Crossover Study to Evaluate the Comparative Bioavailability of Two Fixed Dose Combination Tablet Formulations of Extended Release Metformin and Extended Release Glimepiride in Health Volunteers

This is a an open-label, randomized, single dose, four-way crossover, multi-stage study enrolling 20 healthy adult male and female subjects per part. This study consists of two separate parts (Part A and B) with each part comprising four treatment periods. Each subject will participate in all four treatment periods per part; Subjects may not enrol in both Parts A and B.

This study is being conducted to compare the pharmacokinetics (PK) of two extended release fixed dose combinations (FDC) oral formulations of metformin and glimepiride at two doses, 500mg/1mg and 1000mg/2mg, with each FDC formulation to be administered orally as a single dose and compared with the commercially available formulations of metformin extended release (XR) (GLUCOPHAGE ™ Sustained Release \[SR\]) and glimepiride immediate release (IR) (AMARYL ™).

Part A of study will evaluate the bioavailability of a formulation comprising a film coated tablet containing release controlling polymers; and Part B will evaluate the bioavailability of a formulation comprising a tablet coated with release controlling polymers.

In each part there will be 4 treatment periods. During each period, subjects will be randomized sequentially to receive a single dose of a reference treatment of 500 mg metformin XR / 1 mg glimepiride IR; and a reference treatment of 1000 mg metformin XR / 2 mg glimepiride IR; and an FDC tablet containing 500 mg metformin XR and 1 mg glimepiride XR; and an FDC tablet containing 1000 mg metformin XR and 2 mg glimepiride XR.Serial PK sampling for up to 36 hours and safety assessments will be performed. Each period will be separated by a washout period of at least 5 days and a follow-up visit will occur 14 days after the last dose of study drug.


Eligibility Criteria:
Inclusion Criteria:

* Healthy male or female subjects between 18 and 65 years of age inclusive with body weight \>= 50 kg and body mass index (BMI) within the range 19 to 32 kilogram/meter squared
* Alanine aminotransferase (ALT) alkaline phosphatase and bilirubin \<or=1.5x upper limit of normal (ULN).
* Normal ECG measurements. Average QT duration corrected for heart rate by Fridericia's formula (QTcF) \<450 millisecond or QTcF \<480 msec in subjects with Bundle Branch Block based on an average from three electrocardiograms (ECGs) obtained over a brief recording period.
* Female subjects of non-child bearing potential. Females of child bearing potential are eligible to enter if they are not pregnant and willing to use protocol-specified methods of contraception to prevent pregnancy until 14 days post-last dose of metformin/glimepiride.
* Capable of giving written informed consent

Exclusion Criteria:

* The subject has a positive: drug/alcohol screen, Hepatitis, HIV screen
* Abuse of alcohol
* Current or chronic history of liver disease, or known hepatic or biliary abnormalities
* Exposure to more than four new investigational chemical entities within 12 months prior to the first dosing day
* 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)
* 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
* Donation of more than 500 mL blood within a 56 day period
* Pregnant or lactating females
* Unwillingness or inability to follow the procedures outlined in the protocol
* Subject is mentally or legally incapacitated
* Subject having positive urinary cotinine levels indicative of use of tobacco or nicotine-containing products within 6 months prior to screening.
* Unable to refrain from consumption of red wine, Seville oranges, grapefruit or grapefruit juice from 7 days prior to the first dose
* Subjects having asthma or are positive carbon monoxide (CO) on admission to the Unit
* Unable to refrain from the use of prescription or non-prescription drugs within 7 days prior to first dose of study medication, unless approved by the Investigator and GSK Medical Monitor.