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. Muscle pain is not a common adverse effect of verapamil, a calcium channel blocker. B. Hyperthermia is not associated with verapamil use. C. Hypotension is a common adverse effect of IV verapamil due to its vasodilating and negative inotropic effects, especially when given rapidly. The nurse should closely monitor blood pressure during and after administration. D. Ototoxicity is not linked to verapamil; it is more commonly associated with medications like aminoglycosides or loop diuretics.