NCNE | Adult Psychiatric Medication Management & Telehealth

  1. Home
  2. Trauma & PTSD
  3. Prazosin for nightmares

Trauma & PTSD

Prazosin for nightmares

Trauma-related nightmares are among the most exhausting symptoms of PTSD and among the hardest to treat, because most sleep and psychiatric medications do little for them. Prazosin is the exception people search for: an old blood-pressure medication that, taken at bedtime, can reduce the frequency and intensity of trauma nightmares for some people. It is not a cure, the evidence is genuinely mixed, and it has one precaution that matters. This page sets out what it does, what the research actually shows, and how it is started safely.

A calm, private space set up for a telehealth psychiatric appointment

Who this is for: Adults 18–65 in Connecticut, Massachusetts, New Hampshire, Maine, Rhode Island, Virginia, and Kentucky living with trauma-related nightmares or PTSD-related sleep disruption, or who have been prescribed prazosin and want to understand it.

How prazosin works

Prazosin blocks alpha-1 receptors, one of the places adrenaline and noradrenaline act. Its FDA approval is for high blood pressure. In PTSD, the theory is that an over-active noradrenaline system during sleep drives the vivid, physiological nightmares of trauma — the waking with a pounding heart, drenched in sweat — and that damping that system at night lets sleep run without the alarm going off. Its use for nightmares is off-label and has been part of PTSD care, particularly in veterans, for a long time.

What the evidence actually says

Honestly: mixed. A series of smaller trials, mostly in veterans, found that prazosin reduced trauma nightmares and improved sleep compared with placebo, and that experience is what put it into guidelines. The largest and most rigorous trial — a multi-site study in military veterans published in the New England Journal of Medicine — found no benefit over placebo on nightmares, sleep quality or overall PTSD symptoms. There are reasonable explanations for the difference, including who was enrolled, but the plain reading is that prazosin helps some people and not others, and that nobody can yet say in advance which.

In practice that means a trial of prazosin is a reasonable thing to try when nightmares are the dominant problem, that it is judged on results over a few weeks rather than assumed to work, and that it is stopped if it does nothing.

What to expect if you take it

  • Taken at bedtime; it’s increased gradually over days to weeks, because the body needs to adjust to its blood-pressure effect
  • The first-dose precaution: prazosin can cause a sharp drop in blood pressure on standing, especially after the first dose or a dose increase — dizziness, faintness, occasionally fainting. The first dose is taken lying down at bedtime, and getting up in the night is done slowly
  • Dizziness, tiredness, headache and a stuffy nose are the common ongoing effects; most fade
  • It isn’t sedating in the way a sleeping tablet is — it’s meant to let sleep proceed undisturbed, not to force it
  • It isn’t habit-forming and has no discontinuation syndrome, though a daily dose is reduced rather than stopped abruptly because of blood pressure
  • Effect, where there’s one, usually appears within a few weeks; if there’s none by then, it’s reconsidered

Where it fits

Prazosin treats a symptom, not the trauma. At NCNE it’s one part of a plan that also looks at the rest of sleep, at hyperarousal and mood during the day, at alcohol — which is very often part of the nightmare picture and makes them worse — and at trauma-focused therapy, which is the treatment with the strongest evidence for PTSD itself. Where a therapist is already involved, we coordinate with them, with your permission.

Common questions

Does prazosin work for nightmares?
For some people, clearly; for others, not at all, and the largest trial to date found no difference from placebo overall. The honest approach is a supervised trial over a few weeks with a clear way to judge whether nightmares and sleep have actually improved, and a decision to stop if they have not.
How long does prazosin take to work for nightmares?
Where it works, people usually notice within a few weeks of reaching a steady dose — often as fewer nightmares and less waking, before the content of the dreams changes. The gradual increase at the start means the first week or two may show little; that’s expected.
Is prazosin addictive?
No. It doesn’t act on the brain's reward system and has no withdrawal syndrome. Daily use is reduced gradually rather than stopped abruptly because of its effect on blood pressure, but that’s a cardiovascular precaution, not dependence.
Why do I have to be careful with the first dose?
Because prazosin lowers blood pressure and the first dose can do so sharply on standing, causing dizziness or fainting. That’s why it’s started low, at bedtime, lying down, and increased in steps — and why getting up in the night is done slowly at the start. The effect settles as the body adjusts.
Can I take prazosin with an antidepressant?
Usually, yes — it’s commonly combined with an SSRI or SNRI in PTSD care. Combinations with other blood-pressure medications, or with anything else that lowers blood pressure, need care and are checked against your full medication list.
Do I have to be a veteran, or have a PTSD diagnosis?
No. Most of the research was done in veterans, but trauma-related nightmares are the same symptom whatever their source. What matters is a proper evaluation of what is driving the nightmares — trauma, alcohol, another sleep disorder, a medication — before prazosin or anything else is tried.
How do I find out whether this is right for me?
At an evaluation. NCNE's first visit is a 60-minute video appointment that covers your symptoms, history, past treatments and what you’re hoping will change; prazosin is one of the options weighed there, against the alternatives and against not medicating at all. You leave with a plan you helped write, and nothing is started until you understand what it does and doesn’t do.

Sources

  • U.S. Food and Drug Administration. Prescribing information for prazosin (Minipress) — indications, warnings and adverse reactions. DailyMed
  • Raskind MA, et al. Trial of Prazosin for Post-Traumatic Stress Disorder in Military Veterans. N Engl J Med. 2018. PubMed

This page is general information, not a prescription or a recommendation for you. Whether any medication is right for you, and how it would be started, adjusted or stopped, is decided at an evaluation with a prescriber who knows your history. Do not start, change or stop a medication on the strength of a webpage.

Related: Trauma & PTSD at NCNE · Trazodone for sleep · Alcohol use & recovery

If you are in immediate danger, call 911. For urgent emotional support at any hour, call or text 988(Suicide & Crisis Lifeline). Telehealth visits and this website are not an emergency service.

Nightmares wrecking your sleep? Book a telehealth evaluation with Laura Gabriel, PMHNP-BC, or send a message and we will respond within two business days.

Book an Appointment