A resident taking quinidine may experience which of the following adverse effects?

Quinidine is an antiarrhythmic medication used primarily to treat irregular heartbeats by helping to stabilize the heart's rhythm. As a result of its effects on the cardiovascular system, one of the notable adverse effects that patients may experience includes postural hypotension, which refers to a significant drop in blood pressure when transitioning from lying down to a standing position. This can lead to symptoms such as dizziness and lightheadedness.

Additionally, quinidine can lead to bradycardia, or a slower than normal heart rate, which is captured here as a slow pulse. The combination of these effects can contribute to low blood pressure and a slow heart rate, making this answer particularly relevant to the medication’s pharmacological profile.

Other potential side effects associated with quinidine may include gastrointestinal disturbances and visual changes, but these are less directly related to the primary cardiovascular effects described in the correct answer. Understanding these specific potential adverse effects is crucial for medication management and monitoring in patients taking quinidine.