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ISSN: 0975-0851

Journal of Bioequivalence & Bioavailability
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Research Article

Metformin IR versus XR Pharmacokinetics in Humans

Nasir Idkaidek1*, Tawfiq Arafat1, Munther Melhim2, Jaafar Alawneh2 and Nancy Hakooz3

1University of Petra, Amman, Jordan

2Jordan Center for Pharmaceutical Research (JCPR), Amman, Jordan

3University of Jordan, Amman, Jordan

*Corresponding Author:
Dr. Nasir Idkaidek
University of Petra, Pharmacy College
PO Box 961343, Amman, Jordan
Tel: 96265715553
Fax: 96265715570
E-mail: [email protected]

Received Date: September 15, 2011; Accepted Date: November 02, 2011; Published Date: November 04, 2011

Citation: Idkaidek N, Arafat T, Melhim M, Alawneh J, Hakooz N (2011) Metformin IR versus XR Pharmacokinetics in Humans. J Bioequiv Availab 3: 233-235. doi: 10.4172/jbb.1000092

Copyright: © 2011 Idkaidek N, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Pharmacokinetics of metformin extended release (XR) formulation were studied under fasting and fed conditions and compared to those of immediate release (IR) under fasting conditions in humans. 78 healthy human volunteers participated in 3 independent studies (26 subjects per study) were given either 1000 mg oral dose metformin IR or 750 mg metformin XR. Plasma samples were obtained up to 24 hours after dosing. Pharmacokinetic parameters in plasma were calculated by non compartmental analysis using Kinetica program. Results have shown increased XR bioavailability and delayed time to reach the maximum concentration (Cmax ) in the fed state as compared to fasted state, with no significant difference in Cmax and half life values. On the other hand, the IR formulation showed significant differences in all parameters as compared to XR formulation, yet the half life was similar. In conclusion, XR formulation was shown similar to IR formulation with less possible side effects.

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