A nurse is preparing to administer verapamil by IV bolus to a client who is having cardiac dysrhythmias. For which of the following adverse effects should the nurse monitor when giving this medication?

A. Hyperthermia: Verapamil does not typically cause elevated body temperature. Monitoring for fever is not a primary concern when administering this medication intravenously. B. Hypotension: Verapamil is a calcium channel blocker that can cause vasodilation and negative inotropic effects, leading to decreased blood pressure. Continuous monitoring of vital signs during IV administration is essential to detect and manage hypotension promptly. C. Ototoxicity: Ototoxicity is not associated with verapamil. Hearing loss or tinnitus is not a known adverse effect, so specific auditory monitoring is unnecessary. D. Muscle pain: Muscle pain is not a common side effect of verapamil. While patients may experience general fatigue, myalgia is not a primary concern related to this medication.