A Study to Evaluate the Pharmacokinetics, Safety and Tolerability of Retosiban (GSK221149) When Dosed With Efavirenz (EFZ)
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|ClinicalTrials.gov Identifier: NCT01867996|
Recruitment Status : Completed
First Posted : June 4, 2013
Last Update Posted : May 11, 2017
|Condition or disease||Intervention/treatment||Phase|
|Obstetric Labour, Premature||Drug: Retosiban Drug: EFZ 600 mg||Phase 1|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||18 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||To Evaluate the Pharmacokinetics, Safety and Tolerability of Retosiban (GSK221149) Co-administered With EFAVIRENZ|
|Actual Study Start Date :||June 11, 2013|
|Actual Primary Completion Date :||September 26, 2013|
|Actual Study Completion Date :||September 26, 2013|
Experimental: Retosiban and EFZ
All subjects will receive on Day 1, a 6 mg bolus of retosiban for 5 min, followed by a 6 mg/hr infusion for 12 hrs. On Day 2 a washout day will occur. On Days 3-17, subjects will receive EFZ 600 mg OD dose of in the evening. On Day 18, subjects will receive a 6 mg bolus of retosiban for 5 mins, followed by a 6 mg/hr infusion for 12 hrs plus a 600 mg dose of EFZ.
Retosiban will be supplied as clear colorless solution for infusion (300 mg in 20 mL via). Subject will receive loading dose of 6 mg over 5 min infusion followed by 6 mg/hour infusion for 12 hrs on Day 1 and Day 18.Drug: EFZ 600 mg
EZF 600 mg will be supplied as a yellow, capsular-shaped, film-coated tablet. Subjects will receive EFZ 600mg OD in the evening from Day 3 till Day 18.
- Plasma GSK221149 (parent) and GSK2847065 (metabolite) PK parameters of AUC, Cmax and CL. [ Time Frame: 0, 0.25, 0.5, 0.75, 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, and 24 hours (hrs) after the start of the infusion on Day 1 and Day 18. ]The following PK parameters will be determined after administration of GSK221149 with and without EFZ 600 mg: Area under the plasma concentration-time curve (AUC)- from time zero to time t [AUC(0-t)] and from time zero extrapolated to infinite time [AUC(0-infinity)], maximum observed plasma concentration (Cmax) and clearance (CL). CL will be calculated for parent only.
- Safety and tolerability of administration of GSK221149 with and without EFZ 600 mg as assessed by adverse event, concurrent medication review, clinical laboratory tests, ECG, and vital signs measurements. [ Time Frame: Up to 8 Weeks ]Clinical laboratory tests will include hematology, clinical chemistry and urinalysis parameters. Triplicate 12-lead ECGs will be obtained at the screening visit. Single 12-lead ECGs will be obtained at other time points during the study. Vital sign measurements will include systolic and diastolic blood pressure and pulse rate.
- Plasma GSK221149 and GSK2847065 PK parameters of tmax, tlag and t1/2. [ Time Frame: 0, 0.25, 0.5, 0.75, 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, and 24 hours (hrs) after the start of the infusion on Day 1 and Day 18. ]The following PK parameters will be determined after administration of GSK221149 with and without EFZ 600 mg: time to Cmax (tmax), lag time (tlag), and terminal phase half-life (t1/2). The terminal half-life (t1/2) is defined as the time required for the plasma concentration of drug to reach half of its original concentration.
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): NCT01867996
|United States, Maryland|
|GSK Investigational Site|
|Baltimore, Maryland, United States, 21225|
|Study Director:||GSK Clinical Trials||GlaxoSmithKline|