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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...

Modified-Release Drug Delivery Systems: Stimuli-Activated

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also...

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...

Drug Delivery: Miscellaneous Routes

Drug Delivery: Miscellaneous Routes

Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection, and rectal administration provide localized effects with reduced toxicity.
Oral inhalation and nasal sprays swiftly transfer drugs across the respiratory epithelium's mucosal layer. Inhaled glucocorticoids and bronchodilators directly target lung conditions such as asthma, while fluticasone nasal spray mitigates allergic rhinitis.
Transdermal patches transport drugs...

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Related Experiment Video

Updated: Mar 31, 2026

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Published on: April 16, 2018

Thermo-Responsive Hydrogels for Ocular Drug Delivery.

Jennifer J Kang-Mieler, William F Mieler

Developments in Ophthalmology

|October 27, 2015

Summary

Hydrogels show promise for ocular drug delivery due to their water-absorbing, cross-linked structure. This versatile platform can sustain drug release and protect therapeutic agents for improved eye treatments.

Area of Science:

Biomaterials Science
Ophthalmology
Drug Delivery Systems

Background:

Hydrogels are hydrophilic polymeric networks with high water absorption capacity.
They form cross-linked structures capable of swelling and retaining solvents.
Hydrogels offer potential for sustained drug release in various applications.

Purpose of the Study:

To explore the potential of hydrogels as a drug delivery platform for ocular applications.
To highlight the characteristics of hydrogels that make them suitable for sustained drug delivery.
To discuss the versatility of hydrogels in accommodating different types of therapeutic agents.

Main Methods:

Review of hydrogel properties, including swelling, permeation, and diffusion characteristics.

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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Published on: February 27, 2016

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Last Updated: Mar 31, 2026

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

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Published on: April 16, 2018

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

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Published on: February 27, 2016

Discussion of hydrogel compatibility with nano- or microspheres for enhanced delivery.

Analysis of the protective aqueous environment provided by hydrogels for cells and agents.

Main Results:

Hydrogels can effectively absorb and retain large volumes of water or biological fluids.
Their tunable properties allow for the controlled release of both hydrophobic and hydrophilic agents, including small molecules and macromolecules.
Integration with nano- or microspheres can further enhance drug delivery capacity.
The aqueous hydrogel environment protects sensitive pharmacological agents and cells.

Conclusions:

Hydrogels represent a highly promising platform for ocular drug delivery.
Their adaptable nature allows for tailored drug release profiles and enhanced therapeutic efficacy.
Hydrogels can be designed as either non-degradable or degradable systems based on application requirements.