What Internal Family Systems is

Internal Family Systems, usually shortened to IFS, is a psychotherapy model developed by the family therapist Richard Schwartz in the 1980s. Schwartz noticed that clients often described their inner lives as a set of competing voices—“part of me wants to leave, part of me is terrified to”—and he began applying ideas from family systems therapy to that inner landscape.

In the IFS model, the mind is made up of parts, each with its own feelings, beliefs, and job. Some parts are protectors. “Managers” try to keep life under control through planning, perfectionism, or criticism. “Firefighters” react when pain breaks through, sometimes with numbing, bingeing, or dissociation. Other parts, called exiles, carry the hurt, shame, or fear from earlier experiences, and the protectors work hard to keep them out of awareness. Underneath all of this, IFS describes a Self: a calm, curious, compassionate core that can relate to the parts rather than be taken over by them.

The therapy does not try to get rid of any part. As the title of Schwartz’s 2021 book, No Bad Parts, suggests, the goal is to understand what each part is protecting and help it trust the Self enough to relax. Many trauma survivors find that framing gentler than approaches that feel like a fight with their own mind, which is one reason IFS has become popular among trauma therapists.

Why some therapists pair IFS with ketamine

Therapists who combine IFS with ketamine-assisted work usually describe a few reasons. These are clinical rationales, not established findings, and it is worth reading them that way.

Several private training programs now teach IFS specifically for ketamine- and psychedelic-assisted settings. That tells us the pairing is popular. It does not tell us it works better than other approaches.

What the IFS research shows so far

IFS is widely practiced, but its research base is small compared with therapies like CBT or EMDR. A 2025 scoping review by Buys in Clinical Psychologist identified 27 published studies of IFS. Seventeen were case studies, five were quasi-experimental, three were qualitative, and two were randomized controlled trials. The review called IFS a promising treatment, particularly for chronic pain, depression, and PTSD, and called for larger, more rigorous trials.

The most frequently cited trial is Shadick and colleagues, 2013, in The Journal of Rheumatology. Researchers randomized 79 adults with rheumatoid arthritis to a nine-month IFS-based program or a mailed-education control. The IFS group improved in pain and physical function after treatment, and at one-year follow-up showed sustained gains in joint pain, self-compassion, and depressive symptoms. Disease activity itself did not change significantly.

For trauma, Hodgdon and colleagues published a pilot study in the Journal of Aggression, Maltreatment & Trauma (2022). Seventeen adults with PTSD and histories of multiple childhood traumas received 16 weeks of IFS therapy, and the authors reported that 92% no longer met diagnostic criteria for PTSD at follow-up. That is striking, but the study had no control group, so it cannot separate the effect of IFS from time, attention, or other factors.

A more recent randomized trial adds useful nuance. Joss and colleagues, publishing in Psychological Trauma: Theory, Research, Practice, and Policy in 2026, randomized 60 adults with PTSD to a 16-week online group IFS program or an active nature-based stress-reduction program. Both groups showed large reductions in PTSD symptoms, with no meaningful difference between them, though participants rated the IFS program more highly and attended more sessions. In short, the IFS evidence is encouraging but early.

What the ketamine-plus-therapy research shows

Ketamine is FDA-approved as an anesthetic; its use for depression, PTSD, and other psychiatric conditions is off-label. The best-studied psychiatric use is for depression, and there is a small but real randomized evidence base in chronic PTSD. A 2021 trial by Feder and colleagues in the American Journal of Psychiatry found that six ketamine infusions over two weeks lowered CAPS-5 PTSD scores by 11.88 points more than midazolam in 30 patients.

Research on adding therapy to ketamine exists, but it has used other therapies. In a 2021 randomized trial in Psychotherapy and Psychosomatics, Wilkinson and colleagues gave 28 people who had responded to ketamine for treatment-resistant depression either 14 weeks of cognitive behavioral therapy or usual care. The difference on the primary depression measure was moderate in size but not statistically significant, while a secondary measure favored CBT. A 2019 report by Dore and colleagues in the Journal of Psychoactive Drugs described 235 patients treated with ketamine-assisted psychotherapy across three practices and found decreases in depression and anxiety, but that study was observational, with no comparison group. For more on the broader model, see ketamine-assisted psychotherapy explained.

What the evidence does not show

It is important to be direct here. As of this writing, we are not aware of any randomized controlled trial of ketamine combined with IFS, for any condition. There is no controlled evidence that IFS improves ketamine outcomes more than CBT, EMDR, or general supportive therapy, and no research-based guidance on the best timing. What exists is clinical experience, case descriptions, training curricula, and a reasonable theoretical fit.

There is also a caution worth naming. Altered states can make people more suggestible, and parts work with trauma survivors can bring up intense or fragmentary material. Careful IFS therapists follow the client’s lead rather than suggesting content, and they treat what surfaces during an altered state as experience to explore slowly, not as settled fact. That care matters more than the label on the therapy. If a pairing is presented to you as a proven breakthrough, that is a signal to ask more questions.

How MCK coordinates with your IFS therapist

Music City Ketamine is a medical clinic, not a psychotherapy practice. We provide the infusion, the screening, and the monitoring. Integration therapy—IFS or otherwise—is referred out to licensed therapists in the community. Marla Peterson, CRNA, oversees every infusion, with anesthesia-level monitoring throughout and a clinician in the room.

In practice, that usually looks like this. With your written consent, we can talk with your therapist before your first infusion, share scheduling so that preparation and integration sessions fall close to your infusion days, and pass along relevant medical observations. The parts work itself happens in your therapist’s office, before and after the infusion, not in our treatment room. Most patients spend the infusion inward, with an eye mask and music. In some cases a credentialed therapist can attend a session by advance arrangement; can my therapist attend my ketamine session explains how that works and why it is case-by-case. If you are working on trauma, our overview of trauma-informed ketamine care describes how we handle choice, consent, and dissociation in the room.

Finding an IFS-informed therapist in Tennessee

If you do not have a therapist yet, start with our step-by-step guide to finding an integration therapist in Tennessee. A few IFS-specific points to add:

If your current therapist uses a different approach—CBT, EMDR, somatic work—that is not a reason to switch. Our piece on ketamine and EMDR integration covers one common alternative. Continuity with a therapist you trust often matters more than the model.

Honest expectations

Ketamine does not cure PTSD or depression, and IFS is not a shortcut through trauma. Research suggests ketamine can reduce symptoms meaningfully for a subset of people, and early studies suggest IFS may help with PTSD, depression, and chronic pain. Whether the two work better together than either alone is an open question. Some people respond strongly, some partially, and some not at all.

Sessions at Music City Ketamine are $475 each; therapy is billed separately by your therapist. For more reading, our trauma and PTSD pages gather related articles, including ketamine for PTSD and ketamine for complex PTSD. If you are already doing IFS work and wondering whether ketamine might support it, that is a good conversation to have with your therapist first, and then with us.