Clonidine-induced delayed gastric emptying persists despite prokinetic therapy in dogs fed a liquid meal as assessed by acetaminophen absorption.

Metoclopramide and azithromycin failed to reverse clonidine-induced delayed gastric emptying in healthy dogs.

This randomized crossover study evaluated the efficacy of metoclopramide and azithromycin in reversing clonidine-induced delayed gastric emptying (GE) in dogs, using the acetaminophen absorption test (AAT) as a non-invasive assessment tool. Eight healthy, intact female mixed-breed dogs received four treatments in random sequence: control, clonidine alone (0.03 mg/kg SC), clonidine plus azithromycin (4 mg/kg IV), and clonidine plus metoclopramide (0.5 mg/kg SC). Liquid-phase GE was assessed by measuring plasma acetaminophen concentrations via high-performance liquid chromatography across 11 time points following ingestion of a standardized liquid meal. Time to peak concentration (Tmax) served as the primary GE proxy. Clonidine significantly delayed GE, increasing mean Tmax from 80.6 ± 15.9 minutes (control) to 187.5 ± 53.8 minutes. Neither prokinetic agent reversed this delay at the dosages studied. The AAT demonstrated utility as a practical, minimally invasive method for quantifying liquid-phase GE in dogs, with potential clinical application in critically ill or postoperative patients where GE assessment is clinically relevant. Limitations include the use of healthy dogs rather than truly ill animals, a single liquid meal format, and specific dosing protocols that may not reflect all clinical scenarios. These findings suggest that clonidine-induced GE impairment may be resistant to conventional prokinetic therapy, which has important implications for patients receiving alpha-2 adrenergic agonists perioperatively or as sedatives.

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