Which common adverse drug reaction is associated with Atenolol?

Atenolol, a cardioselective beta-1 adrenergic antagonist, is commonly associated with adverse drug reactions that impact heart rate and rhythm. Bradyarrhythmias, which are defined as slower than normal heart rates and can include various forms of abnormal heart rhythms, occur due to the medication's mechanism of action in blocking beta-1 receptors in the heart. This leads to decreased heart rate and contractility, which is beneficial for the treatment of conditions like hypertension and angina but can also result in bradyarrhythmias as a side effect.

The other options listed typically do not have a well-established connection with Atenolol. Increased appetite is not commonly reported with beta blockers; rather, some might experience weight gain over long-term use. Nausea may occur with a variety of medications but is not specifically linked to Atenolol as a frequent adverse reaction. Rash can occur with many drugs, but it's more commonly associated with allergic reactions rather than a direct effect of the medication. Therefore, bradyarrhythmias stand out as a well-documented side effect of Atenolol, aligning directly with its pharmacological action.