Medicines for PTSD

Medicine can ease PTSD (post-traumatic stress disorder). A few antidepressants have good evidence. They can make memories less upsetting, calm the feeling of being on edge and help with sleep and mood.^1,5

Medicine is not the only path, and for most people it is not the first one. A major U.S. guideline puts trauma-focused talk therapy first.⁴ But medicine is a good choice when therapy is hard to reach, when you would rather not do it, or alongside therapy. This page explains what works, what does not, and what to ask your doctor.

Therapy, medicine or both?

The American Psychological Association updated its PTSD guideline in 2025. It strongly recommends trauma-focused therapies, such as cognitive processing therapy and prolonged exposure, as the first choice. It lists certain medicines as a second choice.⁴

The same guideline says there is not enough research comparing the two head to head to say one is better.⁴ So the choice is personal. Read about the therapies on our page Trauma-focused therapies.

Taking medicine for PTSD does not mean you have to talk in detail about the trauma. At the first visit, the prescriber may ask only what kind of event it was and when it happened.¹

The three medicines with the best evidence

These three medicines are all antidepressants. PTSD may change the brain chemicals that handle stress, and these medicines are thought to help bring them back into balance.¹ They appear to work about equally well.¹

Sources for the table: VA/DoD guideline and FDA labels.^2,6,7,8

SSRI stands for selective serotonin reuptake inhibitor. These medicines raise the level of serotonin, a brain chemical messenger. An SNRI (serotonin and norepinephrine reuptake inhibitor) raises serotonin and a second messenger, norepinephrine.

Venlafaxine is FDA-approved for depression and several anxiety disorders, but not for PTSD.⁸ Doctors can still prescribe it for PTSD. This is called "off-label" use.

The 2025 APA guideline also suggests fluoxetine (Prozac).⁴ The VA/DoD guideline found too little evidence to recommend for or against fluoxetine or other SSRIs, such as citalopram and escitalopram.²

To learn more about this group of medicines, see Antidepressant medicines.

How well do they work?

A Cochrane review updated in May 2026 pulled together 66 studies with about 7,400 adults.⁵ It found:

• About 58 in 100 people who took an SSRI improved, compared with about 35 in 100 who took a placebo.⁵
• Mirtazapine and amitriptyline, two other antidepressants, may help too. But each was tested in only one small study.⁵
• Antipsychotic medicines showed no clear benefit.⁵

What this means in daily life. Medicine helps many people, but not everyone. It usually makes symptoms less intense rather than making them disappear. Most studies lasted only a few weeks to about six months, so less is known about the long term.⁵ If the first medicine does not help enough, your doctor may change the dose or try another.

What to expect when you start

• Your doctor starts low and goes slow. The dose is raised step by step, based on how you feel.
• Give it time. You may notice changes within a few weeks. Many people feel better in about 4 to 6 weeks. Keep taking it even if you notice nothing at first.¹
• Regular check-ins. You meet with the prescriber about every few months to talk about benefits, side effects and the dose.¹
• Stopping later. Some people stop after they feel better and other parts of life have improved. Plan this with your prescriber.¹

Common side effects

Many side effects are mild and fade in the first weeks. Others last as long as you take the medicine.¹ Common ones include:^1,6

• Upset stomach, nausea or loose stools
• Sweating, headache or dizziness
• Shakiness (tremor) or less appetite
• Sexual side effects, such as lower desire or trouble reaching orgasm

Other things to know:

• Blood pressure. Venlafaxine can raise blood pressure. Your doctor should check it before you start and during treatment.⁸
• Bleeding. These medicines can raise the risk of bleeding, more so with aspirin, pain relievers like ibuprofen, or blood thinners such as warfarin.^6,8
• Serotonin syndrome. This rare but serious reaction is more likely when two medicines that raise serotonin are combined.⁶ Make sure every doctor and pharmacist knows all your medicines and supplements.
• Stopping suddenly. Stopping or cutting back fast can cause dizziness, nausea, poor sleep, irritability and odd skin sensations.^6,7 Coming off venlafaxine can take several months for some people.⁸ Talk with your doctor or pharmacist before changing anything.
• Pregnancy. Paroxetine in early pregnancy is linked to a small increase in heart defects in babies. If you are pregnant or planning to be, ask about other choices.⁷
• Suicidal thoughts in young people. All antidepressants carry an FDA boxed warning. In short studies, they raised the risk of suicidal thoughts and actions in children and adults under 25. This rise was not seen in adults 25 to 64. It was lower in adults 65 and older.⁶

Older adults: extra points to check

People in their 60s, 70s and beyond can take these medicines. In studies, older adults did about as well as younger adults.^6,7 A few things need more care:

• Slower processing. Older bodies clear sertraline from the blood more slowly, so doctors usually start at the low end.⁶
• Low sodium (salt) in the blood. SSRIs and SNRIs can lower sodium. The risk is higher in older adults and in people who take water pills (diuretics).^6,8 Signs include headache, trouble concentrating, confusion, weakness and unsteadiness, which can lead to falls.^6,7 Ask whether you need a blood test.
• Paroxetine. It can cause dry mouth, constipation, blurry vision and, less often, trouble passing urine.⁷ Ask your doctor whether another choice may suit you better.
• Bleeding. Many older adults take aspirin or blood thinners, which add to the bleeding risk.⁶

PTSD can show up or come back late in life. Read more on PTSD in older adults and veterans and Medicines that can affect mood and memory.

