Studies on different dissolution models. IV. Erosion of tablets

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems

Background:

• Tablet erosion is a critical factor influencing drug release kinetics.
• Understanding erosion mechanisms is vital for optimizing oral dosage forms.

Purpose of the Study:

• To comparatively analyze the erosion of non-disintegrating theophylline tablets across various dissolution models.
• To investigate the relationship between tablet mechanical strength, softening, and erosion during dissolution.

Main Methods:

• Comparative study utilizing three USP XX dissolution models (rotating basket, paddle, modified disintegration apparatus) and a novel sandwich model.
• Evaluation of theophylline tablet erosion based on mechanical properties and softening behavior during dissolution testing.

Main Results:

• Tablet erosion is significantly influenced by mechanical strength and softening during dissolution.
• Soft tablets exhibited considerable erosion in rotating basket and disintegration apparatus models, but minimal erosion in paddle and sandwich models.
• Dissolution and erosion were found to mutually intensify, affecting drug release profile descriptions.

Conclusions:

• The choice of dissolution model critically impacts the observed erosion of tablets.
• Tablet mechanical properties and softening behavior are key determinants of erosion extent.
• Release profiles of hard and soft tablets can be better described by different mathematical models (e.g., square root vs. cube root equations).