Stat Dose of Quetiapine for Acute Agitation

Recommended Dosing Strategy

The American College of Oncology recommends an initial stat dose of quetiapine 25 mg PO for acute agitation or severe psychosis, with repeat dosing every 12 hours as needed 1
For elderly or frail patients, the recommended dose is 25 mg PO, recognizing this population requires dose reduction 1
For patients with hepatic impairment, the recommended dose is 25 mg PO with caution and reduced subsequent doses 1

The American College of Emergency Physicians recommends benzodiazepines (lorazepam 1-2 mg IM/IV or midazolam 2.5 mg IM/IV) or conventional antipsychotics (haloperidol 5 mg IM or droperidol 5 mg IM) as first-line monotherapy for undifferentiated acute agitation, with Level B evidence 2, 3, 4, 5
For cooperative patients accepting oral medications, a combination of lorazepam 2 mg PO and risperidone is specifically recommended 2, 3, 4, 5

Quetiapine 25 mg PO may be appropriate as a second-line option for patients with known psychiatric illness already stabilized on quetiapine who develop mild agitation 1
Quetiapine 25 mg PO may be considered for delirium management in cancer patients when first-line agents are contraindicated 1
Quetiapine has a lower risk of extrapyramidal side effects compared to typical antipsychotics, making it a consideration for patients who cannot tolerate these side effects 1

Monitor closely for orthostatic hypotension and dizziness, checking blood pressure before and after administration 1
Monitor for oversedation, particularly in elderly patients 1
Monitor for QTc prolongation, though it is less problematic than with some alternatives 1
Dose adjustments are required for elderly patients, hepatic impairment, and renal impairment 1

The first attempt for rapid control should be haloperidol 5 mg IM or lorazepam 1-2 mg IM 2, 3, 4, 5
If the oral route is preferred and the patient is cooperative, consider lorazepam 2 mg PO + risperidone 0.5 mg PO 2, 3, 4, 5
If EPSE risk is prohibitive and the oral route is required, consider quetiapine 25 mg PO, but expect a slower onset and monitor for orthostasis 1