Evaluation of Ropinirole versus Apomorphine for Emesis Induction in Dogs

Area of Science:

• Veterinary Emergency Medicine
• Toxicology
• Pharmacology

Background:

• Inducing emesis is crucial for gastric decontamination in dogs following toxic ingestions.
• Ropinirole (ROP) eye drops and intravenous apomorphine (APO) are potential emetic agents used in veterinary emergency medicine.
• Comparative efficacy and safety data for these agents are essential for clinical decision-making.

Purpose of the Study:

• To compare the emetic efficacy of ROP eye drops versus IV APO in dogs presenting with foreign material ingestion.
• To evaluate and compare the adverse effects associated with ROP and APO administration.
• To determine the optimal emetic agent for emergency gastric decontamination in canine patients.

Main Methods:

• A prospective, randomized clinical trial was conducted involving 132 client-owned dogs with suspected foreign material ingestion.
• Dogs were randomly assigned to receive either ROP eye drops or IV APO for emesis induction.
• Efficacy outcomes included first-dose success, time to emesis, and need for rescue antiemetics; adverse events and vital signs were monitored.

Main Results:

• Apomorphine (APO) achieved a significantly higher first-dose success rate (99%) compared to ropinirole (ROP) (81%) (P < 0.001).
• The median time to first emesis was markedly shorter with APO (1.6 min) than with ROP (8.6 min) (P < 0.001).
• Rescue antiemetic therapy was required in 37% of ROP-treated dogs, versus none in the APO group (P < 0.001); minor adverse events were more frequent with ROP.

Conclusions:

• Intravenous apomorphine (APO) is a clinically superior emetic agent compared to ropinirole (ROP) eye drops for emergency gastric decontamination in dogs.
• APO demonstrates faster onset, higher efficacy, and a lower incidence of protracted vomiting requiring intervention.
• ROP eye drops were associated with lower success rates, delayed emesis, and a higher frequency of minor adverse events and protracted vomiting.