Ketamine for Chronic Pain
Find clinics offering ketamine therapy for chronic pain conditions including fibromyalgia, CRPS, and neuropathic pain.
Reviewed for clinical accuracy against peer-reviewed literature and FDA guidelines · Last reviewed March 2026
💉 Ketamine Therapy for Chronic Pain: What You Need to Know
Chronic pain affects an estimated 50 million Americans and is one of the leading causes of disability worldwide. For patients with conditions like complex regional pain syndrome (CRPS), fibromyalgia, neuropathic pain, and central sensitization syndromes, conventional pain management options — including opioids, nerve blocks, and physical therapy — often provide incomplete relief. Ketamine infusion therapy has become an increasingly important tool in the chronic pain treatment arsenal.
Unlike opioid medications, which carry significant risks of addiction, tolerance, and overdose, ketamine works through the NMDA receptor system to address the underlying neurological mechanisms that sustain chronic pain. Ketamine infusions for chronic pain are typically administered at higher doses and over longer durations than those used for depression, often lasting 4-8 hours per session compared to the standard 40-minute depression infusion.
Ketamine clinics specializing in chronic pain management offer individualized protocols tailored to specific pain conditions. CRPS patients, in particular, have shown remarkable responses to ketamine therapy, with some experiencing sustained pain relief that allows them to reduce or eliminate opioid medications. Many pain-focused ketamine programs work in conjunction with the patient's existing pain management team to provide comprehensive, multimodal care.
How Ketamine Works for Chronic Pain
Ketamine treats chronic pain primarily through NMDA receptor blockade, which interrupts a process called central sensitization — a condition in which the central nervous system amplifies pain signals, causing patients to experience heightened pain responses to stimuli that would not normally be painful. By blocking NMDA receptors, ketamine essentially "resets" these malfunctioning pain circuits and reduces the phenomenon known as "wind-up," where pain signals become progressively amplified.
Ketamine also reduces opioid tolerance through its NMDA antagonism, meaning patients on chronic opioid therapy may experience improved pain relief from their existing medications after ketamine treatment. Additionally, ketamine has anti-inflammatory properties mediated through its effects on cytokine production and microglial activation, which contribute to its pain-relieving effects. For conditions like CRPS, ketamine may also help normalize sympathetic nervous system dysfunction that drives the disease process.
Clinical Evidence
A landmark study by Sigtermans et al. (2009) demonstrated that a continuous ketamine infusion over 4 days produced sustained pain relief in CRPS patients lasting an average of 11 weeks after treatment. Multiple systematic reviews have confirmed ketamine's efficacy for neuropathic pain, CRPS, and fibromyalgia. For CRPS specifically, response rates of 60-80% have been reported in clinical series, with some patients achieving complete remission of symptoms. Ketamine infusions for pain are typically longer (4-8 hours) and may involve multi-day protocols compared to the shorter infusions used for mood disorders.
Who Is a Candidate?
Ideal candidates for ketamine pain therapy include patients diagnosed with CRPS (complex regional pain syndrome), fibromyalgia, neuropathic pain conditions (diabetic neuropathy, post-herpetic neuralgia, peripheral neuropathy), central sensitization syndromes, and chronic pain that has failed to respond to conventional treatments. Patients who are seeking to reduce opioid dependence or those who have developed opioid tolerance are also good candidates. Patients should have a confirmed chronic pain diagnosis from a pain specialist and have typically tried and failed multiple conventional pain management approaches.
Side Effects to Consider
Side effects during ketamine infusions for chronic pain may be more pronounced than in shorter depression infusions due to the longer treatment duration and potentially higher doses used. Common side effects include dissociation, vivid dreams or hallucinations, nausea (which can be managed with anti-emetics), dizziness, and temporary increases in blood pressure. Some patients experience fatigue or cognitive "fogginess" for 24 hours after longer infusions. Patients with chronic pain conditions are monitored throughout the extended infusion period, and doses are titrated to balance pain relief with tolerability.
Frequently Asked Questions
Common questions about ketamine therapy for chronic pain conditions including fibromyalgia, CRPS, and neuropathic pain.
Does ketamine work for chronic pain?
