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Pharmacokinetics of Fentanyl Following Intravenous and Oral Routes of Administration in Healthy Volunteers

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ClinicalTrials.gov Identifier: NCT00714558
Recruitment Status : Completed
First Posted : July 14, 2008
Last Update Posted : May 19, 2011
Information provided by:
Alza Corporation, DE, USA

Brief Summary:
The purpose of the study is to compare the pharmacokinetics of fentanyl following i.v. and oral administration in healthy volunteers, and to assess the bioavailability of fentanyl following oral administration. Moreover, safety is assessed.

Condition or disease Intervention/treatment Phase
Biological Availability Drug: Fentanyl citrate; Naltrexone; Naloxone Phase 1

Detailed Description:

Fentanyl, is an opioid (morphine-like) drug, that has been demonstrated to be an effective pain-killer medication by the i.v. and transdermal (through skin) routes. Fentanyl is used just before, during, and after surgery for its sedative and pain-relieving actions. In addition, fentanyl is currently marketed for transdermal use (Duragesic fentanyl transdermal patch) for the management of chronic pain. The information on the bioavailability of fentanyl solution, following the oral route of administration, is sparse. This is a single-center, randomized (study drug assigned by chance), open-label, 2-treatment, 2-period, crossover study. Healthy volunteers were randomly assigned to 1 of the 2 treatment sequences (AB or BA) with a washout period of 6 to 14 days between treatments. The washout period commenced the day of dosing, after drug administration. Prior to the first treatment period, each healthy volunteer was challenged with naloxone to ensure that he/she was not dependent on morphine-like drugs. A negative naloxone challenge test was required for the healthy volunteer to be eligible for participation in the study. Each healthy volunteer received a 50 mg naltrexone tablet starting 14 hours before dosing and then twice daily ending 24 hours after dosing to block the fentanyl effects. Blood samples were collected, from the arm opposite to the 1 selected for fentanyl i.v administration, for determination of blood fentanyl levels at the scheduled time points. Pulse, blood pressure, breathing rate, body temperature were recorded to monitor the safety. The healthy volunteers were monitored for respiratory depression every 30 minutes during sleep periods. The healthy volunteers remained in the clinic throughout the blood sample collection periods, and were monitored for adverse events throughout the study.

Treatment A: 300 mcg fentanyl citrate administered i.v. over 15 minutes. The 300 mcg (6 mL) i.v. solution was diluted and infused at a rate of 1 mL/minute. Treatment B: 1 mg fentanyl citrate solution administered orally. One mg fentanyl citrate was ingested in 20 mL solution; Naltrexone (50 mg) was administered orally to each healthy volunteer in both periods starting 14 hours before dosing, and twice daily through 24 hours post-dose.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 18 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Pharmacokinetics of Fentanyl Citrate Following Intravenous (i.v.) and Oral Routes of Administration in Healthy Subjects
Study Start Date : April 2003
Study Completion Date : May 2003

Resource links provided by the National Library of Medicine

U.S. FDA Resources

Primary Outcome Measures :
  1. Evaluate the pharmacokinetics of fentanyl citrate following i.v. and oral routes of administration in healthy volunteers, and to assess the absolute bioavailability of fentanyl citrate following oral administration.

Secondary Outcome Measures :
  1. Assessment of safety. Vital signs, Physical examination, clinical laboratory tests, and electrocardiogram were performed at screening and study termination. Additionally, vital signs were recorded on Days 1 and 2 of both treatment periods.

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy, non smoker, men and nonpregnant nonlactating women
  • Weighing a minimum of 60 kg and were within 15% of ideal weight for height as described in the Metropolitan Life Insurance Height and Weight Standards
  • Who did not have a history or show presence of drug or alcohol dependence or abuse
  • And who had, after sitting for 5 minutes, blood pressure between the ranges of 100 to 150 mm Hg systolic and 50 to 90 mm Hg diastolic. Any decrease in systolic blood pressure after standing for 2 minutes had to be less than or equal to 20 mm Hg

Exclusion Criteria:

  • History of chronic obstructive pulmonary disease or any other lung disease, such as asthma, that would cause carbon dioxide retention
  • Known allergy or hypersensitivity to fentanyl or other opioids, naltrexone or naloxone
  • Usage of prescription medication (except for birth control medications, sex-hormone replacement or vitamins) within 14 days before Day 1, monoamine oxide inhibitors within 21 days prior to Day 1, over-the-counter medication (except for vitamin supplements or acetaminophen less than 2 gm/day) or herbal medication within 3 days prior to Day 1, alcohol, grapefruit juice, or caffeine within 48 hours before dosing
  • Consumption of more than 450 mg of caffeine per day (eg, approximately 5 cups of tea, 3 cups of regular coffee, or 8 cans of cola)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00714558

Sponsors and Collaborators
Alza Corporation, DE, USA
Study Director: Alza Corporation Clinical Trial Alza Corporation, DE, USA

Additional Information:
ClinicalTrials.gov Identifier: NCT00714558     History of Changes
Other Study ID Numbers: CR003253
First Posted: July 14, 2008    Key Record Dates
Last Update Posted: May 19, 2011
Last Verified: April 2010

Keywords provided by Alza Corporation, DE, USA:
Administration, Oral
Biological Availability
Infusions, Intravenous

Additional relevant MeSH terms:
Citric Acid
Analgesics, Opioid
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Adjuvants, Anesthesia
Anesthetics, Intravenous
Anesthetics, General
Calcium Chelating Agents
Chelating Agents
Sequestering Agents
Molecular Mechanisms of Pharmacological Action
Narcotic Antagonists