Do hallucinogenics affect chronic pain? As noted in a previous question, hallucinogenics, such as psilocybin, have been used to treat depression with some success. Chronic pain is affected somewhat by a top-down process from the brain, as shown in neurofeedback treatment via EEG. Have hallucinogenics been shown to be an effective treatment for chronic pain?
According to the National Institute for Drug Abuse


  Some hallucinogens interfere with the action of the brain chemical serotonin, which regulates:
  
  
  mood
  sensory perception
  sleep
  hunger
  body temperature
  sexual behavior
  muscle control
  
  
  Other hallucinogens interfere with the action of the brain chemical glutamate, which regulates:
  
  
  pain perception
  responses to the environment
  emotion
  learning and memory
  


Morphine is a hallucinogenic and

Morphine is used to treat chronic pain

The NHS has also provided proof with links to articles that opiates are useful for chronic pain

Other hallucinogenics known to help with pain include Peyote (unreferenced)