A 52-year-old female with a history of bipolar I disorder is brought to the inpatient psychiatric unit after being found mute, immobile, and refusing food for 3 days. On examination, she exhibits waxy flexibility, staring, posturing, and negativism. Her Bush-Francis Catatonia Rating Scale score is 22. Vital signs reveal a temperature of 99.8 F, heart rate of 102, and blood pressure of 148/92. Laboratory findings show a CK of 580 U/L and a WBC of 11,200. The treatment team has confirmed the diagnosis of catatonia. What is the most appropriate initial treatment plan?