A client on a psychiatric care unit has muscle spasms in the neck, stiffness in other muscles, and the eyes are rolling upward. The client had two PRN doses of haloperidol in the last 6 hours. Of the...

A client on a psychiatric care unit has muscle spasms in the neck, stiffness in other muscles, and the eyes are rolling upward. The client had two PRN doses of haloperidol in the last 6 hours. Of the drugs that have been prescribed for the client as needed (see chart), the nurse should administer:

1. Lorazepam.

2. Amantadine.

3. Diphenhydramine.

4. Benztropine.