The short version
- Ketamine treats pain through NMDA-receptor blockade, a mechanism relevant to central sensitization.
- Systematic reviews of randomized trials show mixed results — some benefit for neuropathic pain and CRPS, weaker evidence for fibromyalgia and other conditions.
- Pain doses are often higher and infusions longer than in psychiatric protocols.
- Bladder toxicity (ketamine-induced cystitis) is a documented risk of repeated or high-dose use.
- It is an adjunct, not a standalone cure — pain programs combine it with physical therapy and behavioral care.
Why ketamine is used for pain
Chronic pain often involves central sensitization — the nervous system amplifying pain signals. Ketamine blocks NMDA receptors, which participate in that amplification, giving it a mechanism most analgesics lack. Anesthesiologists have used it for perioperative and refractory pain for decades.
What the evidence supports
Systematic reviews and meta-analyses of randomized trials over the past two decades report short-term pain reduction for sub-anesthetic ketamine in several chronic pain conditions, with the most consistent findings in neuropathic pain and CRPS. Trial quality is variable, effect sizes are modest, and how long relief lasts is not well established. Fibromyalgia evidence is weaker and mixed.
What treatment looks like
Pain-infusion protocols vary widely: single infusions lasting a few hours, repeat infusions over one to two weeks, or — for severe CRPS — multi-day inpatient regimens under anesthesia in specialized centers. Most programs combine infusions with physical rehabilitation and pain psychology, because ketamine alone rarely produces durable improvement.
Safety
Higher and repeated dosing raises the stakes: blood-pressure and heart-rate elevation during infusion, hallucinations or vivid dreams, liver enzyme changes with prolonged use, and ketamine-induced cystitis with heavy repeated exposure. Cardiac screening and bladder monitoring are standard parts of reputable pain programs. If chronic pain coexists with depression and crisis thoughts, 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 chronic pain diagnosis such as neuropathic pain, CRPS, or fibromyalgia
- Failure of conventional pain management, documented by a treating clinician
- Cardiovascular, liver, and bladder health reviewed before treatment
- No uncontrolled hypertension, unstable heart disease, or active substance use disorder
- Realistic expectations: relief is often partial and temporary
Questions people ask
Is ketamine approved for pain?
Ketamine is FDA-approved as an anesthetic, and anesthesiologists use it routinely in surgery. Treating chronic pain conditions with repeated infusions is off-label, though it has decades of clinical use in pain medicine.
Which pain conditions have the best evidence?
Reviews of randomized trials find the most consistent signals for neuropathic pain and complex regional pain syndrome (CRPS), where ketamine can reduce pain intensity short-term. Results for fibromyalgia and mixed chronic pain populations are less consistent.
How is a pain infusion different from a depression infusion?
Pain protocols usually use longer infusions — several hours — and sometimes higher cumulative doses, occasionally over consecutive days. Monitoring is more intensive, and cardiac and blood-pressure screening is more rigorous.
What are the long-term risks?
Repeated high-dose ketamine can damage the bladder (ketamine-induced cystitis) and carries cognitive and dependency risks. That is why pain programs limit total exposure and monitor kidney and bladder function.
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.
Depression (major depressive disorder)
Ketamine-based treatments act on glutamate, a different pathway from traditional antidepressants, and can work within hours to days for some patients. Only esketamine is FDA-approved, and only for specific depression populations; other routes are off-label.
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.
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.