Prazosin: The Alpha-1 Blocker for Hypertension and PTSD
What is Prazosin?
Prazosin is an alpha-1 adrenergic blocker used primarily to treat hypertension and symptoms of post-traumatic stress disorder (PTSD), such as nightmares and sleep disturbances. It works by relaxing the blood vessels and reducing the amount of work the heart has to do.
How Prazosin Works
Prazosin blocks the alpha-1 receptors in the blood vessels, causing them to relax and dilate, which reduces blood pressure. In PTSD, it works by affecting certain receptors in the brain, helping alleviate anxiety and improve sleep.
When to Use Prazosin
● Hypertension: Prazosin is used to treat high blood pressure and is often part of a combination therapy for better control.
● PTSD: It is used to treat nightmares and other symptoms of PTSD, particularly in veterans and trauma survivors.
● Scorpion envenomation: It is used to control the sympathetic symptoms in scorpion bite.
Dosage
● Adult Dose for Hypertension: Typically, 1 mg at bedtime, gradually increased to 5 mg twice daily. Maximum dose is 20 mg/day.
● Adult Dose for PTSD: Typically, 1 mg at bedtime, with gradual increases to 5-10 mg per day as needed.
● Pediatric dosage: Initial dosage is 0.05-0.1 mg/kg/day in divided doses every 8 hours.
● Scorpion envenomation: 0.25 mg every 3 hours until the extremities are warm and dry
Side Effects
● Common Effects: Dizziness, drowsiness, fatigue, and headache.
● Serious Adverse Effects: Orthostatic hypotension (low blood pressure upon standing), syncope, and fluid retention.
Common brands: Minipress XL, PrazopressXL.