Which route is NOT typically available for ondansetron in EMS standing orders?

• A. Intramuscular injection
• B. Oral
• C. Intravenous
• D. Dissolving sublingual tablet

Answer: (A)

Ondansetron is a serotonin 5-HT3 receptor antagonist used to treat nausea and vomiting. In EMS standing orders, the routes typically approved are oral dissolving tablets or liquids and intravenous administration, because these provide reliable absorption and quick, controllable onset in the field. Intramuscular injection is not commonly included because it offers neither a faster onset nor more reliable absorption than IV or oral routes, and it adds method-related challenges and discomfort for patients. Therefore, the intramuscular route is not typically available for ondansetron in EMS standing orders.