Equivalent Dose of Buspirone to Lorazepam 1mg

Mechanism Differences

Lorazepam is a benzodiazepine that works by enhancing the effect of GABA, producing sedation, muscle relaxation, and anxiolytic effects, as noted by the American College of Emergency Physicians 1, 2

Lorazepam has a rapid onset of action, with peak effect at 3-5 minutes when given IV, according to the American Academy of Pediatrics 3
Buspirone has a delayed onset of action, typically taking 2-4 weeks to achieve full therapeutic effect, as recommended by the American Academy of Family Physicians 4
Lorazepam has a duration of action of 4-8 hours, as reported by the American Academy of Pediatrics 3

The typical starting dose of buspirone is 5mg twice daily, with a maximum recommended dose of 20mg three times daily, as suggested by the American Academy of Family Physicians 4
Lorazepam is typically dosed at 0.5-2mg for anxiety, with effects noticeable within minutes, according to the American College of Emergency Physicians 1

Lorazepam is effective for acute anxiety and agitation, with rapid onset, as noted by the American College of Emergency Physicians 1, 2
Buspirone is useful only in patients with mild to moderate agitation and may take 2-4 weeks to become effective, as recommended by the American Academy of Family Physicians 4

Buspirone is not appropriate for acute anxiety or agitation where immediate relief is needed, as stated by the American Academy of Family Physicians 4
Lorazepam can cause tolerance, addiction, depression, and cognitive impairment with regular use, as warned by the American Academy of Family Physicians 4
Paradoxical agitation occurs in about 10% of patients treated with benzodiazepines like lorazepam, according to the American Academy of Family Physicians 4

For acute anxiety requiring immediate relief, lorazepam 1mg would be appropriate, as suggested by the American College of Emergency Physicians 1
For chronic anxiety management without sedation or dependence concerns, buspirone starting at 5mg twice daily would be more appropriate, as recommended by the American Academy of Family Physicians 4