A patient diagnosed with mitral valve prolapse was given quinidine intravenously for an arrhythmia. The nurse understands that the patient is experiencing a common adverse reaction to this drug when:

The patient is having frequent watery diarrhea


•Common side effects of quinidine include diarrhea (35%), stomach cramping (22%), lightheadedness (15%), nausea, vomiting, and QTc prolongation.

•Less common side effects (<10%) include tinnitus, back pain, muscle weakness, rash, syncope, and palpitations.

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