Ketamine for Fibromyalgia

 

Ketamine for Fibromyalgia Summary

Research into Ketamine for pain management shows it to be a safe alternative to opioids in emergency settings. A 2025 study has shown that 20-46% of patients achieved clinically meaningful improvements in pain management and found the benefits were sustained 6 months post treatment. A 2025 study found Ketamine to match the effect of opioids for immediate pain relief without the side effects. Overall the studies show that Ketamine is an effective tool for treating pain.

Fibromyalgia is a chronic disease that affects 2-4% of Americans or around 6-12 million people. 90% of patients who get Fibromyalgia tend to be female. Fibromyalgia is characterized by widespread muscoskeletal and chronic pain, accompanied by deep tissue tenderness, fatigue, lack of sleep, memory issues and mood disorders. Essentially Fibromyalgia affects the brain and affects how it processes pain signals. Symptoms are usually a constant dull ache. Fibromyalgia usually manifests in muscle/tendon points commonly called Fibromyalgia points. Ketamine is currently being explored for symptom control for Fibromyalgia, by using it to control pain to give patients a better quality of life.

1) Mechanism of Action

Ketamine is used as an analgesic, especially for severe acute pain and selected chronic pain syndromes.

  • NMDA receptor antagonism causes a reduction in glutamate-mediated pain transmission
  • Decreases central sensitization
  • Inhibits wind-up phenomenon
  • Enhances descending inhibitory pain pathways

These effects can help reset abnormal pain amplification in the central nervous system.

2) Clinical Indications

  • Severe refractory Fibromyalgia
  • Patients with chronic pain

Ketamine is often used as an adjunct rather than a first-line analgesic, but does not treat the underlying disease itself

3) Clinical Effects

  • Reduction in pain intensity
  • Decreased hyperalgesia
  • Improved fatigue and mood
  • Temporary improvement in function
  • Improved quality of life

In chronic pain, ketamine may sometimes provide relief that lasts beyond the infusion period by helping reset abnormal pain processing and can last for days and even weeks after the ketamine session. Repeated infusions can prolong the benefit.

4) Potential Advantages

  • Targets central pain mechanisms
  • Useful in opioid resistant pain
  • May reduce opioid dependency
  • May produce longer lasting relief

5) Limitations and Risks

  • Does not treat the disease itself, just helps with the pain
  • Variable response
  • Short duration of benefit in some cases
  • Need for monitoring at higher doses
  • Potential for misuse or dependence

6) Adverse Effects

  • Dissociation
  • Hallucinations or perceptual disturbances
  • Dizziness
  • Nausea/vomiting
  • Sedation
  • Increased blood pressure and heart rate

With repeated or long-term use

  • Cystitis (ketamine bladder syndrome)
  • Cognitive effects
  • Potential hepatotoxicity

7) Current Clinical Role

  • Not part of standard Fibromyalgia treatment
  • Reserved for treating refractory pain
  • Typically used as an adjunct to other analgesics