Paracetamol and Pharmacogenetic

May 13, 2013 updated by: University Hospital, Clermont-Ferrand

Paracétamol and Pharmacogenetic in Healthy Volunteers

Recent works has emphasized that the mechanism of action of paracetamol analgesic depend on its metabolism in the body, since a breakdown product of paracetamol, the AM404 is now considered the analgesic metabolite of paracetamol suggesting as paracetamol may be a pro-drug.

Indeed, it has been shown that paracetamol may have a deleterious effect, especially in vulnerable populations (hepatic insufficiency, elderly). First results showed a very significant decrease in sulfatation and gluthatione and increased phase 1 metabolism of acetaminophen, which involves enzymes such as cytochrome P450.

Multifactorial causes, combining nutrition (depletion of sulfur amino acids), increased detoxification of toxic metabolites of paracetamol, stress or trauma are discussed to explain the results.

Clinical studies showed a great variability of pain assessment by patients and variability in the metabolic response of paracetamol. Genetic factors probably play a role remains largely unknown.

The review of the literature on genetic polymorphism shows the involvement of a number of enzymes that are well known, predominantly on the metabolism of acetaminophen liver, but without connection with its analgesic effect. This is a critical missing link in the understanding of the analgesic effect of paracetamol.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Randomized, single-center, placebo-controlled, double-blind, cross-over in 100 healthy volunteers meeting the inclusion criteria and receiving 2g of paracetamol orally or placebo on two study periods separated by one week.

The evaluation criterion is the difference in areas under the curve of pain thresholds to thermal and mechanical stimulations test

Study Type

Interventional

Enrollment (Actual)

100

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • France
      • Clermont-Ferrand, France, 63003
        • CHU Clermont-Ferrand

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 30 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Male

Description

Inclusion Criteria:

  • Healthy volunteers
  • Males
  • Aged between 18 and 30 years

Exclusion Criteria:

  • Subject without cons-indications of paracetamol

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Interventional Model: Crossover Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Paracetamol
Drug: Paracetamol (drug)
Randomized, single-center, placebo-controlled, double-blind, cross-over in 100 healthy volunteers meeting the inclusion criteria and receiving 2g of paracetamol orally or placebo on two study periods separated by one week.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Correlation between Pharmacogenetic profile and pain threshold
Time Frame: until 14 days before the administration
until 14 days before the administration

Secondary Outcome Measures

Outcome Measure
Time Frame
Measures of thermal and mechanical pain thresholds
Time Frame: until 1 hour before the administration
until 1 hour before the administration
Determination of blood concentration of gluthatione
Time Frame: until 1 hour before administration
until 1 hour before administration

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University Hospital, Clermont-Ferrand

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

November 1, 2011

Primary Completion (Actual)

May 1, 2013

Study Completion (Actual)

May 1, 2013

Study Registration Dates

First Submitted

August 30, 2011

First Submitted That Met QC Criteria

January 26, 2012

First Posted (Estimate)

January 30, 2012

Study Record Updates

Last Update Posted (Estimate)

May 14, 2013

Last Update Submitted That Met QC Criteria

May 13, 2013

Last Verified

May 1, 2013

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CHU-0101

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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