After the administration of haloperidol (Haldol), a nurse should monitor closely for

Haloperidol

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Haloperidol has a known side effect of prolonging the QT interval, which can lead to cardiac dysrhythmias123. Therefore, after the administration of haloperidol, it is important for a nurse to monitor for a prolonged QT interval and cardiac dysrhythmias123. This is why continuous cardiac monitoring is recommended if repeated doses are given1.