An Evaluation of Onset and Duration of Action of Patanol® (Olopatadine Hydrochloride Ophthalmic Solution 0.1%) Compared to Claritin® (Loratadine 10 mg) Tablets in Acute Allergic Conjunctivitis in the Conjunctival Allergen Challenge Model

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Abstract
: Purpose: To compare the clinical efficacy of Patanol® (olopatadine hydrochloride ophthalmic solution 0.1%) to Claritin® (loratadine 10 mg) tablets, in the conjunctival allergen challenge model.Methods: This was a randomized, double‐masked, single center, contralateral controlled, antigen challenge model study. The concentration of allergen that elicited a positive response was determined at Visits 1 and 2 (itching ≥2 and redness ≥2 OU). At Visit 3, 29 subjects were randomized into two groups. Fifteen subjects received Claritin® tablet and Patanol® ophthalmic solution 0.1% in one eye and placebo in the contralateral eye. Fourteen subjects received placebo tablet and Patanol® in one eye and placebo in the contralateral eye. One hour after drug administration, subjects were challenged with the antigen that elicited a positive response. At 3, 7, and 10 minutes, itching was subjectively evaluated. At Visit 4, the same procedure was followed as in Visit 3, but antigen challenge occurred 8 hours after drug instillation.Results: Results were analyzed by eye. Eyes treated with Patanol® (concomitant with placebo tablet) had significantly lower ocular itching scores when compared to eyes treated with placebo (concomitant with Claritin®) at 3, 7 and 10 minutes in the onset of action evaluation (p® (concomitant with placebo tablet) had significantly lower ocular itching scores at 7 minutes and there was a statistical trend (0.05Conclusions: Patanol® therapy was significantly more efficacious than Claritin® in reducing ocular itching related to allergic conjunctivitis.

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