Hot melt granulation: a facile approach for monolithic osmotic release tablets

Area of Science:

• Pharmaceutical Technology
• Drug Delivery Systems
• Oral Hypoglycemic Agents

Background:

• Glipizide (GP) is an oral hypoglycemic agent requiring effective extended-release formulations.
• Developing stable and efficient extended-release matrix tablets is crucial for managing diabetes.
• Existing formulations may have limitations in release control and stability.

Purpose of the Study:

• To develop and evaluate an extended-release matrix tablet of glipizide (GP).
• To investigate the influence of formulation excipients on glipizide release kinetics.
• To assess the stability and in vitro performance of the optimized glipizide formulation.

Main Methods:

• Preparation of glipizide matrix tablets using microcrystalline cellulose, sodium chloride, and polyethylene glycol.
• Incorporation of Kollidon SR, hydroxypropyl methylcellulose, polyethylene oxide, and/or magnesium hydroxide.
• Hot melt granulation technique for matrix preparation and cellulose acetate/polyethylene glycol coating.
• Scanning electron microscopy (SEM) for surface texture analysis and in vitro release studies.

Main Results:

• Glipizide release was significantly influenced by sodium chloride and magnesium hydroxide content.
• The optimized formulation containing polyethylene oxide, sodium chloride, and magnesium hydroxide showed enhanced hydration and swelling.
• SEM confirmed pore formation in the semi-permeable coating membrane, facilitating drug release.
• The optimized formulation exhibited a release profile similar to a marketed extended-release tablet (f2 = 74.7).

Conclusions:

• An optimized extended-release glipizide matrix tablet was successfully developed.
• The formulation demonstrated favorable in vitro release characteristics and stability under ICH guidelines.
• This extended-release glipizide formulation holds promise for improved glycemic control in diabetic patients.