Povidone-iodine liposomes--an overview

Area of Science:

• Pharmaceutical Sciences
• Biotechnology
• Ophthalmology

Background:

• Liposomes are advanced drug delivery systems with approved applications in Europe, USA, and Japan.
• Liposomes offer targeted topical activity, enhanced efficacy, and reduced toxicity compared to conventional formulations.
• Povidone-iodine (PVP-I) possesses potent microbicidal properties, and its combination with liposomes aims to improve tolerability and wound healing.

Purpose of the Study:

• To develop and evaluate liposomal povidone-iodine (PVP-I) formulations for ophthalmic applications and antiseptic wound treatment.
• To assess the antimicrobial efficacy, tolerability, and wound healing properties of novel liposomal PVP-I formulations.

Main Methods:

• Development of liposomal PVP-I eye drops (2.5% and 5.0%) and a liposomal PVP-I hydrogel (3%).
• In vitro antimicrobial testing and placebo-controlled clinical studies in volunteers for eye drops.
• Animal studies in rabbits for evaluating eye infection treatment and dermal burn wound healing.

Main Results:

• Liposomal PVP-I eye drops demonstrated excellent in vitro antimicrobial efficacy and very good local tolerability in human volunteers.
• In a rabbit model, PVP-I liposome eye drops showed positive results against Staphylococcus aureus deep eye infection.
• The 3% liposomal PVP-I hydrogel formulation promoted outstanding wound healing in deep dermal burn wounds, with reduced inflammation and improved tissue regeneration.

Conclusions:

• Liposomal PVP-I represents a promising approach for developing effective and well-tolerated ophthalmic antiseptics and advanced wound care products.
• The enhanced delivery system improves the therapeutic profile of povidone-iodine for both ocular and dermal applications.
• Further clinical evaluation is warranted to establish the full potential of these liposomal PVP-I formulations in medical practice.