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Bioequivalence Study of Dutasteride Five 0.1 mg and One 0.5 mg Soft Gelatin Capsules in Healthy Male Volunteers

Information source: GlaxoSmithKline
ClinicalTrials.gov processed this data on August 20, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Alopecia

Intervention: GI198745 0.1 mg (Drug); GI198745 0.5 mg (Drug)

Phase: Phase 1

Status: Completed

Sponsored by: GlaxoSmithKline

Official(s) and/or principal investigator(s):
GSK Clinical Trials, Study Director, Affiliation: GlaxoSmithKline


The aim of this study is to determine the bioequivalence of 5 x 0. 1 milligram (mg) capsules compared to 1 x 0. 5 mg capsule of dutasteride in healthy male subjects. The results of this study are expected to support registration applications for androgenetic alopecia (AGA) in Japan and other international markets.

Clinical Details

Official title: An Evaluation of the Bioequivalence of Five 0.1 mg GI198745/Dutasteride Soft Gelatin Capsules Compared to One 0.5 mg GI198745/Dutasteride Gelatin Capsules in Healthy Male Volunteers

Study design: Allocation: Randomized, Endpoint Classification: Bio-equivalence Study, Intervention Model: Crossover Assignment, Masking: Open Label

Primary outcome: Serum pharmacokinetic (PK) parameters: maximum observed concentration (Cmax) and Area under the concentration-time curve from time zero to last time of quantifiable concentration within a subject (AUC[0-t]) for dutasteride

Secondary outcome:

Time to Cmax (tmax) for dutasteride as data permit

Safety and tolerability of all treatments as assessed by vital signs, electrocardiogram (ECG) measurements, review of adverse events (AEs) and clinical laboratory safety data


Minimum age: 18 Years. Maximum age: 65 Years. Gender(s): Male.


Inclusion Criteria:

- Males aged between 18 and 65 years of age inclusive, at the time of signing the

informed consent.

- Healthy as determined by a responsible and experienced physician, based on a medical

evaluation including medical history, physical examination, laboratory tests and cardiac monitoring. A subject with a clinical abnormality or laboratory parameter(s) which is/are not specifically listed in the inclusion or exclusion criteria, outside the reference range for the population being studied may be included only if the Investigator, in consultation with the GlaxoSmithKline (GSK) Medical Monitor if required, judges and documents that the finding is unlikely to introduce additional risk factors and will not interfere with the study procedures.

- Body weight >= 50 kilogram (kg) and body mass index within the range 19 - 32

kg/square meter (m2) (inclusive).

- Male subjects with female partners of child-bearing potential must agree to use a

condom. This criterion must be followed from the time of the first dose of study medication until 50 days post last dose.

- Willing and able to give written informed consent, which includes compliance with all

the requirements and restrictions listed in the consent form for the full duration of the study, and able to understand and follow instructions related to study procedures.

- Able to swallow and retain oral medication.

- Alanine aminotransferase, Aspartate aminotransferase, alkaline phosphatase and

bilirubin <= 2. 0 x upper limit of normal (ULN) (isolated bilirubin >1. 5xULN is acceptable if bilirubin is fractionated and direct bilirubin <35%).

- Based on single or averaged corrected QT interval (QTc) values of triplicate ECGs

obtained over a brief recording period: QT duration corrected for heart rate by Fridericia's formula (QTcF) < 450 milliseconds. Exclusion Criteria:

- Current or chronic history of liver disease, or known hepatic or biliary

abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).

- History of regular alcohol consumption within 6 months of the study defined as:

An average weekly intake of >21 units for males. In Australia one unit (=standard drink) is equivalent to 10 gram of alcohol: 270 milliliter (mL) of full strength beer (4. 8%), 375 mL of mid strength beer (3. 5%), 470 mL of light beer (2. 7%), 250mL pre-mix full strength spirit (5%), 100 mL of wine (13. 5%) and 30 mL of spirit (40%).

- History of sensitivity to any of the study medications, or components thereof or a

history of drug, or other allergy that, in the opinion of the investigator or GSK Medical Monitor, contraindicates their participation.

- History of myocardial infarction, coronary bypass surgery, unstable angina, cardiac

arrhythmias, clinically evident congestive heart failure, or cerebrovascular accident prior to Screening visit;

- History of diabetes or peptic ulcer disease which is uncontrolled by medical


- History of: Breast cancer or clinical breast examination finding suggestive of

malignancy; Malignancy within the past five years, except for basal cell carcinoma of the skin. Subjects with a prior malignancy who have had no evidence of disease for at least the past 5 years are eligible.

- Prior medical history or evidence of prostate cancer (e. g., positive biopsy, or

suspicious ultrasound, or suspicious digital rectal examination [DRE]). Patients with suspicious ultrasound or DRE who have had a negative biopsy within the preceding 6 months and stable prostate specific antigen (PSA) are eligible for the study.

- A positive pre-study Hepatitis B surface antigen or positive Hepatitis C antibody

result within 3 months of screening

- A positive pre-study drug/alcohol screen.

- A positive test for HIV antibody.

- Creatinine >1. 5xULN normal

- Where participation in the study would result in donation of blood or blood products

in excess of 500 mL within a 56 day period.

- The subject has participated in a clinical trial and has received an investigational

product within the following time period prior to the first dosing day in the current study: 30 days, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer).

- Exposure to more than four new chemical entities within 12 months prior to the first

dosing day.

- Unable to refrain from the use of prescription or non-prescription drugs, including

vitamins, herbal and dietary supplements (including St John's Wort) within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) prior to the first dose of study medication, unless in the opinion of the Investigator and GSK Medical Monitor the medication will not interfere with the study procedures or compromise subject safety.

Locations and Contacts

GSK Investigational Site, Randwick, New South Wales 2031, Australia
Additional Information

Starting date: September 2013
Last updated: February 6, 2014

Page last updated: August 20, 2015

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