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Ophthalmic Drug Delivery Systems

Ophthalmic Drug Delivery Systems

Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...

Modified-Release Drug Delivery Systems: Site-Targeted

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.

Modified-Release Drug Delivery Systems: Rate-Programmed II

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...

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Related Experiment Video

Updated: Jun 9, 2026

Encapsulated Cell Technology for the Delivery of Biologics to the Mouse Eye

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Published on: March 30, 2020

Random Copolyester-Based Delivery Systems for Tear Protein Therapeutics in Ocular Surface Disorders.

Gloria Astolfi¹, Giulia Guidotti², Michelina Soccio²

¹Ophthalmology Unit, DIMEC, Alma Mater Studiorum University of Bologna, Bologna 40138, Italy.

|June 8, 2026

Summary

This summary is machine-generated.

New polymeric drug delivery platforms offer sustained release for ocular surface disorders like dry eye disease (DED). These biocompatible devices improve drug delivery compared to frequent eye drops.

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Area of Science:

Biomaterials Science
Ocular Drug Delivery
Polymer Chemistry

Background:

Conventional ocular therapies for dry eye disease (DED) and corneal disorders suffer from poor bioavailability and patient adherence due to frequent eye drop administration.
There is a need for advanced drug delivery systems that provide sustained and localized drug release for improved therapeutic outcomes.

Purpose of the Study:

To develop and characterize novel poly-(butylene succinate/diglycolate) copolymer-based platforms for conjunctival drug delivery.
To evaluate the drug loading and sustained release capabilities of these polymeric devices using therapeutic proteins.

Main Methods:

Synthesis and characterization of poly-(butylene succinate/diglycolate) copolymers (P-(BSxBDGy)) with varying molar ratios.
Fabrication of prototype cylindrical drug delivery devices via microinjection molding.
In vitro evaluation of protein release kinetics and cytotoxicity assays to assess biocompatibility.

Main Results:

The synthesized copolymers exhibited suitable molecular structures, thermal, mechanical, and surface properties for ocular applications.
Polymeric devices demonstrated sustained release of lysozyme and lactoferrin, with proteins maintaining structural integrity.
In vitro cytotoxicity assays confirmed the biocompatibility of the materials, supporting cell viability.

Conclusions:

Poly-(BS50BDG50) and P-(BS20BDG80) based devices show promise for ocular drug delivery due to their structural adaptability and controlled release kinetics.
These platforms offer a potential solution for targeted and prolonged drug administration in ocular diseases requiring frequent treatment.
The developed polymeric systems are compatible with biologically active macromolecules, indicating their therapeutic potential.