Which severe pain medication has a no-repeat dose in its protocol?

• A. Fentanyl
• B. Morphine
• C. Hydromorphone
• D. Ketamine

Answer: (D)

The main idea here is that some pain medications in prehospital protocols are allowed to be given more than once to control lasting pain, while others are restricted to a single dose per episode.

Ketamine is designed to provide rapid analgesia at subdissociative doses, but in many SNHD protocols it is given as a single administration with no repeat dose for the same pain episode. This restraint helps avoid cumulative effects such as dissociation, agitation, hypertension, and airway secretions, and keeps care simpler and safer in the field where monitoring is limited.

The other agents listed—fentanyl, morphine, and hydromorphone—are opioids with dosing guidelines that routinely permit repeat doses if pain persists and the patient remains stable. They are titratable, with clear intervals and maximum totals to prevent respiratory compromise, making repeated administration appropriate within the protocol.

So, ketamine is the one with a no-repeat-dose restriction in this protocol because of safety considerations tied to its significant dissociative effects and profile in the prehospital setting.