What medication can be used as needed for akathisia?

PRN Medication for Akathisia

For acute akathisia management on an as-needed basis, use propranolol 10-30 mg two to three times daily or lorazepam 0.5-1 mg as needed, with propranolol being the first-line choice based on the strongest evidence. 1

First-Line PRN Options

Beta-blockers are the most consistently effective treatment for acute akathisia, with propranolol being the best-studied agent 2, 3, 4. The lipophilic beta-blockers (propranolol and pindolol) have demonstrated superior efficacy compared to other medication classes in network meta-analysis 2.

• Propranolol: 10-30 mg two to three times daily 1
• Start at the lower end (10 mg) and titrate based on response
• Contraindications include severe asthma, heart block, and bradycardia

Benzodiazepines rank as highly effective alternatives 2:

• Lorazepam: 0.5-1 mg as needed 5
• Particularly useful when subjective distress is prominent
• Use cautiously in elderly patients and those with cognitive impairment 6

Alternative PRN Agents

If beta-blockers and benzodiazepines are contraindicated or ineffective:

Anticholinergics 5:

• Benztropine or biperiden can be used
• More effective for acute dystonia but may help akathisia
• Avoid in elderly patients due to cognitive side effects 7

Mirtazapine 8:

• 7.5-15 mg at bedtime
• Evidence supports its use, though typically given as scheduled rather than PRN
• Ranked highly in comparative efficacy studies 2

Clinical Algorithm

1. First attempt: Reduce or discontinue the offending antipsychotic if clinically feasible 3

2. If medication change not possible, initiate PRN treatment:

   • First choice: Propranolol 10 mg PRN (up to 30 mg, 2-3 times daily)
   • Second choice: Lorazepam 0.5-1 mg PRN if beta-blockers contraindicated

3. If monotherapy fails: Consider combining propranolol with a benzodiazepine 4

4. Refractory cases: Add anticholinergic or consider switching to quetiapine or olanzapine 1

Important Caveats

• Assess systematically using the Barnes Akathisia Rating Scale (BARS) before and during treatment 3
• Benzodiazepines should NOT be used as initial treatment if the patient is not already taking them and delirium is suspected 6
• Paradoxical agitation can occur with benzodiazepines in approximately 10% of patients 7
• Duration of adjuvant therapy is not well-established; use cautiously and reassess regularly 3
• Recent evidence suggests acetaminophen may have a role in tardive akathisia, though this requires further validation 9

The evidence strongly favors propranolol as first-line PRN therapy, with benzodiazepines as the most appropriate alternative when beta-blockers cannot be used 2, 3, 8, 4.