What potential adverse reaction should patients be aware of when taking Verapamil?

When taking Verapamil, one potential adverse reaction that patients should be aware of is bradycardia. Verapamil is a calcium channel blocker that can slow down the heart rate by inhibiting calcium ions from entering the cardiac muscle and the conduction tissues in the heart. This action can lead to a decrease in heart rate, which is known as bradycardia. Patients experiencing bradycardia may feel symptoms such as dizziness, fatigue, or fainting.

Understanding the mechanism through which Verapamil works is key to recognizing why bradycardia is a significant concern. While it is effective in treating conditions like hypertension and angina, the impact on heart rate necessitates monitoring, particularly in patients who may have pre-existing heart conditions. The awareness of this potential side effect allows both patients and healthcare providers to manage and adjust dosages or treatments as necessary for safety.