Which potential effect should the nurse inform a client receiving metoprolol about?

When a nurse informs a client about the potential effects of metoprolol, it is important to recognize that metoprolol is a beta-blocker commonly prescribed to manage high blood pressure and certain heart conditions. One known side effect of beta-blockers, including metoprolol, is that they can cause dizziness, especially during strenuous activity. This occurs because the medication can reduce the heart rate and the heart's response to exercise, which may result in decreased blood flow and oxygen delivery to the muscles, leading to sensations of dizziness or lightheadedness when engaging in physical exertion.

Dizziness can be particularly significant during activities that are more demanding, as the body typically requires a greater increase in heart rate and blood pressure to meet the increased demand for oxygen. Metoprolol's action of blocking the beta-adrenergic receptors can inhibit this normal physiological response. Therefore, it is essential for the nurse to advise the client to be cautious with strenuous activities and to monitor for any symptoms of dizziness, ensuring they understand how to manage their condition while taking the medication.