Prazosin's Effects on Sleep and Alertness

Understanding Prazosin's Paradoxical Effects

Patients treated with prazosin for PTSD-related nightmares report feeling more rested on awakening and experience less daytime fatigue and sleepiness after successful nightmare treatment, according to the American Academy of Sleep Medicine 1
Prazosin reduces CNS adrenergic activity, which decreases nightmare frequency and intensity rather than acting as a traditional sedative, as reported by the American Academy of Sleep Medicine 1, 2

Prazosin is typically administered at bedtime, starting at 1 mg and gradually increasing by 1-2 mg every few days until reaching an effective dose, which helps minimize daytime drowsiness, as recommended by the American Academy of Sleep Medicine 1, 2

Blood pressure should be monitored after the initial dose and with each significant dose increase to distinguish hypotension-related symptoms from true sedation, as suggested by the American Academy of Sleep Medicine and other guideline societies 3
Clinicians should specifically assess for orthostatic hypotension, especially after the first dose, as this can cause symptoms that overlap with drowsiness, according to the American Academy of Sleep Medicine 1, 5