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RecruitingAccepts healthy volunteersEarly Phase 1

Brain Mechanisms Supporting Cannabis-induced Pain Relief

University of California, San Diego · NCT04982965

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Opens the official ClinicalTrials.gov record, with the study team’s contacts. Bored Studies doesn’t enroll anyone.

Key facts

Compensation
Not posted. Ask the study team before screening.
Who can join
Ages 21–65 · All sexes
Healthy volunteers
Accepted
Study type
Interventional · Early Phase 1
Target enrollment
100
US sites recruiting
1
Study start
May 7, 2021
Record last updated
June 3, 2026

Status re-checked against ClinicalTrials.gov within the last 12 hours.

What the study is about

Chronic low back pain is a common and disabling condition that affects millions of people in the United States. Many people with chronic low back pain do not get enough relief from current treatments. Cannabis may help reduce pain, but researchers do not fully understand how it affects the brain in people with chronic pain. The purpose of this study is to examine how inhaled cannabis changes brain activity and reduces pain in people with chronic low back pain. Results from this study may help researchers better understand how cannabis works for pain and support the development of improved pain treatments.

Being studied: Active Cannabis; Placebo Cannabis

Conditions: Sciatica; Lumbar Radiculopathy; Lower Back Pain; Degenerative Disc Disease; Chronic Low-back Pain (cLBP); Chronic Low Back and Leg Pain; Back Pain

Eligibility criteria

Copied from the official record. The study team makes the final decision at screening.

Show full criteria

Inclusion Criteria

  • Between 21-65 years old
  • Currently 30 days cannabis free
  • Lower back pain for three months or more
  • Are not taking opioids
  • If female and of a child bearing potential age, are not pregnant or nursing mothers
  • Do not have mental or neurological conditions inhibiting sensory/motor functions
  • Do not have a lifetime history of dependence on cannabis
  • Do not have a lifetime history of DSM-IV schizophrenia, bipolar disorder, panic disorder, or psychosis
  • Prior THC-containing cannabis experience within the past two years
  • Agrees not to use cannabis outside of the study during participation in the study
  • Agrees not to use opioids or barbiturates during participation in the study
  • Agrees not to drive a motor vehicle within 4 hours following last use of inhaled cannabis during participation in the study

Exclusion Criteria

  • Active pulmonary disease
  • Allergy or past adverse effects or negative past experiences from cannabis
  • Positive urine drug test for THC, barbiturates, opioids, oxycodone, or methadone
  • Any significant illness, including cardiovascular disease, diabetes, renal and liver disease.
  • Any current or history of an immunocompromising disease or condition (such as lupus, psoriasis, multiple sclerosis, etc.)
  • Any current or history of neurologic conditions, including Parkinson disease, dementia, cognitive impairment, history of seizure disorder, and history of traumatic brain injury/head injury
  • Any current major psychiatric illness, such as bipolar disorder, major depression, psychosis, substance use disorder, or schizophrenia
  • Any current or history of suicidal ideation or attempt
  • Overt sensitivity to thermal stimulation
  • Resting blood pressure > 140/90
  • Resting heart rate > 100 beats/minute
  • Prisoner
  • Institutionalized
  • Claustrophobia
  • MRI contraindications
  • Participation in any new (within 2 weeks prior or any time after enrollment) pain management procedures during the study period
  • Known history of vasovagal fainting, syncope, or severe adverse reactions associated with blood draws or needle procedures

Recruiting US locations

  • Center for Functional MRI - W.M.Keck Building

    La Jolla, CA 92093

    Site contact: Madelynn Meredith, BS · 619-431-1850 · mameredith@health.ucsd.edu

Study contacts (from the official record)

  • Madelynn Meredith, BS · 619-431-1850 · mameredith@health.ucsd.edu
  • Yasmeen Esshaki, MA · 619-786-0375 · yesshaki@health.ucsd.edu
All pain studies in California →
Brain Mechanisms Supporting Cannabis-induced Pain Relief (NCT04982965) | Bored Studies