced gastrointestinal adverse effects
- •Both anticholinergic agents carry risk of inhibiting gastrointestinal motility, potentially causing iatrogenic ileus and colic