Clinical Trials Directory

Opiate-Induced Tolerance & Hyperalgesia in Pain Patients

Opiates such as morphine are the cornerstone medications for the treatment of moderate to severe pain. Recent evidence suggests that pain patients on chronic opioid therapy become more sensitive to pain (hyperalgesia) over time. There is also a long-standing notion that analgesic tolerance to opioids (habituation) develops during chronic use even though this phenomenon has never been prospectively studied. Our specific aims propose to prospectively test the hypotheses that; 1) Pain patients on chronic opioid therapy develop dose-dependent tolerance and/or hyperalgesia to these medications over time, 2) Opioid-induced tolerance and hyperalgesia develop differently with respect to various types of pain, 3) Opioid-induced hyperalgesia occurs independently of withdrawal phenomena, and 4) Opioid-induced tolerance and hyperalgesia develop differently based on gender and/or ethnicity. This proposed study will be the first quantitative and prospective study of tolerance and hyperalgesia in pain patients and will have important implications for the rational use of opioids in the treatment of chronic pain.

Stanford is not currently accepting new patients for this trial. You may want to check clinicaltrials.gov to see if other locations are recruiting.

Investigator(s):

Intervention(s):

  • drug : Morphine
  • drug : Placebo

Phase: Phase 4

Eligibility

Ages Eligible For Study:

18 Years - 70 Years

Inclusion Criteria

- opioid na´ve (or less than 4 vicodin equiv/day) - 18-70 years old - candidate for opioid therapy for nonmalignant pain.

External Links

Contact information

Primary Contact:

Lawrence Chu 6507236411

Stanford University School of Medicine 300 Pasteur Drive Stanford, CA 94305

Stanford Medicine Resources:

Footer Links: