This site became the new on June 19th. Learn more.
Show more Menu IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu IMPORTANT: Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu
Give us feedback

The Effect Of Fesoterodine On Pharmacokinetics And Pharmacodynamics Of Warfarin In Healthy Subjects

This study has been completed.
Information provided by:
Pfizer Identifier:
First received: June 3, 2009
Last updated: May 31, 2011
Last verified: May 2011
This is an open-label, randomized, two-way crossover study to evaluate the steady-state effect of fesoterodine (8 mg QD) on the pharmacodynamics and pharmacokinetics of a single supratherapeutic dose of warfarin (25 mg) in healthy subjects.

Condition Intervention Phase
Urinary Bladder, Overactive Drug: warfarin Drug: Warfarin plus Fesoterodine Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: An Open-Label, Randomized, Two-Way Crossover Study To Evaluate The Steady-State Effect Of Fesoterodine On The Pharmacokinetics And Pharmacodynamics Of A Single Supratherapeutic Dose Of Warfarin In Healthy Subjects.

Resource links provided by NLM:

Further study details as provided by Pfizer:

Primary Outcome Measures:
  • Cmax and AUCinf for both S- and R-warfarin [ Time Frame: 8 days per period ]
  • AUC_INR and INRmax [ Time Frame: 8 days per period ]

Secondary Outcome Measures:
  • AUClast, Tmax and t½ for both S- and R-warfarin [ Time Frame: 8 days per period ]
  • AUC_PT and PTmax [ Time Frame: 8 days per period ]
  • Safety will be assessed by subjective symptoms/objective findings including physical examinations, clinical safety laboratory assessments, 12-lead ECGs, vital sign measurements and adverse event monitoring. [ Time Frame: 8 days per period ]

Estimated Enrollment: 14
Study Start Date: July 2009
Study Completion Date: August 2009
Primary Completion Date: August 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Warfarin Alone
Reference treatment
Drug: warfarin
Single Dose Warfarin 25 mg on Day 1
Experimental: Warfarin Concomitantly With Fesoterodine
Test treatment
Drug: Warfarin plus Fesoterodine
Fesoterodine 8 mg ER tablets QD for 9 Days and Single Dose Warfarin 25 mg on Day 3


Ages Eligible for Study:   18 Years to 55 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy male and/or female subjects between the ages of 18 and 55 years

Exclusion Criteria:

  • Not healthy subjects--subjects with acute or chronic medical or psychiatric conditions or laboratory abnormality
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00914667

United States, Connecticut
Pfizer Investigational Site
New Haven, Connecticut, United States, 06511
Sponsors and Collaborators
Study Director: Pfizer Call Center Pfizer
  More Information

Additional Information:
Responsible Party: Director, Clinical Trial Disclosure Group, Pfizer, Inc. Identifier: NCT00914667     History of Changes
Other Study ID Numbers: A0221079
Study First Received: June 3, 2009
Last Updated: May 31, 2011

Keywords provided by Pfizer:
Overactive Bladder Urgency Frequency

Additional relevant MeSH terms:
Urinary Bladder, Overactive
Urinary Bladder Diseases
Urologic Diseases
Lower Urinary Tract Symptoms
Urological Manifestations
Signs and Symptoms
Muscarinic Antagonists
Cholinergic Antagonists
Cholinergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs
Urological Agents processed this record on August 22, 2017