What EMDR actually does, in plain terms

Eye Movement Desensitization and Reprocessing, or EMDR, was developed by Francine Shapiro in the late 1980s and has since become one of the most studied psychotherapies for post-traumatic stress disorder. Shapiro’s third-edition foundational text, Eye Movement Desensitization and Reprocessing (EMDR) Therapy: Basic Principles, Protocols, and Procedures (Guilford Press, 2017), lays out the eight-phase protocol and the Adaptive Information Processing model that underlies the method. The World Health Organization, the American Psychological Association, and the U.S. Department of Veterans Affairs all list EMDR as a recommended treatment for PTSD.

The simplified version is this. A trained therapist guides the patient to recall a specific traumatic memory while simultaneously engaging in bilateral stimulation—most commonly side-to-side eye movements following the therapist’s finger, but also alternating taps or tones. The theory is that this dual attention task allows the brain to reprocess a memory that has been stuck in maladaptive storage, integrating it into ordinary autobiographical memory rather than continuing to fire as if the threat were happening now.

EMDR is not exposure therapy in the traditional sense, and it is not talk therapy. Patients do not have to verbalize the trauma in detail. The mechanism is debated—working memory taxation, REM-like processing, attentional shifting—but the clinical results are real. For many patients with single-incident trauma, a course of EMDR meaningfully reduces PTSD symptoms. For complex or developmental trauma, the picture is more nuanced, which is part of why interest in combining EMDR with other modalities has grown.

What ketamine actually does for PTSD

Ketamine is FDA-approved as an anesthetic; its use for PTSD is off-label. The interest in ketamine for trauma began in earnest with a 2014 randomized controlled trial by Adriana Feder and colleagues, published in JAMA Psychiatry, which compared a single IV ketamine infusion to active midazolam control in 41 PTSD patients. The ketamine group showed significant reductions in PTSD symptoms 24 hours after infusion. It was a first signal that an NMDA-targeting drug could shift PTSD presentations rapidly.

The follow-up that mattered most was published in 2021. Feder and colleagues ran a randomized trial in the American Journal of Psychiatry comparing six IV ketamine infusions over two weeks against six midazolam infusions in 30 patients with chronic PTSD. The ketamine group showed a significantly greater reduction in Clinician-Administered PTSD Scale (CAPS-5) scores at the two-week endpoint. That study moved ketamine for PTSD from interesting case data into a small but real evidence base for repeated-dose treatment.

Ketamine is not a stand-alone trauma therapy. It does not, on its own, walk the brain through reprocessing a specific memory. What it appears to do is reduce the autonomic and affective reactivity that keeps trauma symptoms entrenched, while opening a period of enhanced neural flexibility. That is where the conversation about combining it with structured therapy becomes interesting. We have written more about how clinicians think about ketamine for PTSD and ketamine for complex PTSD if you want a deeper read.

The neuroplastic window: Krystal, Liston, and the case for combining

The mechanistic case for pairing ketamine with EMDR rests on what researchers call the post-ketamine neuroplastic window. John Krystal at Yale and Conor Liston at Weill Cornell have been central to characterizing it. Krystal and colleagues, writing in Neuron and related review literature in 2019, described how ketamine produces a rapid, glutamate-driven surge of AMPA-receptor signaling, leading to BDNF release and the formation of new dendritic spines. Liston’s lab demonstrated, in mouse models published in Science (2019), that ketamine produces measurable increases in synaptic spine density within 24 hours that correlate with the duration of antidepressant-like behavioral effects.

The clinical translation is that for several days after a ketamine infusion, the brain may be in a more plastic state—more capable of forming new associations and weakening old maladaptive ones. We covered the underlying biology in detail in our primer on the neuroplastic window and the mechanism breakdown in ketamine and the neuroplastic window.

If that window is real and clinically meaningful in humans—and the evidence supports the underlying biology, even if the optimal way to exploit it is unsettled—then a structured trauma protocol applied during that window has a coherent rationale. EMDR’s bilateral-stimulation reprocessing is precisely the kind of structured, memory-targeted intervention that depends on the brain’s ability to update old material. Combine the two, and the theory is you get the reactivity-reducing and plasticity-opening effects of ketamine plus the targeted reprocessing of EMDR.

