Quick Answer
PTSD medication side effects vary by drug. SSRIs and SNRIs commonly cause early nausea, headache, sleep changes and jitteriness, and sometimes sexual side effects. Prazosin can cause dizziness on standing. Many side effects fade or can be managed with timing, dose changes or switching, so they're worth discussing rather than quitting.
Understanding PTSD Medication Side Effects
Medication can help many people with PTSD, but side effects are a common reason treatment stops early. Knowing what’s likely helps. SSRIs, such as sertraline and paroxetine, and SNRIs, such as venlafaxine, are the medications most often used for PTSD. Their early side effects commonly include nausea, loose stools, headache, sleep changes, sweating and a jittery or restless feeling. For people with PTSD, jitteriness can feel like heightened arousal, which is one reason doses usually start low. Many of these effects fade within the first few weeks as the body adjusts. This guide is part of our New York PTSD guide.
A review in the American Psychiatric Association’s FOCUS journal noted that discontinuing SSRI treatment for PTSD has been associated with relapse and a return of symptoms. That’s a strong reason to address side effects rather than simply stopping. Most side effects have workable solutions, such as adjusting the time of day, slowing increases, lowering the dose, adding a short-term remedy or switching to another medication. The key is telling your prescriber what you’re experiencing. Our guide on sertraline titration for PTSD explains how doses are adjusted.
For New Yorkers balancing demanding jobs and family life, side effects can decide whether PTSD medication is sustainable. Nationally, NIMH estimates that 3.6% of U.S. adults had PTSD in the past year, with higher rates among women (5.2%) than men (1.8%). Secure video visits from anywhere in New York can make it easier to start trauma care from a place that feels safe.
Common SSRI and SNRI side effects, sexual and sleep side effects, and managing side effects without stopping are the three topics this guide covers.
Prazosin and other medications
Prazosin, sometimes used for PTSD nightmares, lowers blood pressure and can cause dizziness or lightheadedness, especially when standing up quickly or after the first doses. Rising slowly and increasing the dose gradually help. Other medications sometimes added for PTSD, such as certain antipsychotics or sleep medications, have their own side effects, including weight gain, drowsiness or next-day grogginess. Benzodiazepines can affect memory and coordination and carry dependence risk, so they’re generally avoided as a long-term PTSD treatment.
Discontinuation symptoms
Stopping an SSRI or SNRI suddenly can cause discontinuation symptoms, such as dizziness, irritability, flu-like feelings, trouble sleeping and electric-shock sensations. They’re not dangerous for most people, but they’re unpleasant and can be mistaken for PTSD returning. Tapering slowly under your prescriber’s guidance reduces them. If you miss a few doses and feel unwell, contact your prescriber. Planning any change together is the wisest approach.
Key Takeaways
- Many early side effects ease within a few weeks.
- Sexual side effects are common with SSRIs and worth raising.
- Prazosin can cause lightheadedness when standing up.
- Stopping suddenly can cause discontinuation symptoms.
PTSD Medication Side Effects at a glance
| Side effect | Possible approach |
|---|---|
| Nausea | Take with food; often fades |
| Sleep changes | Adjust timing of dose |
| Jitteriness | Slower titration or lower dose |
| Sexual side effects | Discuss dose, timing or switching |
| Dizziness on standing | Rise slowly; review dose |
Sexual side effects
Sexual side effects, such as lower desire, trouble with arousal or delayed orgasm, are common with SSRIs and SNRIs. They can be hard to bring up, but they matter, especially because PTSD itself can already affect intimacy. They sometimes persist rather than fading. Options include adjusting the dose, changing timing, switching to a medication with a different side effect profile, or other strategies your prescriber can discuss. You don’t have to accept them silently. Mentioning them is routine and helps your prescriber find a better fit.
Sleep side effects
Some SSRIs can make sleep lighter or cause vivid dreams, while others cause daytime drowsiness. For people with PTSD, who often already have nightmares and insomnia, this deserves attention. Taking an activating medication in the morning or a sedating one at night can help. Sleep may also improve as PTSD itself improves. If nightmares or insomnia remain a major problem, your prescriber may add a targeted treatment or recommend cognitive behavioral therapy for insomnia. Keeping a sleep log shows what’s changing. Our guides on sertraline titration for PTSD and prazosin titration for nightmares cover related topics.
Side effect care for New York patients
Side effect check-ins happen by secure video, and dose changes can be sent to your pharmacy electronically. Visits run by secure video anywhere in New York, while you’re physically in the state. The practice is in-network with Aetna and Cigna; confirm your New York plan with the office, and see self-pay fees on the Good Faith Estimate page.
