Formulation and optimization of floating matrix tablets of clarithromycin using simplex lattice design

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Formulation Development

Background:

• Floating matrix tablets offer prolonged drug release and improved bioavailability.
• Clarithromycin is a key antibiotic requiring optimized delivery systems for effective treatment.
• Controlling drug release and buoyancy is crucial for effective floating tablet formulations.

Purpose of the Study:

• To prepare and optimize floating matrix tablets of clarithromycin.
• To investigate the influence of formulation variables on drug release and floating characteristics.
• To utilize simplex lattice design for efficient formulation optimization.

Main Methods:

• Floating matrix tablets were formulated using Hydroxypropyl methylcellulose (HPMC) and Ethyl Cellulose (EC) as matrix formers, and sodium bicarbonate and citric acid as effervescent agents.
• Simplex lattice design was employed to optimize three independent variables: HPMC concentration, citric acid concentration, and EC concentration.
• Formulations were evaluated for dissolution profiles (t50%, t90%, Mean Dissolution Time), floating characteristics (total floating time, floating lag time), drug content, weight variation, hardness, thickness, and friability.

Main Results:

• All formulations exhibited total floating times exceeding 12 hours and drug content within the acceptable range (98.54–99.92%).
• HPMC and EC concentrations significantly controlled drug release, while the ratio of sodium bicarbonate and citric acid affected floating lag time.
• Drug release followed non-Fickian or anomalous behavior (release exponent 'n' between 0.62–0.75), indicating complex release mechanisms.

Conclusions:

• Simplex lattice design proved effective for optimizing clarithromycin floating matrix tablets.
• The developed formulations show potential for sustained release and prolonged gastric residence time.
• Further studies can explore in vivo performance and therapeutic efficacy of these optimized clarithromycin floating tablets.