It is worth being honest that this rationale is currently stronger than the controlled-trial data supporting it. Most of what we have for the combination specifically is case series, clinician reports, and small open-label studies. Randomized trials of ketamine plus EMDR versus EMDR alone or ketamine alone are limited.

How integration sessions are typically scheduled

There is no consensus protocol for ketamine plus EMDR. What follows is what we see in clinical practice with the EMDR therapists who refer to us and whom we refer patients to.

The infusion itself is not the EMDR session. During the infusion, patients are typically lying comfortably with eyes closed, often with eye shades and curated music. Trying to run a structured eight-phase EMDR protocol during a dissociative state is not how the integration is generally done. The infusion is a quiet, internally directed experience. The reprocessing comes later.

EMDR sessions are usually scheduled in the days following an infusion, most commonly between 24 and 72 hours after. Some therapists prefer the morning after; others wait two or three days. The optimal timing has not been established in controlled trials, and reasonable clinicians choose differently. What they tend to share is the intuition that the window is open for several days, narrows over the course of a week or two, and is best used while it is fresh.

A common cadence looks like this: a ketamine series of four to six infusions over two to three weeks, with EMDR sessions interleaved between infusions and continuing afterward. Some patients do EMDR before starting ketamine to stabilize and prepare; some begin EMDR only after the infusion series; many combine both. The specifics depend on the therapist’s training, the patient’s history, and what is presenting in session. Our overview of ketamine-assisted psychotherapy walks through how integration generally works.

When not to combine them

Combination is not always the right move. There are situations where adding a structured trauma protocol on top of ketamine creates more risk than benefit.

Talk to your prescribing clinician and your therapist about whether combining is appropriate for you. Neither of us can answer that from a blog post.

Finding an EMDR-trained therapist in TN who'll work with ketamine

EMDR International Association certification is the most common credential. Not every certified EMDR therapist is comfortable working alongside ketamine—some have not been exposed to it, and some have philosophical objections. If you are looking for a therapist who already understands the integration model, our guide to finding an integration therapist in Tennessee covers what to look for and how to ask.

At Music City Ketamine, we maintain working relationships with therapists across Middle Tennessee who are comfortable coordinating with us. With your written consent, we can share clinical notes, discuss timing of sessions, and coordinate around your overall plan. We do not run EMDR ourselves; that is your therapist’s domain. Our role is the medical side of the infusion, the monitoring, and the handoff back to your therapy.

If you are a veteran or first responder, our pages on ketamine for veterans and trauma-focused care explain how we approach those clinical pictures. Many veterans dealing with PTSD have already done a course of EMDR or are considering it; the population is one where the combination question comes up regularly.

Realistic expectations and the limits of the data

Here is the honest version. EMDR is well-established for PTSD. Ketamine has a growing but still small evidence base for chronic PTSD, anchored by Feder 2014 and Feder 2021. The combination of the two is supported by a coherent mechanistic rationale and by clinician experience, but not yet by large randomized trials specifically testing the pairing. Research suggests the combination may be valuable; the published data does not yet prove a defined protocol works better than either alone.

What that means practically: do not expect a predictable outcome from combining them. Some patients respond beautifully. Some respond to ketamine alone and do not need the EMDR component. Some find EMDR’s reprocessing unlocks ground that ketamine alone could not reach. The pattern is individual.

A note on cost. Insurance does not generally cover IV ketamine for off-label psychiatric uses, and our infusions are $475 per session. EMDR therapy is typically billed separately by your therapist, and many EMDR clinicians do accept insurance for the psychotherapy portion. We are transparent about pricing because we would rather have that conversation up front than after.

If you want to explore what this might look like for your situation, the path forward is a consultation. We will review your trauma history, your current treatment, what you have tried, what your therapist thinks, and whether ketamine is a sensible addition. Our broader PTSD care overview provides context for how we think about trauma-focused work as a whole.