What symptom in a client taking Nardil should be prioritized for assessment?

The symptom of a throbbing headache in a client taking Nardil, which is a monoamine oxidase inhibitor (MAOI), should be prioritized for assessment due to its potential association with hypertensive crisis. Nardil can interact with certain foods and medications, leading to elevated blood pressure levels, which may manifest as a severe headache. This is a critical consideration because a hypertensive crisis can be life-threatening if not addressed promptly.

In clients taking MAOIs, vigilance is required regarding symptoms that may indicate a potential medical emergency, such as significant headaches, which could signal dangerously high blood pressure. Prompt assessment and intervention are essential to prevent complications.

In contrast, while the other symptoms mentioned may warrant attention, they are typically less urgent in the context of a patient on Nardil. Constipation, feelings of muscle stiffness, or an elevated temperature could arise from less immediately threatening issues, but they do not carry the same level of risk as a throbbing headache, which might indicate a hypertensive emergency. Therefore, recognizing and addressing a throbbing headache in this scenario is crucial for the client's safety.