Recent advances in controlled pulmonary drug delivery

Area of Science:

• Pharmacology and Pharmaceutics
• Biomedical Engineering
• Respiratory Medicine

Background:

• Pulmonary drug delivery leverages the lung's large surface area, high vascularization, and thin barrier for efficient administration.
• Current inhalable products are often short-acting, necessitating frequent use and leading to poor patient compliance.
• Controlled pulmonary drug delivery systems aim to improve therapeutic outcomes and patient adherence.

Purpose of the Study:

• To review the challenges hindering the development of controlled pulmonary drug delivery systems.
• To present strategies for overcoming airway clearance mechanisms and achieving sustained drug release in the lungs.
• To identify promising carrier systems for advanced pulmonary drug delivery.

Main Methods:

• Literature review of existing research on pulmonary drug delivery barriers and solutions.
• Analysis of particle engineering strategies for controlled release in the pulmonary system.
• Evaluation of carrier systems including large porous particles, swellable microparticles, and nanoparticle aggregates.

Main Results:

• Airway clearance mechanisms represent a significant barrier to sustained drug delivery in the lungs.
• Particle design is crucial for evading clearance and achieving controlled drug release.
• Large porous particles, swellable microparticles, and porous nanoparticle-aggregate-based particles show promise.

Conclusions:

• Overcoming pulmonary defense mechanisms is key to successful controlled drug delivery.
• Advanced particle carriers offer viable strategies for sustained lung drug release.
• Future development should focus on these promising carrier systems for improved patient compliance and therapeutic efficacy.