Yes, ketamine is an established treatment for several chronic pain conditions, particularly CRPS (complex regional pain syndrome), fibromyalgia, and neuropathic pain. It works by blocking NMDA receptors to interrupt central sensitization — the neurological process in which the central nervous system amplifies and sustains pain signals, causing patients to experience heightened responses to stimuli that would not normally be painful. A landmark study by Sigtermans et al. (2009) demonstrated that continuous IV ketamine infusion produced sustained pain relief in CRPS patients lasting an average of 11 weeks after treatment. For CRPS specifically, response rates of 60–80% have been reported in clinical series. Unlike opioid medications, ketamine addresses the underlying neurological drivers of chronic pain rather than simply masking pain signals, and it does not carry the risks of physical dependence or respiratory depression. Consult a pain specialist experienced with ketamine protocols to determine whether your specific pain condition is likely to respond to this treatment.
How long does ketamine pain relief last?
The duration of pain relief from ketamine varies significantly by condition and treatment protocol. For CRPS, the study by Sigtermans et al. (2009) showed sustained relief lasting an average of 11 weeks after a multi-day continuous infusion series, with some patients achieving even longer remission periods. For other chronic pain conditions such as fibromyalgia and neuropathic pain, relief typically lasts 2–8 weeks following a standard treatment course. Ketamine infusions for chronic pain are administered at higher doses and over longer durations than those used for depression — often 4–8 hours per session compared to the standard 40-minute mood disorder infusion — which contributes to the extended duration of pain relief. Maintenance infusions are usually needed to sustain benefits over time, with the frequency determined by individual response patterns. Some patients find that combining ketamine with physical therapy, nerve blocks, or other multimodal pain management strategies extends the duration of relief between sessions. Work closely with your pain management team to optimize your personal treatment schedule.
Is ketamine better than opioids for chronic pain?
Ketamine and opioids work through fundamentally different mechanisms and serve different roles in chronic pain management. Ketamine addresses central sensitization — the underlying neurological driver of many chronic pain conditions — by blocking NMDA receptors and resetting malfunctioning pain circuits, while opioids primarily mask pain signals through mu-opioid receptor activation. Critically, ketamine does not carry the risks of physical dependence, respiratory depression, tolerance escalation, or overdose death that are associated with long-term opioid use, which claims over 80,000 American lives annually. Ketamine also reduces opioid tolerance through its NMDA antagonism, meaning patients on chronic opioid therapy may experience improved pain relief from their existing medications after ketamine treatment. The ASRA/AAPM/ASA consensus guidelines (Cohen et al., 2018) established evidence-based recommendations for using IV ketamine infusions in chronic pain management. Many pain specialists now use ketamine strategically to help patients reduce or eliminate opioid dependence while maintaining adequate pain control.
What types of pain does ketamine treat?
Ketamine is most effective for pain conditions that involve central sensitization or neuropathic mechanisms, including CRPS (complex regional pain syndrome), where response rates of 60–80% have been reported in clinical series, as well as diabetic neuropathy, peripheral neuropathy, post-herpetic neuralgia, and fibromyalgia. It also shows promise for phantom limb pain, central sensitization syndromes, and certain types of chronic headache and migraine disorders. Ketamine is generally less effective for purely nociceptive pain such as osteoarthritis or mechanical back pain, where the pain signals originate from tissue damage rather than nervous system dysfunction. The key distinction is whether your pain involves the nervous system amplifying signals beyond what the physical injury would normally produce. A pain specialist experienced with ketamine protocols can evaluate your specific condition, review your imaging and diagnostic workup, and determine whether ketamine infusion therapy is likely to provide meaningful relief for your particular pain profile.
References
- Sigtermans MJ et al. (2009) Pain. Continuous IV ketamine infusion produced effective and long-term pain relief in Complex Regional Pain Syndrome Type 1 patients. [DOI]
- Cohen SP et al. (2018) Reg Anesth Pain Med. ASRA/AAPM/ASA consensus guidelines established evidence-based recommendations for IV ketamine infusions in chronic pain management. [DOI]
- Orhurhu V et al. (2019) Anesth Analg. Meta-analysis of RCTs found ketamine infusions provided significant short- to medium-term analgesic benefit in chronic pain conditions. [DOI]
Treatment Types for Chronic Pain
Explore the different ways ketamine therapy can be administered for chronic pain conditions including fibromyalgia, CRPS, and neuropathic pain.
IV Ketamine Infusion
Intravenous delivery. Fastest onset, 60-70% response rate. $400-800/session.
Spravato (Esketamine)
FDA-approved nasal spray. Often insurance-covered. $590-885/session.
IM Injection
Intramuscular injection. Similar efficacy, lower cost. $250-500/session.
KAP (Ketamine-Assisted Psychotherapy)
Combines ketamine with guided psychotherapy. $500-1,500/session.