What Does Ketamine Therapy Actually Do? A Complete Guide

Ketamine therapy has been generating serious attention in psychiatry for the past two decades, but the coverage rarely answers the most practical question patients have: what does it actually do? Not the mechanism in isolation, and not the patient testimonial in isolation, but the full picture of what happens in the brain, what the experience is like, and what changes afterward. At Soft Reboot Wellness in Menlo Park, we think patients make better decisions when they understand their treatment rather than just consenting to it. This is our attempt at a complete answer.

What Ketamine Does in the Brain

Ketamine’s primary action is on NMDA receptors (N-methyl-D-aspartate receptors), which are part of the glutamate system (the brain’s main excitatory neurotransmitter network). By temporarily blocking these receptors, ketamine triggers a cascade of downstream effects that standard antidepressants (which work through serotonin and norepinephrine) do not produce (National Institutes of Health).

The most clinically important of these downstream effects is a rapid increase in synaptic plasticity: the brain’s ability to strengthen and reorganize connections between neurons. In depression, anxiety, and PTSD, neural circuits involved in mood regulation, fear processing, and self-referential thinking tend to become rigid and entrenched. Ketamine disrupts that rigidity. Research shows it promotes neuroplasticity in ways that standard antidepressants approximate only after weeks of daily dosing, and ketamine can produce this effect within hours of a single infusion (National Institutes of Health).

Ketamine also increases BDNF (brain-derived neurotrophic factor), a protein that supports neuron survival, growth, and the formation of new synaptic connections (National Institutes of Health). BDNF is often depleted in people with depression, and restoring it is thought to be one of the mechanisms through which antidepressant effects are sustained beyond the immediate post-infusion period. Additionally, emerging research published in Nature suggests ketamine may interact with the brain’s opioid system as a secondary mechanism, pointing to a treatment with more than one pathway of therapeutic action (Nature).

What Ketamine Therapy Does Clinically

The clinical picture that emerges from research is striking. Ketamine produces rapid and significant antidepressant effects, often within hours, in patients who have not responded to multiple prior treatments (National Institutes of Health). For patients with treatment-resistant depression, anxiety, or PTSD, this speed is not a minor detail. It represents a fundamentally different experience of treatment: rather than waiting six to eight weeks to know whether a medication is working, patients often know within days.

The effects of a single infusion are real but typically time-limited, most patients experience meaningful symptom relief for days to weeks following the first session. This is why a series of infusions is the standard approach rather than a single treatment. Research shows that both single and repeated ketamine infusions can treat depression and related conditions, with repeated infusions extending the duration and depth of benefit (American Journal of Psychiatry). Our standard induction protocol at Soft Reboot Wellness involves four to six IV infusions over four to six weeks, personalized to your clinical response.

Ketamine-assisted psychotherapy (KAP) pairs infusions with structured preparation and integration work, and research supports the combination producing more durable outcomes than ketamine alone (National Institutes of Health). Our KAP program includes a preparation session, two 2-hour in-office infusion sessions, and integration coaching with a certified psychedelic integration coach.

What the Experience Is Like

Patients considering ketamine therapy understandably want to know what they are signing up for on a sensory level. The honest answer is that experiences vary, but certain qualities are consistent.

During an IV ketamine infusion, patients typically notice the onset of effects within minutes. The experience often includes a sense of mental quieting, a loosening of the grip of ordinary anxious or depressive thought patterns. Some patients describe mild perceptual shifts: altered time perception, a floating or dreamlike quality, or vivid inner imagery. Some experience emotional content that feels meaningful or revealing. Others find it largely calm and neutral.

What the experience is not: frightening in the way many patients expect. The dissociative quality that makes some people hesitant tends, in practice, to feel more like relief than threat for most patients in a supervised clinical setting. Dr. Sara Herman personally monitors all infusion sessions at our Menlo Park clinic. Vital signs are tracked continuously. The altered state resolves fully before patients leave, typically within an hour of the infusion ending, and patients are required to have a ride home.

The 48 to 72 hours following a session are considered particularly significant for integration: the neuroplastic window opened by the infusion is still active, and this is an optimal time for reflection, journaling, and the kind of internal work our integration coaching is designed to support.

What Ketamine Therapy Does Not Do

Being clear about limitations is as important as explaining the evidence. Ketamine therapy is not a cure, and we do not present it as one. Results vary by individual, and some patients do not respond to ketamine in the way they hope. Some patients require ongoing maintenance infusions, single booster sessions typically scheduled three weeks to three months after the initial series, to sustain the benefits they achieve during induction.

Ketamine’s mental health applications are also off-label. The medication has been FDA-approved as an anesthetic since 1970, and its safety profile at therapeutic doses is well-established. But its use for depression, anxiety, and PTSD has not received formal FDA approval for those specific psychiatric indications, which means insurance coverage is inconsistent. We are transparent about this from the start of the process, contact our team at 650-419-3330 or hello@softrebootwellness.com before your consultation to discuss the financial realities clearly.

Ketamine is also not appropriate for everyone. Patients with certain psychiatric histories, active substance use disorders, or specific medical conditions may not be suitable candidates. Every patient undergoes a thorough medical and psychiatric review before any treatment is recommended, and we will tell you honestly if we think a different approach is better suited to your situation.

How Soft Reboot’s Approach Shapes the Outcome

The same medication administered in different contexts produces different results. This is not a marketing claim. It is a documented feature of how ketamine works. Research on KAP shows that the integration of psychotherapy with infusion treatment improves outcomes relative to infusion alone, which is why our clinical model is built around that integration rather than treating it as optional (National Institutes of Health).

