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Ophthalmic Drug Delivery Systems

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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...

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Related Experiment Video

Updated: Jun 22, 2026

Ocular Therapeutic Delivery and Advanced Tissue Retrieval in Adult Rats

Ocular Therapeutic Delivery and Advanced Tissue Retrieval in Adult Rats

Published on: May 23, 2025

Insulin delivery through the ocular route.

R Srinivasan¹, S K Jain

¹Department of Pharmaceutical Sciences, Dr. Harisingh Gour Vishwavidyalaya, Sagar, Madhya Pradesh, India.

|July 3, 2009

Summary

Ocular insulin delivery using liposomes and permeation enhancers significantly reduces blood glucose levels in rabbits. This novel approach enhances insulin absorption and prolongs its therapeutic effect.

Area of Science:

Pharmacology
Ophthalmology
Drug Delivery Systems

Background:

Insulin is crucial for glucose regulation.
Traditional insulin administration methods (subcutaneous, intravenous) have limitations.
Ocular insulin delivery offers a potential alternative route.

Purpose of the Study:

To evaluate the efficacy of ocular insulin administration for blood glucose reduction.
To investigate the role of permeation enhancers and liposomes in improving ocular insulin absorption.
To determine optimal insulin concentration and formulation for ocular delivery.

Main Methods:

Insulin solutions with and without permeation enhancers were administered ocularly to rabbits.
Various insulin concentrations and penetration enhancers, including polyoxyethylene-9-lauryl ether (POE), were tested.

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Insulin-loaded liposomes (positively charged, egg phosphatidylcholine, cholesterol, stearylamine) were prepared and administered.

Blood glucose levels were monitored post-administration.

Main Results:

Ocular administration of free insulin showed no effect on blood glucose without enhancers.
Polyoxyethylene-9-lauryl ether (0.8% w/w) improved ocular absorption and compatibility.
A 10 U/kg dose was found to be optimal for ocular instillation.
Insulin-loaded positively charged liposomes significantly reduced blood glucose levels within 90-120 minutes.

Conclusions:

Ocular insulin delivery is feasible with appropriate enhancers and formulations.
Liposomal encapsulation enhances ocular absorption and prolongs insulin action.
This method holds promise for improved diabetes management through non-invasive ocular drug delivery.