A patient admitted with paroxysmal supraventricular tachycardia requires medication. Which medication should the nurse prepare?

Adenosine is the appropriate medication to prepare for a patient experiencing paroxysmal supraventricular tachycardia (PSVT). This drug acts as a potent antidysrhythmic agent by slowing conduction through the atrioventricular (AV) node and can effectively terminate episodes of PSVT. When administered rapidly via IV push, adenosine can lead to a brief period of asystole or a noticeable decrease in heart rate, which often converts the rhythm back to sinus rhythm.

In the context of managing PSVT, the swift action of adenosine is crucial, as it is specifically indicated for this type of tachycardia. Other medications, while they may have uses in different arrhythmias or conditions, do not serve this immediate therapeutic purpose for PSVT.