In-situ Intestinal Absorption and Pharmacokinetic Investigations of Carvedilol Loaded Supersaturated Self-emulsifying Drug System

Author(s): Vamshi M. Krishna, Vijaya B. Kumar, Narendar Dudhipala*

Journal Name: Pharmaceutical Nanotechnology

Volume 8 , Issue 3 , 2020

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Graphical Abstract:


Abstract:

Background: Carvedilol (CD), a non-selective beta-blocker, is indicated for the management of mild to moderate congestive heart failure. After oral administration, CD is rapidly absorbed with an absolute bioavailability of 18-25% because of low solubility and extensive first-pass metabolism.

Objective: The present investigation focused on enhanced oral delivery of CD using supersaturated self-emulsifying drug delivery (SEDDS) system.

Methods: Optimized SEDDS consisted of a blend of Oleic acid and Labrafil-M2125 as an oil-phase, Cremophor-RH40, polyethylene glycol-400 and HPMC-E5 as a surfactant, co-surfactant and supersaturation promoter respectively. Formulations were characterized for physical characteristics, invitro release in simulated and biorelevant dissolution media, intestinal permeability and bioavailability studies in Wistar rats. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) studies were used to confirm the crystalline nature and shape of the optimized formulation.

Results: DSC and XRD, SEM studies showed that the drug was in amorphous form, and droplets were spherical in shape. Dissolution studies clearly showed distinct CD release in compendial and biorelevant dissolution media. The results from permeability and in-vivo studies depicted 2.2-folds and 3.2-folds increase in permeability and bioavailability, respectively from supersaturated SEDDS in comparison with control.

Conclusion: The results conclusively confirmed that the SEDDS formulation could be considered as a new alternative delivery vehicle for the oral supply of CD.

Lay Summary: Carvedilol (CD) is a non-selective antihypertensive drug with poor oral bioavailability. Previously, various lipid delivery systems were reported with enhanced oral delivery. We developed suprsaturable SEDDS formulation with immediate onset of action. SEDDS formulation was developed and optimized as per the established protocols. The optimized SEDDS formulation was stable over three months and converted to solid and supersaturated SEDDS. The results from permeability and in-vivo studies demonstrated an enhancement in permeability and bioavailability from supersaturated SEDDS in comparison with control. The results conclusively confirmed that the SEDDS formulation could be considered as a new alternative delivery vehicle for the oral administration of CD.

Keywords: Bioavailability, biorelevant media, carvedilol, intestinal permeability, SEDDS, super saturation promoter.

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VOLUME: 8
ISSUE: 3
Year: 2020
Published on: 30 September, 2020
Page: [207 - 224]
Pages: 18
DOI: 10.2174/2211738508666200517121637
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