Development and mathematical simulation of theophylline pulsatile release tablets

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems

Background:

• Pulsatile drug release systems are crucial for optimizing therapeutic outcomes by mimicking physiological rhythms.
• Developing stable and effective pulsatile release formulations requires careful selection of coating materials and excipients.

Purpose of the Study:

• To develop and characterize theophylline pulsatile release tablets with a fast-swelling core and ethylcellulose coating.
• To investigate the impact of various formulation parameters on drug release profiles.

Main Methods:

• Systematic screening of coating polymers, plasticizers, subcoating agents, disintegrants, and coating levels.
• Evaluation of drug release profiles, lag time, and rupture time.
• Water uptake studies to determine the apparent diffusion coefficient.
• Development and validation of a mathematical model for lag time prediction.

Main Results:

• Ethylcellulose demonstrated suitability as a polymer for pulsatile release.
• Optimized plasticizer concentration (15%) and Methocel E50 subcoating yielded desirable lag and release phases.
• Disintegrant type significantly influenced lag time, with crospovidone showing the longest lag.
• Coating level correlated positively with rupture time.
• The developed mathematical model accurately predicted lag times.

Conclusions:

• The study successfully developed theophylline pulsatile release tablets with tunable release characteristics.
• Formulation parameters, including coating material, plasticizer, subcoating, disintegrant, and coating level, critically influence pulsatile release.
• The predictive model offers a valuable tool for designing future pulsatile drug delivery systems.