Dr. Herman’s credentials reflect this philosophy directly. She holds an Advanced Certificate in Psilocybin-Assisted Therapy from the Integrative Psychiatry Institute, has completed training in Internal Family Systems (IFS) combined with ketamine-assisted psychotherapy, and has personally guided more than 10,000 patients through anesthesia, pain management, and ketamine therapy over her career. Dr. Natasha, our board-certified anesthesiologist who trained at UCSF, brings additional clinical depth to the monitoring and safety dimension of every session.

We also use the Osmind EHR and mood-tracking platform to document your progress throughout treatment. This means your response is tracked objectively, not reconstructed from memory at occasional check-ins, and can be reviewed alongside your existing treatment team if you have one. We actively coordinate with outside providers, with your consent, because we believe integrative care produces better outcomes than any single clinic working in isolation. You can learn more on our frequently asked questions page.

Frequently Asked Questions

How long does the antidepressant effect of ketamine last after an infusion series? For most patients completing a standard induction series, the reduction in depressive symptoms lasts approximately five weeks on average, with a range of roughly three weeks to two months. Individual responses vary considerably. Maintenance infusions, single booster sessions, can be used to sustain the benefit when symptoms begin to return, and some patients find they need these infrequently while others use them more regularly.

Does ketamine therapy work better for some conditions than others? The strongest evidence base exists for treatment-resistant depression and PTSD, both of which are conditions we treat at Soft Reboot Wellness. There is also meaningful clinical evidence for ketamine’s effectiveness in anxiety. We assess the fit between your diagnosis and the available evidence during your consultation, so our recommendation is grounded in what the research actually supports for your specific presentation.

Will I remember my infusion sessions? Most patients retain some memory of the experience, though the altered quality of consciousness during infusion means those memories may be impressionistic rather than sequential. Patients are encouraged to journal or reflect in the hours and days following their session, while the experience is still accessible. Our integration coaching component is specifically designed to help you make sense of and work with whatever arises.

Can ketamine therapy be used alongside talk therapy or other psychiatric treatment? Yes, and we actively encourage it. Ketamine therapy works well as a complement to ongoing psychotherapy, many patients find their therapy deepens during and after a ketamine series, precisely because the neuroplastic window makes habitual thought patterns more available for examination. We coordinate with outside therapists and psychiatrists with your consent throughout your treatment.

Key Takeaways

• Ketamine works through NMDA receptor blockade in the glutamate system, triggering rapid neuroplasticity and BDNF increases that standard antidepressants do not produce on the same timeline.
• Clinical research documents significant antidepressant and anti-PTSD effects that often appear within hours, a fundamentally different experience from the weeks-long timeline of standard medications.
• The experience during infusion is time-limited, monitored, and for most patients more calming than distressing.
• Ketamine is an off-label treatment for mental health conditions; insurance coverage is inconsistent, and candidacy is determined individually through a medical and psychiatric review.
• Results vary by individual; combining ketamine with integration support, as in our KAP program, is associated with more durable outcomes.

Understanding what ketamine therapy does is the first step toward knowing whether it might be right for you. We are glad to continue that conversation in person. Call us at 650-419-3330 or email hello@softrebootwellness.com to schedule a consultation at our Menlo Park clinic.

References

1. National Institutes of Health. Ketamine works by blocking NMDA receptors in the glutamate system, producing rapid antidepressant effects through a mechanism distinct from traditional antidepressants. https://pmc.ncbi.nlm.nih.gov/articles/PMC5148235/
2. National Institutes of Health. NMDA receptors play a central role in synaptic plasticity and are the primary target of ketamine’s antidepressant action. https://pmc.ncbi.nlm.nih.gov/articles/PMC9965111/
3. National Institutes of Health. Ketamine has been shown to increase brain-derived neurotrophic factor (BDNF), a protein essential for neuron growth and long-term mood regulation. https://pubmed.ncbi.nlm.nih.gov/39684808/
4. Nature. Research suggests ketamine may also produce antidepressant effects by interacting with the brain’s opioid system, pointing to multiple mechanisms of action. https://www.nature.com/articles/s41591-025-03800-w
5. National Institutes of Health. Ketamine has demonstrated rapid and significant antidepressant effects in clinical studies, often working within hours when traditional medications take weeks. https://www.nimh.nih.gov/news/science-updates/2024/new-hope-for-rapid-acting-depression-treatment
6. American Journal of Psychiatry. Research shows that both single and repeated ketamine infusions can treat treatment-resistant depression, with maintenance infusions extending the duration of benefit. https://psychiatryonline.org/doi/10.1176/appi.ajp.2018.18070834
7. National Institutes of Health. Research supports the integration of psychotherapy with ketamine treatment, showing that the combination may produce more durable and meaningful outcomes than ketamine alone. https://pmc.ncbi.nlm.nih.gov/articles/PMC9207256/

Medical Disclaimer: The information in this blog is for educational purposes only and does not constitute medical advice. Ketamine therapy should only be pursued under the supervision of a licensed medical provider familiar with your full medical and psychiatric history. Individual results vary. Off-label treatments like IV ketamine for mental health conditions carry risks that should be discussed thoroughly with a qualified provider before beginning. If you are experiencing a mental health crisis or thoughts of self-harm, please call or text 988 to reach the Suicide and Crisis Lifeline or go to your nearest emergency room.