Dry Powder for Pulmonary Delivery: A Comprehensive Review

Area of Science:

• Pulmonary drug delivery
• Pharmaceutical sciences
• Biotechnology

Background:

• The pulmonary route is advantageous for local and systemic drug delivery due to physiological benefits and patient convenience.
• Pulmonary drug formulation is challenging due to aerodynamic size constraints and lung sensitivity.
• Physicochemical properties of dry powders significantly impact aerosolization, deposition, and clearance in the respiratory tract.

Purpose of the Study:

• To review the respiratory tract's structure and drug deposition patterns.
• To discuss lung drug clearance mechanisms.
• To provide an overview of dry powder physicochemical properties, preparation techniques, and factors influencing clinical efficacy.

Main Methods:

• Literature review focusing on pulmonary drug delivery.
• Analysis of established and alternative manufacturing methods for dry powders.
• Examination of factors affecting aerosolization, deposition, and clearance.

Main Results:

• Key physiological and patient-convenience advantages of pulmonary drug administration are identified.
• Challenges in dry powder formulation for inhalation are highlighted, including aerodynamic size and lung tolerance.
• Various manufacturing techniques, including milling, spray-drying, and novel methods, are presented.

Conclusions:

• Understanding respiratory tract dynamics and particle properties is crucial for successful pulmonary drug delivery.
• Optimizing dry powder formulation and manufacturing is essential to overcome delivery challenges.
• Addressing future challenges will enhance the clinical efficacy of inhaled therapies.