What medications, doses, and frequencies are recommended for treating agitation?

Medication for Agitation: Doses and Frequencies

For older adults (≥65 years) with severe agitation, oral quetiapine has the best safety profile, while midazolam should be avoided due to elevated risk of serious adverse events without efficacy gains. 1

Recommended Medications by Route and Population

Oral Medications (Preferred First-Line)

Oral medications should be offered first when patients can cooperate, as they demonstrate equivalent time to adequate sedation (15 minutes) compared to intramuscular routes but align with best-practice guidelines 2.

• Quetiapine: Best safety profile among reported medications for older adults 1

  • Starting dose: 50 mg every 12 hours
  • Can increase by 50 mg if additional haloperidol doses needed in previous 24 hours 3
  • May reduce duration of delirium when added to haloperidol 3

• Olanzapine: Effective but causes more sedation than aripiprazole 4

  • Commonly used in emergency settings 2
  • Well-tolerated in pediatric populations (18.1% of doses) 5

• Lorazepam: Effective with fewer side effects than antipsychotics 4

  • Critical caveat: Increased risk of adverse events with escalating doses 1
  • Enhanced efficacy when combined with antipsychotics 4
  • Commonly used (19% of doses in pediatric settings) 5

Intramuscular/Intravenous Medications

Use when oral route fails or patient cannot cooperate safely.

• Ziprasidone (IM): Faster onset and better tolerated than haloperidol 4

• Droperidol: As effective as olanzapine but provides faster sedation 4

  • Dose-response signal: Increased adverse events with escalating doses (though not statistically significant) 1

• Haloperidol:

  • Requires fewer additional doses than some alternatives 4
  • Less effective at 60 minutes compared to some options 4
  • Combination approach: Haloperidol + promethazine effectively reduces aggression with lower adverse effects 4
  • Avoid in patients at risk for torsades de pointes (baseline QT prolongation, concurrent QT-prolonging medications, history of arrhythmia) 3

Inhaled Medications

• Loxapine 10 mg (inhaled): Superior to 5 mg dose, provides rapid relief within 120 minutes in acute psychosis 4

Medications to AVOID

• Midazolam: Elevated risk of serious adverse events without efficacy gains 1

  • Poses risks of severe side effects, especially in older adults 4
  • Despite providing rapid sedation, risk-benefit ratio unfavorable

• Benzodiazepines in TBI: Should be avoided for agitation/aggression in traumatic brain injury 6

• Haloperidol in TBI: Should be avoided 6

• Rivastigmine: Do NOT use—associated with more severe and longer delirium, trend toward higher mortality 3

Critical Safety Considerations

Serious Adverse Events Occur Frequently

16.8% of older adults administered antipsychotic or anxiolytic medications experienced serious adverse events 1, including:

• Respiratory depression (apnea, airway obstruction, oxygen desaturation <90%, intubation)
• Prolonged QTc (>500 ms)
• Arrhythmia
• Hypotension
• Dystonia
• In-hospital falls
• Delirium exacerbation
• Cardiac arrest
• Mortality

Route-Specific Risks

Intravenous and intramuscular routes increase risk of adverse events compared to oral administration 1

Dose-Response Relationships

• Lorazepam: Clear increased risk with escalating doses 1
• Droperidol and quetiapine: Clinically relevant signals for dose-response adverse events 1

Algorithmic Approach by Clinical Context

Emergency Department/Prehospital Setting

1. First attempt: Nonpharmacologic approaches (person-centered communication, sensory therapy) 1

2. If oral route possible:

   • Offer oral olanzapine or lorazepam 2
   • 70.8% acceptance rate when offered 2
   • Time to adequate sedation: 15 minutes (equivalent to IM) 2

3. If oral route refused/impossible:

   • Consider IM ziprasidone (better tolerated than haloperidol) 4
   • Or droperidol (faster sedation) 4
   • Or haloperidol + promethazine combination 4

4. Avoid midazolam in older adults 1

ICU Setting (Delirium-Related Agitation)

1. For delirium treatment:

   • Quetiapine 50 mg every 12 hours (can increase by 50 mg increments) 3
   • May add haloperidol 1-10 mg IV every 2 hours as needed 3

2. Prophylaxis: Insufficient evidence to recommend routine antipsychotic prophylaxis 3

Pediatric Populations

• Most commonly used: Diphenhydramine (26.4%), lorazepam (19%), olanzapine (18.1%) 5
• Extrapyramidal symptoms: Rare (0.24%) but manageable with diphenhydramine 5
• Acceptance rate: 11% required repeat dosing within 5-120 minutes 7

Common Pitfalls

1. Defaulting to IM/IV when oral would work: 70.8% of patients accept oral medications when offered 2

2. Using midazolam in older adults: No efficacy benefit, elevated adverse event risk 1

3. Ignoring QT prolongation risk: Screen for baseline QT prolongation, concurrent medications, and arrhythmia history before using antipsychotics 3

4. Dose escalation without considering cumulative risk: Particularly problematic with lorazepam 1

5. Using benzodiazepines or haloperidol in TBI patients: Associated with worse outcomes 6