Study of Tipranavir and Ritonavir on the Pharmacokinetic Characteristics of Methadone Administered in Healthy Volunteers

A Single-centre, Open-label Study of Multiple Doses of Tipranavir 500 mg and Ritonavir 200 mg (Twice Daily) on the Pharmacokinetic Characteristics of Methadone Administered as a Single Dose in Healthy Volunteers

The primary objective of this study is to characterise the effects of tipranavir 500 mg and ritonavir 200 mg (TPV/r; given twice daily) at steady-state on the pharmacokinetics of methadone administered as a single dose in healthy adult volunteers

Study Overview

• Status: Completed
• Conditions: Healthy
• Intervention / Treatment: Drug: Tipranavir; Drug: Ritonavir; Drug: Methadone

• Study Type: Interventional
• Enrollment (Actual): 15
• Phase: Phase 1

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 60 years (Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Male or female healthy volunteers aged at least 18 to 60 years.
• Clinically normal medical history.
• Clinically normal findings on physical examination.
• Clinically normal laboratory values.
• A Body Mass Index >18.5 and <30 kg/m2.
• Able to swallow large capsules without difficulty.
• Capable of comprehending and communicating effectively with the investigator and staff and of providing written informed consent in accordance with ethics committee and regulatory guidelines.
• Willing to stay in the study centre for the duration of the study.
• Willing to abstain from ingesting substances during the study which may alter plasma study drug levels by interaction with the cytochrome P450 system.
• Willing to abstain from alcohol for 48 hours prior to Visit 1 and for the duration of the study. In addition, Cabernet Sauvignon must not have been ingested within 15 days prior to Visit 1.
• Willing to abstain from ingesting grapefruit and grapefruit juice for 15 days before Visit 1 and for the duration of the study.
• Willing to abstain from ingesting Seville oranges, strawberries or strawberry extract, garlic supplements, St. John's Wort, Milk Thistle, or methylxanthine-containing drinks or food (coffee, tea, cola, energy drinks, chocolate, etc) for 72 hours before the pharmacokinetic sampling days.
• Willing to abstain from use of tobacco products for the duration of the study.
• Urine drug screen negative for illegal non-prescription drugs.
• Negative HIV serology.
• Negative for Hepatitis B surface antigen and Hepatitis C

Exclusion Criteria:

• Any clinically significant disease. (A significant disease was defined as a disease which in the opinion of the investigator may either have put the subject at risk because of participation in the study or a disease which may have influenced the results of the study or the subject's ability to participate in the study.)
• Clinically significant abnormal baseline haematology, blood chemistry or urinalysis findings.
• Serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), cholesterol, triglyceride or glucose greater than the upper limit of normal at Visit 1.
• Treatment with prohibited medications in the thirty days before the study or during the study or ingestion of drugs of abuse.
• Treatment with any investigational drug within 90 days of the first dose of study medication.
• Inability to adhere to the requirements of the protocol (including active substance abuse) as assessed by the investigator.
• Prior tipranavir use.
• Ingestion of any known enzyme altering drug (such as phenothiazines, cimetidine, barbiturates, ketoconazole, fluconazole, clarithromycin, rifampin, steroids, and herbal medications) for thirty days prior to Visit 1.
• Ingestion of grapefruit, grapefruit juice, and Cabernet Sauvignon within fifteen days prior to Visit 1.
• Ingestion of Seville oranges, strawberries or strawberry extract, garlic supplements, St. John's Wort, Milk Thistle, or methylxanthine-containing drinks or food (coffee, tea, cola, energy drinks, chocolate, etc) within 72 hours of pharmacokinetics sampling days.
• Treatment with prescription medicines within thirty days prior to Visit 1.
• History of gastrointestinal, hepatic, or renal disorders within 60 days prior to Visit 1.
• Any history of alcohol or drug abuse.
• Current use of cigarettes defined as greater than 10 cigarettes per day or rolling/pipe tobacco equivalent.
• Blood or plasma donations within 90 days prior to Visit 1
• Subjects with a seated systolic blood pressure either <100 mm Hg or >150 mm Hg; resting heart rate either <50 beats/min or >100 beats/min.
• Subjects with a history of any illness or allergy that, in the opinion of the investigator, might have confounded the results of the study or posed additional risk in administering tipranavir, ritonavir or methadone to the subject.
• Subjects who had an acute illness within two weeks prior to Visit 1.
• Subjects who were currently taking any over-the-counter drug within fourteen days prior to Visit 1 or who were currently taking any prescription drug.
• Hypersensitivity to tipranavir, ritonavir, or methadone.
• Female subjects who are of reproductive potential and who were pregnant, breastfeeding, had a positive serum B-HCG at Visit 1 or 2, had not been using a barrier contraceptive method for at least three months prior to Study Day 1 or were not willing to use a reliable method of double-barrier contraception (such as diaphragm with spermicidal cream/jelly or condoms with spermicidal foam) during the study and for thirty days after completion or termination of the study.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: TPV/r with methadone	Drug: Tipranavir; Drug: Ritonavir; Drug: Methadone

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Area under the concentration-time curve for 0 to 24 hours (AUC0-24h) of methadone	up to 24 hours after drug administration
Maximum concentration (Cmax)	up to 24 hours after drug administration
Concentration at 6 hours (C6h) of methadone	6 hours after drug administration
Area under the concentration-time curve for 0 to 12 hours (AUC0-12h) of tipranavir and ritonavir	up to 12 hours after drug administration
concentration at 12 hours (C12h) of tipranavir and ritonavir	12 hours after drug administration

Secondary Outcome Measures

Outcome Measure	Time Frame
mean residence time (MRT)	up to 24 hours after drug administration
apparent terminal half-life (t½)	up to 24 hours after drug administration
time to maximum concentration (Tmax)	up to 24 hours after drug administration
oral clearance (CL/F)	up to 24 hours after drug administration
apparent volume of distribution during the terminal elimination phase divided by the bioavailability factor (Vz/F)	up to 24 hours after drug administration
Number of patients with abnormal findings in physical examination	Up to day 17 after first drug administration
Number of patients with clinically significant changes in vital signs	Up to day 17 after first drug administration
Number of patients with abnormal changes in clinical laboratory parameters	Up to day 17 after first drug administration
Number of participants with adverse events	Up to day 17 after first drug administration

Collaborators and Investigators

• Sponsor: Boehringer Ingelheim

Publications and helpful links

Helpful Links

• Related Info

Study record dates

Study Major Dates

• Study Start: January 1, 2005
• Primary Completion (Actual): February 1, 2005

Study Registration Dates

• First Submitted: September 18, 2014
• First Submitted That Met QC Criteria: September 18, 2014
• First Posted (Estimate): September 19, 2014

Study Record Updates

• Last Update Posted (Estimate): September 19, 2014
• Last Update Submitted That Met QC Criteria: September 18, 2014
• Last Verified: September 1, 2014

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Anti-Infective Agents; Central Nervous System Depressants; Peripheral Nervous System Agents; Antiviral Agents; Enzyme Inhibitors; Anti-HIV Agents; Anti-Retroviral Agents; Analgesics; Sensory System Agents; Protease Inhibitors; Analgesics, Opioid; Narcotics; Cytochrome P-450 CYP3A Inhibitors; Cytochrome P-450 Enzyme Inhibitors; Respiratory System Agents; HIV Protease Inhibitors; Viral Protease Inhibitors; Antitussive Agents; Ritonavir; Tipranavir; Methadone
• Other Study ID Numbers: 1182.26