Pharmacodynamic Drug Interaction Between Warfarin and Amoxicillin-clavulanic Acid

NCT ID: NCT00603317

Last Updated: 2010-07-12

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

PHASE4

Total Enrollment

13 participants

Study Classification

INTERVENTIONAL

Study Start Date

2008-03-31

Study Completion Date

2010-03-31

Brief Summary

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Several case reports indicate that the use of the antibiotic combination amoxicillin and clavulanic acid (AM-CLAVAC) can interact with warfarin pharmacodynamics. However, fever per se might also be responsible of these warfarin overdose reports, as well as the use of high dose paracetamol.

The aim of the present study is to determine if AM-CLAVAC can increase the pharmacodynamics of warfarin among patients at steady state Double blinded cross over controlled study vs placebo performed in 12 evaluable patients treated with warfarin with an INR target 2 to 3 and a stable INR and a stable dose.

Detailed Description

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Double blinded cross over controlled study vs placebo performed in 12 evaluable patients treated with warfarin with an INR target 2 to 3 and a stable INR and a stable dose

One period : seven consecutive days of amoxicillin(2g twice daily)- clavulanic acid (125 mg twice daily) association Wash out period of at least 4 weak with the return to a stable INR and warfarin dose One period : seven consecutive days of placebo twice daily

Main outcome INR delta Day7-Day

Conditions

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Oral Anticoagulation Deep Venous Thrombosis Atrial Fibrillation Pulmonary Embolism

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

TREATMENT

Blinding Strategy

QUADRUPLE

Participants Caregivers Investigators Outcome Assessors

Study Groups

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1

Order 1 : Firstly Amoxicillin-Acid clavulanic, and Secondly Placebo

Group Type EXPERIMENTAL

Firstly : Amoxicillin-Clavulanic acid and secondly : Placebo

Intervention Type DRUG

Amoxicillin : 2g twice daily Clavulanic acid : 125 mg twice daily

2

Order 2 : Firstly Placebo, and Secondly Amoxicillin-Acid clavulanic

Group Type EXPERIMENTAL

Firstly : Placebo and secondly : Amoxicillin-Clavulanic acid

Intervention Type DRUG

Amoxicillin : 2g twice daily Clavulanic acid : 125mg twice daily seven consecutive days

Interventions

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Firstly : Amoxicillin-Clavulanic acid and secondly : Placebo

Amoxicillin : 2g twice daily Clavulanic acid : 125 mg twice daily

Intervention Type DRUG

Firstly : Placebo and secondly : Amoxicillin-Clavulanic acid

Amoxicillin : 2g twice daily Clavulanic acid : 125mg twice daily seven consecutive days

Intervention Type DRUG

Eligibility Criteria

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Inclusion Criteria

* patients treated with warfarin (target INR 2 to 3)
* stable anticoagulation (3 consecutive INR in the target)
* stable dose
* no infection
* normal CRP
* age \>18 years
* normal transaminase levels

Exclusion Criteria

* drug allergy
* penicillin allergy
* Alzheimer
* cancer
* thyroid disease
* gastro intestinal chronic disease
* frequent nausea or vomiting
* Cirrhosis
* chronic renal failure (GFR\<60 ml/min)
* frequent intake of paracetamol or NSAID
* addict to drugs or alcool
* St John's wort treatment or grapefruit juice intake
* concomitant drugs (amiodarone, cimetidine, SSRI, clofibrate, fenofibrate, diltiazem, fluconazole, itraconazole, isoniazide, voriconazole, métronidazole, miconazole , omeprazole, glucocorticoids, zileuton, ritonavir, rifampicin, carbamazepine, phenytoin, phenobarbital)
* antibiotic use during the 3 last weeks
* pregnancy
Minimum Eligible Age

18 Years

Maximum Eligible Age

80 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Assistance Publique - Hôpitaux de Paris

OTHER

Sponsor Role lead

Responsible Party

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Department Clinical Reseach of Developpement

Principal Investigators

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Stephane MD MOULY, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

Assistance Publique - Hôpitaux de Paris

Locations

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Hopital Lariboisière - Service de médecine interne

Paris, , France

Site Status

Countries

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France

Other Identifiers

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P051056

Identifier Type: -

Identifier Source: org_study_id

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