What would be the best way to explain to a patient on a morphine PCA without a basal infusion rate who is afraid of overdosing?

The most effective way to address a patient’s fear of overdose while using a morphine patient-controlled analgesia (PCA) system, especially one without a basal infusion rate, is to explain that the device provides a small dose of medication only when the patient actively pushes the trigger button and only if it has been an appropriate amount of time since the last dose was given.

This mechanism of the PCA allows the patient to have control over their pain management while ensuring safety. It reassures patients that they will receive medication only when they need it, rather than receiving constant doses that might lead to a higher risk of overdose. The system typically includes built-in safeguards that limit the amount administered within a specific time frame, further reducing the likelihood of receiving an excessive dose at once.

By emphasizing that the patient can control when they receive medication based on their personal needs and the system's safety features, this explanation can help alleviate anxiety about overdosing.