Prazosin for nightmares: mixed evidence

Prazosin (brand name Minipress) is an older blood pressure medicine. It is an alpha-blocker, which means it blocks one of the body's stress signals. It is FDA-approved only for high blood pressure.⁹ Doctors sometimes prescribe it off-label for PTSD nightmares.

What the research shows. Early small studies in veterans suggested prazosin cut nightmares. Then a larger VA study tested it in 304 veterans at 13 VA medical centers for 26 weeks. Prazosin did no better than a placebo for distressing dreams or sleep quality.¹⁰

What the guidelines say. The 2023 VA/DoD guideline suggests prazosin for PTSD nightmares. It suggests against it for PTSD symptoms as a whole.^2,3 The 2025 APA guideline found too little evidence to recommend it either way.⁴ Limited research

Side effects to know. Prazosin can make you dizzy or lightheaded, especially when you stand up. Some people faint, most often after the first dose.⁹ This matters for older adults, who are more likely to fall.

• Avoid driving for 24 hours after the first dose and after any dose increase.⁹
• Get up slowly. Alcohol, standing for a long time, exercise and hot weather can make dizziness worse.⁹
• If you plan cataract surgery, tell your eye surgeon you take or have taken prazosin. It can affect the iris during surgery.⁹
• An erection lasting more than 4 hours is an emergency. Get medical help right away.⁹

For other ways to sleep better, see Sleep, mood and anxiety and Sleep medicines: what to know.

Medicines that are not recommended

Benzodiazepines

Benzodiazepines are calming medicines such as alprazolam (Xanax), lorazepam (Ativan), clonazepam (Klonopin) and diazepam (Valium). They can ease anxiety for a short time. But the VA/DoD guideline strongly recommends against them for PTSD.¹¹ The APA guideline also advises against them and urges extra caution in older adults.⁴

Why they are avoided:^11,12

• There is little proof they help PTSD.
• They can lead to misuse, addiction and dependence.
• Long-term use is linked to memory problems and a higher risk of dementia.
• In older adults, they make falls 2 to 3 times more likely. The risk of hip fracture is about 50% higher. Car crashes are more likely too.
• Taken with opioid pain medicines or alcohol, they can slow breathing and cause a deadly overdose.

The VA has worked to cut their use. Among veterans with PTSD, prescriptions fell from about 30% in 2012 to 7% in 2022.¹¹

Other medicines

• Cannabis (marijuana) and products made from it: the VA/DoD guideline recommends against them for PTSD.² The APA guideline says they cannot be recommended at present.⁴
• Antipsychotics added on to an antidepressant, such as quetiapine or risperidone: the VA/DoD guideline suggests against this.²
• Ketamine: the VA/DoD guideline suggests against it for PTSD. The APA found too little evidence to decide.^2,4 See Ketamine and esketamine.
• Many other medicines have too little research to say whether they help PTSD. Examples include mirtazapine, bupropion and duloxetine.²

What the two main U.S. guidelines say

Sources for the table: VA/DoD guideline tables and APA guideline.^2,4

MDMA-assisted therapy: where it stands

MDMA is the drug also known as ecstasy or molly. In MDMA-assisted therapy, a person takes MDMA under close supervision, along with talk therapy from trained therapists. Researchers have studied it for PTSD in clinical trials.¹⁵

The 2024 FDA decision. A company then called Lykos Therapeutics asked the FDA to approve MDMA capsules for PTSD. In June 2024, an FDA panel of outside experts reviewed the data. Nine of 11 members voted that the data did not show it works. Ten of 11 voted that the benefits did not outweigh the risks.¹³ In August 2024, the FDA did not approve it. It sent a letter asking for more research on how long the benefits last, on safety, and on ways to reduce bias in the studies.¹⁴

What has happened since. In August 2026, the company, now called Resilient Pharmaceuticals, was reported to have sent the FDA a new application. It did not include a new large study.¹⁴ The FDA will review it again. As of October 2026, MDMA is not FDA-approved for any condition.¹⁵

If you are interested in this research, ask about supervised clinical trials. Read more on Psilocybin and psychedelic research.

Questions to ask your doctor

When to get help

• Call or text 988 if you have thoughts of suicide or feel unable to cope. You can also chat at 988lifeline.org.
• Call 911 if someone is in immediate danger, has trouble breathing, or has a seizure.
• Call your doctor soon if your mood gets worse after starting or changing a medicine, if side effects are hard to live with, or if you feel faint or fall.
• Veterans can get PTSD care, including medicine, at any VA medical center.¹ To reach the Veterans Crisis Line, dial 988 and press 1, or text 838255.¹⁶

For more ways to cope day to day, see Coping with trauma symptoms. For the full picture, return to PTSD and trauma.

Education only. This page is general information written from the sources listed. It is not medical, legal or financial advice and does not replace a doctor, therapist or lawyer who knows your situation. How we write and check pages.