Status:
COMPLETED
Opioid and Cannabinoid Pharmacokinetic Interactions
Lead Sponsor:
University of California, San Francisco
Collaborating Sponsors:
National Institute on Drug Abuse (NIDA)
Conditions:
Pain
Eligibility:
All Genders
18+ years
Phase:
PHASE1
Brief Summary
We are conducting a study to assess whether smoking marijuana affects the safety of prescribed opioids in patients treated for chronic pain. This study will assess whether smoking cannabis affects the...
Detailed Description
Chronic pain conditions remain problematic, especially in patients with cancer. Although opioids are effective analgesics, dose-limiting side effects in the form of sedation, nausea and vomiting, and ...
Eligibility Criteria
Inclusion
- Ongoing analgesic therapy with either oxycodone hydrochloride (OxyContin) or morphine sulfate (MS Contin) every 12 hours for chronic pain.
- Eligible subjects will be ≥ 18 years of age with a diagnosis of chronic pain and an estimated survival of greater than six months.
- Subjects must be on a stable dose of opioid medication for at least 2 weeks before enrollment.
- Current other analgesic medications will be maintained during the study. The subject must have been on a stable medication regimen for at least 2 weeks.
- The following laboratory parameters documented within 45 days prior to study entry:
- Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 5 X upper limit of normal (ULN)
- Total bilirubin ≤ 2 X ULN
- Creatinine ≤ 2.0 mg/dL (177 µmol/L)
- All men and women in this study must agree to use adequate birth control during this study. Acceptable barrier birth control methods are a male condom, female condom, diaphragm, or intra-uterine (IUD).
- All women of reproductive potential (who have not reached menopause or undergone hysterectomy, oophorectomy, or tubal ligation) must have a negative urine b-HCG pregnancy test performed before initiating the protocol-specified medication.
- Prior history of use of marijuana. Subjects must have smoked marijuana on at least 6 occasions in their lifetime prior to enrollment.
- Able to understand and follow the instructions of the investigator, including completing the pain intensity rating scales.
- Karnofsky Performance Score \>60.
- Able and willing to provide informed consent.
Exclusion
- Severe coronary artery disease, uncontrolled hypertension, cardiac ventricular conduction abnormalities, or orthostatic mean blood pressure drop greater than 24 mmHg, severe chronic obstructive pulmonary disease.
- History of renal or hepatic failure.
- Evidence of hepatic, hematological or renal dysfunction based on judgment of physician.
- Active substance abuse (e.g., alcohol or injection drugs).
- Use of smoked marijuana within 30 days of enrollment verified with a urine THC level.
- Neurologic dysfunction or psychiatric disorder severe enough to interfere with assessment of pain or sensory systems.
- Current use of smoked tobacco products or a confirmed cotinine level.
- Women who are pregnant or breast-feeding may not take part in this study.
- Unable to read or speak English.
Key Trial Info
Start Date :
May 1 2006
Trial Type :
INTERVENTIONAL
Allocation :
ACTUAL
End Date :
March 1 2009
Estimated Enrollment :
24 Patients enrolled
Trial Details
Trial ID
NCT00308555
Start Date
May 1 2006
End Date
March 1 2009
Last Update
December 9 2016
Active Locations (1)
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1
Community Consortium
San Francisco, California, United States, 94110