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Allergy to ophthalmic preservatives.

Jison Hong¹, Leonard Bielory

¹UMDNJ - New Jersey Medical School, Newark, USA.

Current Opinion in Allergy and Clinical Immunology

|August 22, 2009

Summary

Preservatives in eye drops can cause hypersensitivity reactions, ranging from inflammation to toxic effects. Benzalkonium chloride is linked to toxic reactions, while thimerosal and chlorobutanol are associated with allergic responses.

Area of Science:

Ophthalmology
Immunology
Toxicology

Background:

Topical ophthalmic therapies commonly utilize preservatives to maintain sterility.
Preservatives, while essential, can elicit adverse reactions in ocular tissues.
Understanding these reactions is crucial for patient safety and treatment efficacy.

Purpose of the Study:

To review hypersensitivity reactions induced by preservatives in topical ophthalmic treatments.
To categorize the types of hypersensitivity reactions observed.
To identify specific preservatives associated with different reaction profiles.

Main Methods:

Literature review of clinical and experimental studies.
Analysis of reported hypersensitivity reactions to various preservative classes.

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Examination of immunological mechanisms involved.

Main Results:

Ocular hypersensitivity reactions include IgE-mast cell mediated, cell-mediated, and toxic responses.
Benzalkonium chloride (a quaternary ammonium) is most frequently linked to irritant toxic reactions (8% of reported cases).
Organomercurials (thimerosal) and alcohols (chlorobutanol) show the highest association with allergic responses (19% and 20% of reported cases, respectively), though 'allergic' reactions to alcohols may be irritant effects, while organomercurials act as neoantigens.

Conclusions:

Preservatives in ophthalmic medications can cause a spectrum of effects, from inflammation and hypersensitivity to permanent cytotoxic damage.
All ocular structures can be affected by these preservative-induced reactions.
Further research is needed to elucidate the precise mechanisms and develop safer preservative alternatives.