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

This study has been completed.
Information provided by:
Alza Corporation, DE, USA Identifier:
First received: July 10, 2008
Last updated: May 18, 2011
Last verified: April 2010
The purpose of the study is to compare the pharmacokinetics of naltrexone following i.v. and oral administration in healthy volunteers, and to assess the bioavailability of naltrexone following oral administration. Moreover, safety is assessed.

Condition Intervention Phase
Biological Availability Drug: Naltrexone HCl. Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Pharmacokinetics of Naltrexone Hydrochloride (HCl) Following Intravenous (i.v.) and Oral Routes of Administration in Healthy Subjects

Resource links provided by NLM:

Further study details as provided by Alza Corporation, DE, USA:

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

Secondary Outcome Measures:
  • 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.

Enrollment: 18
Study Start Date: May 2003
Study Completion Date: June 2003
Detailed Description:

Naltrexone blocks the effects of opioid (morphine-like) drugs by competitive binding at the opioid receptors in the brain. Naltrexone does not possess morphine-like properties and exhibits minimal pharmacologic activity. Naltrexone is marketed as an oral tablet. A wide range of oral bioavailability values have been reported for naltrexone. The wide range in oral bioavailability of naltrexone appears to be due to differences in assay specificity and the method of estimation of bioavailability (use of total drug, free drug, or urinary excretion data rather than plasma level). This was a single-center, randomized (study drug assigned by chance), open-label, 2-treatment, 2-period crossover study in healthy volunteers. Healthy volunteers were randomly assigned to 1 of 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. Blood samples for determination of blood naltrexone levels were collected at scheduled time points from the arm opposite to the 1 selected for naltrexone i.v. administration. Pulse, blood pressure, breathing rate, body temperature were measured at the times listed in the study schema. Healthy volunteers remained at the research facility for blood sample collection periods and were monitored for adverse events throughout the treatment periods.

Treatment A: 1 mg naltrexone HCl administered i.v. over 15 minutes (naltrexone i.v.). Treatment B: 50 mg naltrexone HCl administered orally (naltrexone oral).


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

Exclusion Criteria:

  • Known allergy or hypersensitivity to naltrexone
  • Usage of prescription medication including opioids (except for birth control medications, sex-hormone replacement, vitamins) within 14 days prior to Day 1, over-the-counter medication (except for vitamin supplements or acetaminophen [less than 2 g/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)
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Please refer to this study by its identifier: NCT00714584

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

Additional Information: Identifier: NCT00714584     History of Changes
Other Study ID Numbers: CR003256
Study First Received: July 10, 2008
Last Updated: May 18, 2011

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

Additional relevant MeSH terms:
Narcotic Antagonists
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents processed this record on September 19, 2017