Keeping track
Writing down side effects, when they started and how intense they are helps your prescriber decide what to change. Note whether they’re improving, staying the same or getting worse. Mention any other medications, supplements or alcohol use, since these can add to side effects. Be honest about how much a side effect bothers you. A mild effect you can live with is different from one that makes you want to stop, and your prescriber needs to know which it is.
When to call right away
Contact your prescriber promptly for side effects that are severe or getting worse, signs of an allergic reaction, fainting, confusion, or a sudden spike in agitation or restlessness. New or worsening thoughts of suicide, especially after starting or changing a medication, need immediate help through 988 or 911. For milder side effects, a message or scheduled visit is fine. It’s always better to ask than to stop on your own.
The Bottom Line
PTSD Medication Side Effects is common and treatable, and careful care can make daily life feel more manageable.
Frequently Asked Questions
What are common side effects of PTSD medications?
SSRIs and SNRIs commonly cause early nausea, loose stools, headache, sleep changes, sweating and jitteriness. Many fade within a few weeks. Sexual side effects are also common and may persist. Prazosin can cause dizziness when standing. Tell your prescriber what you notice so it can be managed.
Should I stop my PTSD medication if I have side effects?
Don't stop suddenly, since that can cause discontinuation symptoms and raise the chance of relapse. Most side effects can be managed by changing timing, slowing the dose increase, lowering the dose or switching. A review noted stopping SSRIs for PTSD has been linked with relapse. Talk with your prescriber first. There are usually workable options.
Can PTSD medication cause sexual side effects?
Yes, sexual side effects like lower desire or delayed orgasm are common with SSRIs and SNRIs. They sometimes persist rather than fading. Options include adjusting the dose or timing, or switching medications. Mentioning them is routine and helps your prescriber find a better fit. You don't have to accept them silently.
Why does prazosin make me dizzy?
Prazosin lowers blood pressure, which can cause dizziness or lightheadedness, especially when standing up quickly. This is more common after the first doses or after an increase. Rising slowly and increasing the dose gradually help. Tell your prescriber if dizziness is frequent or you feel faint. Fainting needs prompt medical attention.
What happens if I stop my PTSD antidepressant too quickly?
Stopping an SSRI suddenly can cause dizziness, irritability, flu-like feelings, trouble sleeping and electric-shock sensations. These symptoms are unpleasant but usually not dangerous. They can be mistaken for PTSD returning. Tapering slowly under guidance reduces them. Contact your prescriber if you miss doses and feel unwell.
Can side effects be managed by video in New York?
Yes, side effect check-ins and dose adjustments happen by secure video anywhere in New York. You need to be physically in New York during each visit. New prescriptions go electronically to your pharmacy. The practice is in-network with Aetna and Cigna; confirm your New York plan with the office. Messages between visits are welcome for questions.
Where to go from here
- Right now, if you're not safe
- Call or text 988, or call 911.
- If you'd like an evaluation
- See how scheduling and telehealth work on the new patient page.
- If you want to keep reading
- Return to our guide to PTSD care in New York for more guides. For more help preparing and finding care, see NIMH’s tips for talking with your health care provider and FindTreatment.gov.
How We Reviewed This Page
Written by Steven Lockhart of Health Marketing Group and clinically reviewed by Gabriella I. Farkas, MD PhD, a board-certified psychiatrist. Clinical information comes from the sources listed below, and the page is reviewed every 180 days or when guidance changes.
What’s new: September 29, 2026. Page published.
References
- Friedman MJ. PTSD: Pharmacotherapeutic Approaches. FOCUS (American Psychiatric Association). https://focus.psychiatryonline.org/doi/10.1176/appi.focus.11.3.315
- ClinicalTrials.gov. Prazosin and Combat Trauma PTSD (PACT), NCT00532493; Raskind et al., NEJM 2018. https://clinicaltrials.gov/study/NCT00532493
- National Institute of Mental Health. Post-Traumatic Stress Disorder (PTSD) statistics. https://www.nimh.nih.gov/health/statistics/post-traumatic-stress-disorder-ptsd
- 988 Suicide & Crisis Lifeline. https://988lifeline.org/
- Tips for talking with your health care provider. https://www.nimh.nih.gov/health/publications/tips-for-talking-with-your-health-care-provider
- FindTreatment.gov. https://findtreatment.gov/