Transdermal administration of emedastine

Area of Science:

• Pharmacology and Pharmaceutics
• Dermatology
• Drug Delivery Systems

Background:

• Emedastine is an antihistamine with potential for transdermal application.
• Understanding drug permeability through the skin is crucial for effective transdermal drug delivery systems.
• Vehicle composition significantly influences drug partitioning and skin penetration.

Purpose of the Study:

• To evaluate the in vitro and in vivo transdermal permeability of emedastine.
• To investigate the influence of different vehicles on emedastine's transdermal absorption.
• To compare the bioavailability of transdermally administered emedastine with peroral administration.

Main Methods:

• In vitro studies using diffusion cells to assess emedastine permeability across skin models.
• In vivo studies in rabbits to evaluate transdermal absorption and bioavailability.
• Analysis of emedastine flux in vitro and correlation with in vivo pharmacokinetic parameters.

Main Results:

• Emedastine free base demonstrated higher permeability than emedastine difumarate in vitro.
• Hydrophobic vehicles, particularly fatty acid monoesters, enhanced emedastine permeability.
• In vivo studies confirmed high permeability from fatty acid esters, with superior bioavailability compared to oral administration.

Conclusions:

• Transdermal administration of emedastine exhibits very high skin permeability.
• Fatty acid monoesters and diesters are effective vehicles for enhancing transdermal emedastine delivery.
• Emedastine is a promising candidate for efficacious transdermal drug administration.