ArticleAllergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology2026
Low risk of ocular toxicity following topical ocular administration of epinephrine nasal spray: implications for unintentional exposure.
Article in Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionUnintentional ocular exposure to epinephrine nasal spray (10 mg/mL epinephrine) is a potential safety concern. Although epinephrine is used in multiple ocular formulations, unintentional ocular administration of epinephrine nasal spray was assessed to determine tolerability and support the overall safety profile.
methodsA non-GLP ocular tolerability study was conducted using six naïve New Zealand White rabbits (3 males, 3 females). Vehicle control or epinephrine nasal spray (1 mg) was applied to the right or left eye, respectively, once on Day 1. Animals were monitored over seven days for mortality, clinical signs, body weight changes, ophthalmic findings, ocular irritation (using the Modified Hackett-McDonald Scoring System), and gross necropsy findings.
resultsEpinephrine nasal spray was well tolerated with no mortality, clinical abnormalities, or changes in body weight. Ophthalmic examinations via indirect ophthalmoscopy and slit-lamp biomicroscopy revealed no signs of irritation or ocular toxicity. No gross pathological changes were noted at necropsy.
conclusionA single topical administration of epinephrine nasal spray (10 mg/mL) in rabbit eyes was not associated with any adverse effects, indicating a low risk of ocular toxicity. These results support the safety of epinephrine nasal spray in the event of unintentional ocular exposure and taken together with epinephrine's use in other ocular formulations, suggest that no further nonclinical ocular studies are necessary.
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