Soluble gentamicin ophthalmic inserts as a drug delivery system

Area of Science:

• Ophthalmology
• Pharmacology
• Biomaterials Science

Background:

• Gentamicin is a crucial antibiotic for treating bacterial eye infections.
• Current delivery methods like eye drops, ointments, and subconjunctival injections have limitations in achieving optimal drug concentrations.
• Developing effective drug delivery systems is essential for combating ocular infections.

Purpose of the Study:

• To compare the efficacy of a novel soluble collagen gentamicin ophthalmic insert against traditional administration routes.
• To quantify and compare gentamicin levels in ocular tissues and tear film across different delivery methods.
• To evaluate the potential of collagen inserts for enhanced ocular drug delivery.

Main Methods:

• Radiolabeled 14C-gentamicin was incorporated into soluble collagen inserts.
• Ophthalmic inserts, eye drops, ointment, and subconjunctival injections were administered to rabbits.
• Tear film, corneal, and scleral tissue samples were collected and analyzed for 14C-gentamicin concentration.

Main Results:

• The soluble collagen insert (wafer) route achieved the highest concentration of 14C-gentamicin in both tear film and ocular tissues.
• Subconjunctival injection resulted in unexpectedly low tear film concentrations of the drug.
• The insert demonstrated superior drug delivery compared to drops and ointment.

Conclusions:

• Soluble collagen inserts represent a promising new method for delivering high doses of gentamicin to infected corneal tissue.
• This delivery system offers a convenient and atraumatic approach for treating ocular infections.
• The insert's ability to achieve high tissue drug concentrations warrants further investigation for clinical application.