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Related Concept Videos

Ophthalmic Drug Delivery Systems01:23

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...
Drug Delivery: Miscellaneous Routes01:22

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 through the...

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Related Experiment Video

Updated: May 16, 2026

Use of Rabbit Eyes in Pharmacokinetic Studies of Intraocular Drugs
10:02

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Published on: July 23, 2016

Dexamethasone eye drops containing γ-cyclodextrin-based nanogels.

Maria D Moya-Ortega1, Tiago F G Alves, Carmen Alvarez-Lorenzo

  • 1Faculty of Pharmaceutical Sciences, University of Iceland, Hofsvallagata 53, IS-107 Reykjavik, Iceland.

International Journal of Pharmaceutics
|November 15, 2012
PubMed
Summary
This summary is machine-generated.

New cyclodextrin nanogel eye drops provide sustained release of dexamethasone, significantly improving ocular drug delivery compared to conventional formulations. These novel eye drops offer enhanced therapeutic potential for eye conditions.

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Area of Science:

  • Ophthalmology
  • Materials Science
  • Pharmaceutics

Background:

  • Dexamethasone is a potent corticosteroid used to treat ocular inflammation.
  • Conventional eye drop formulations often suffer from rapid clearance and poor bioavailability.
  • Cyclodextrin nanogels offer a promising platform for sustained drug delivery.

Purpose of the Study:

  • To design and evaluate sustained-release aqueous eye drops of dexamethasone using gamma-cyclodextrin (γCD) nanogels.
  • To optimize nanogel composition for drug loading and release rate.
  • To assess the in vivo efficacy and safety of the novel eye drop formulation in rabbits.

Main Methods:

  • γCD nanogels were prepared via emulsification/solvent evaporation.
  • Nanogel composition was optimized for dexamethasone loading and release.
  • Aqueous eye drops containing dexamethasone and 2-hydroxypropyl-γ-cyclodextrin (HPγCD) with γCD nanogels were formulated.
  • In vivo studies were conducted in rabbits, comparing nanogel eye drops to Maxidex®.

Main Results:

  • Nanogel eye drops maintained a near-constant dexamethasone concentration in tear fluid for at least 6 hours (295±59 μg/ml).
  • Maxidex® showed a rapid decline in tear fluid dexamethasone concentration (9.72±3.45 μg/ml at 1h to 3.76±3.26 μg/ml at 3h).
  • Maximum dexamethasone concentration in aqueous humor was significantly higher with nanogel eye drops (136±24 mg/ml) compared to Maxidex® (44.4±7.8 μg/ml).

Conclusions:

  • Dexamethasone-loaded cyclodextrin nanogel eye drops provide superior sustained release and enhanced ocular bioavailability.
  • The novel formulation demonstrates significant potential for improved treatment of ocular inflammatory conditions.
  • The nanogel eye drops were well-tolerated in vivo, showing no signs of toxicity or irritation.