For how many minutes should a nurse monitor a patient for an immediate allergic reaction after medication administration?

The most appropriate duration for monitoring a patient for an immediate allergic reaction after medication administration is usually 20-30 minutes. This time frame is critical because immediate allergic reactions, such as anaphylaxis, can occur quickly after exposure to a medication, often within minutes. Monitoring during this timeframe allows healthcare providers to identify any signs of an allergic response, such as difficulty breathing, swelling, hives, or changes in vital signs, which can escalate rapidly and require prompt intervention.

Option C aligns with guidelines that suggest closely observing patients for at least 20 minutes to ensure early detection and management of any adverse reactions. The other options, while they may encompass periods of monitoring, do not emphasize the urgency typically associated with the initial 20-30 minutes following medication administration, which is a key window for identifying immediate allergic responses.