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OXY-2: The Pharmacogenetics of Oxycodone Analgesia in Human Experimental Pain Models

This study has been completed.
Information provided by:
Odense University Hospital Identifier:
First received: January 3, 2006
Last updated: January 29, 2007
Last verified: January 2007
Thirty-two healthy volunteers will be submitted to experimental pain and on the 2 study days receive Oxycodone 20 mg po vs. placebo. Half of the volunteers will be poor metabolizers according to CYP2D6 genotype and half will be extensive metabolizers (EM) and have an enzyme with normal function. The study hypothesis is that PM will experience less pain relief than EM.

Condition Intervention Phase
Drug: Oxycodone
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double-Blind
Primary Purpose: Treatment
Official Title: The Pharmacogenetics of Oxycodone Analgesia in Human Experimental Pain Models

Resource links provided by NLM:

Further study details as provided by Odense University Hospital:

Primary Outcome Measures:
  • Pain threshold and tolerance measured by electrical stimulation and pain intensity measured by cold pressor test.

Secondary Outcome Measures:
  • The above compared to SNPs. Plasma levels of oxycodone and metabolites.

Estimated Enrollment: 32
Study Start Date: February 2006
Estimated Study Completion Date: January 2007
Detailed Description:

Oxycodone is a semi-synthetic opioid with an analgesic effect in the postoperative pain management comparable to morphine. Oxycodone is N-demethylated by CYP2D6 to its active metabolite oxymorphone, a potent μ-receptor agonist. A genetic polymorphism divides a Caucasian population into two groups: 8% with an enzyme lacking activity, poor metabolizers (PM) and the rest with normal CYP2D6 activity, extensive metabolizers (EM).

Many different, single nucleotide polymorphisms (SNPs) are responsible for interindividual differences in the effect of opioids. Among these are the A118G SNP in the μ-receptor gene OPRM1 and the C3435T and G2677T/A SNPs in the MDR-1 gene of P-glycoprotein. P-glycoprotein is responsible for the absorption, excretion and transport of many drugs including opioids over the blood-brain barrier.

Electrical stimulation and cold pressor test are among the most well defined and evaluated human experimental pain models. The 32 volunteers will be submitted to the tests before and 1, 2, 3 and 4 hours after medicine intake.

To determine the plasma levels of Oxycodone and its metabolites blood will be drawn after each pain test. Also the CYP2D6 genotype and the above mentioned SNPs will be determined from the blood samples.


Ages Eligible for Study:   20 Years to 40 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy volunteer age between 20 and 40 years.
  • Healthy according to medical history and physical examination.
  • Informed consent given.
  • Phenotyped or genotyped as extensive or poor metabolizer of sparteine.
  • Female: Use of safe contraception (IUD, gestagen injectiones or oral contraceptive) or negative u-HCG test.

Exclusion Criteria:

  • Any known allergy or intolerance to oxycodone.
  • Regularly drug therapy or medication (except contraceptives).
  • Alcohol or medicine abuse.
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Please refer to this study by its identifier: NCT00271973

University of Southern Denmark, IST Clinical Pharmacology
Odense, Odense C, Denmark, 5000
Sponsors and Collaborators
Odense University Hospital
Principal Investigator: Stine T. Zwisler, Dr. University of Southern Denmark
  More Information Identifier: NCT00271973     History of Changes
Other Study ID Numbers: EudraCT 2005-004082-42
Study First Received: January 3, 2006
Last Updated: January 29, 2007

Additional relevant MeSH terms:
Analgesics, Opioid
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents processed this record on April 28, 2017