Adverse Effects of Beta-Blockers

In this pharmacology question, we are asked to identify a common adverse effect associated with beta-blockers, specifically using propranolol as an example.

Beta-blockers like propranolol work by blocking the effects of epinephrine and norepinephrine on beta-adrenergic receptors throughout the body.

Let's consider the heart. Propranolol blocks the beta-one receptors in the heart tissue. Since these receptors normally increase heart rate and contractility, blocking them leads to a slowing of the heart rate.

Now, let's look at our options. Option A is bradycardia. Bradycardia is defined as a heart rate that is slower than normal, typically below sixty beats per minute.

This matches the expected physiological effect of decreasing the heart rate. Let's briefly look at the other options to be sure.