The short version
- Ketamine and esketamine act on the glutamate system, a different mechanism from SSRIs and SNRIs.
- Rapid response is the distinguishing feature — improvement, when it happens, is often measured in hours to days.
- Not everyone responds; a structured induction course is how clinicians judge whether it works for you.
- Oral ketamine taken at home without supervision is not a recognized clinical protocol and carries real risks.
- Every route requires clinical monitoring because of sedation, dissociation, and blood-pressure effects.
Why ketamine changed the conversation
For decades, depression treatment centered on monoamine antidepressants that take weeks to show benefit — if they work at all. Ketamine's rapid effects in depressed patients, first reported in controlled trials in the 2000s, established glutamate signaling as a new treatment pathway and led to the development of esketamine.
What is actually approved
Esketamine nasal spray (SPRAVATO®) carries the only FDA approvals for a ketamine-based psychiatric medicine: treatment-resistant depression in adults, and depressive symptoms in adults with major depressive disorder who have acute suicidal ideation or behavior, in both cases alongside an oral antidepressant. Importantly, its effectiveness in preventing suicide has not been demonstrated, and it does not replace hospitalization when that is clinically needed.
The off-label routes
IV ketamine infusions, IM injections, and oral ketamine are all used for depression in clinical practice, supported by randomized trials, systematic reviews, and meta-analyses — most extensively for IV. Because none of these is FDA-approved for depression, clinics set their own protocols, insurers generally decline coverage, and quality varies between providers. A reputable clinic will screen your medical history, monitor every session, and coordinate with your existing prescriber.
Judging whether it works
Clinicians measure response with structured scales during the induction course. If meaningful improvement does not appear, continuing is hard to justify; if it does, maintenance frequency is tailored to how long benefits last for you. Combining ketamine-based treatment with ongoing psychotherapy and standard antidepressant care is common.
Safety
Expect possible dissociation, dizziness, nausea, and temporary blood-pressure rises during or after dosing. Repeated unsupervised use risks bladder damage and dependence. Treatment belongs in a monitored setting. If you are in crisis, call or text 988.
What a course of treatment looks like
- 1
Consultation and eligibility
A qualified healthcare professional reviews your diagnosis, treatment history, medicines, and safety risks before determining which treatment approach, if any, is appropriate.
- 2
Pricing, and coverage if it applies
IV, IM, and oral ketamine are off-label and usually self-pay, so ask for a written price for the full course. Only SPRAVATO® (esketamine) is commonly insurance-covered, typically after prior authorization.
- 3
A monitored treatment visit
Depending on the route, you receive an IV infusion, an IM injection, or a supervised oral dose — or, for SPRAVATO®, self-administer the nasal spray — while staff monitor your vital signs.
- 4
Recovery and a ride home
You rest until the effects wear off (at least two hours after SPRAVATO®). Arrange a ride home and do not drive until the next day after restful sleep.
- 5
Individualized follow-up
The prescriber assesses benefit, tolerability, and ongoing need, including whether maintenance sessions make sense for you.
Eligibility
Could ketamine treatment be an option to discuss?
A clinic confirms all of this at your consultation. Use it to see whether a consultation is worth booking.
- A diagnosis of major depressive disorder made by a qualified clinician
- Symptoms persisting despite standard antidepressant treatment, for the approved uses
- Review of heart, blood pressure, liver, and bladder health before starting
- No current psychosis or unstable substance use disorder
- Ability to attend in-person monitored sessions and arrange a ride home
Questions people ask
How is this different from regular antidepressants?
Most antidepressants act on serotonin or related monoamine systems over weeks. Ketamine and esketamine act on glutamate signaling, and their effects — when they occur — appear much faster. They are add-on or alternative options, not replacements a patient switches to on their own.
Which route of ketamine is best for depression?
IV racemic ketamine has the largest published evidence base, esketamine has the FDA label, and IM and oral routes have smaller studies. The right route depends on your diagnosis, history, budget, and what a qualified prescriber recommends after assessment.
Do the effects last?
Single-course benefits fade over days to weeks for most people, which is why maintenance scheduling exists. Long-term data is still developing, and prescribers should periodically re-justify ongoing treatment.
Is oral ketamine at home ever appropriate?
Some prescribers use low-dose oral ketamine as part of a closely supervised plan, but unsupervised at-home use is not a recognized protocol and carries risks of misuse, bladder injury, and unmonitored sedation.
Other conditions we cover
Treatment-resistant depression
Depression that has not responded adequately to at least two oral antidepressants. Esketamine nasal spray (SPRAVATO®) is FDA-approved for this use in adults; IV, IM, and oral ketamine are off-label options that many clinics offer.
Anxiety disorders
Early evidence from randomized trials and meta-analyses suggests ketamine can reduce anxiety symptoms short-term, including in people whose anxiety has resisted other treatments. All such use is off-label — no ketamine-based medicine is FDA-approved for anxiety.
PTSD
Ketamine is being studied and used off-label for post-traumatic stress disorder, with early trials suggesting rapid but temporary symptom reduction. Esketamine is not approved for PTSD, and treatment should be coordinated with trauma-focused therapy.
Chronic pain
Ketamine is an FDA-approved anesthetic, but its use for chronic pain conditions — neuropathic pain, complex regional pain syndrome, fibromyalgia — is off-label. Evidence is mixed, with some support for neuropathic and CRPS pain.
OCD
Early research on ketamine for obsessive-compulsive disorder shows mixed and short-lived results in small trials. It remains off-label and experimental — standard care is still exposure-based therapy with SSRIs.
Ketamine treatment centers near you
Browse clinics by town or county, or read more about treatment in United States.
This guide is general information, not medical advice. Only a prescriber who knows your history can say whether ketamine treatment, including SPRAVATO® (esketamine), is right for you. If you are in crisis, call or text 988.