What is the most concerning adverse effect for a client receiving morphine?

• A. Nausea
• B. Sedation
• C. Respiratory Depression
• D. Itching

Answer: (C)

The main concept here is that opioids can suppress the brain’s breathing drive. Morphine acts on mu receptors in the brainstem and slows both the rate and depth of respiration. This can quickly become life-threatening, leading to dangerous drops in oxygen and even respiratory arrest if not identified and treated promptly. That potential for sudden, serious harm makes respiratory depression the most concerning adverse effect.

Nausea, itching, and sedation are common and uncomfortable but, while they require management (antiemetics, antihistamines, dose adjustments, and careful monitoring), they are generally not immediately life-threatening. The key to safety with morphine is careful dosing, monitoring of respiratory status (rate, depth, effort, and oxygenation), and readiness to reverse effects if needed with appropriate interventions and supportive care.