A randomized, double-blind, parallel-group comparison of olopatadine 0.1% ophthalmic solution versus placebo for controlling the signs and symptoms of seasonal allergic conjunctivitis and rhinoconjunctivitis.

BACKGROUND

The most common form of allergic ocular disease is seasonal allergic conjunctivitis, coinciding with the pollen season and generally associated with rhinitis. Symptoms of allergic conjunctivitis include ocular itching, hyperemia, tearing, mucus production, foreign body sensation, chemosis, and lid edema. Similarly, the primary symptoms of allergic rhinoconjunctivitis are nasal itching, irritation, sneezing, watery rhinorrhea, and congestion combined with ocular itching, tearing, and swelling.

OBJECTIVE

This study compared olopatadine 0.1% ophthalmic solution with placebo eyedrops (over-the-counter artificial tear product), instilled in the eye, with regard to the prevention and relief of the ocular and nasal symptoms of seasonal allergic conjunctivitis and rhinoconjunctivitis.

METHODS

This was a randomized, double-blind, parallel-group study, conducted at 7 US centers, to instill either olopatadine 0.1% ophthalmic solution or placebo eyedrops (artificial tears) in both eyes twice daily for 10 weeks. Patients were evaluated for efficacy (intent-to-treat) and safety. Only patients with proven grass pollen allergy (dermal and conjunctival allergen challenge tests) were selected; all patients were studied during the same period, historically shown to be grass season; and grass pollen counts were obtained.

RESULTS

A total of 131 patients (64 olopatadine; 67 placebo) were assessed for efficacy (intent-to-treat); 132 patients were assessed for safety. The mean (SD) age of participants was 38.53 (11.61) years (range, 18 to 87 years), and 58.0% were women (76/131), with no significant differences between groups for age or sex. In the olopatadine group, 1.6% of patients were black (1/64), compared with 14.9% of the placebo group (10/67) (P = 0.005). Mean scores of ocular itching and hyperemia were lower at all assessment times with olopatadine than placebo. The difference was statistically significant (P < 0.05) for itching on days 7, 14, 35, 63, and 70, and for hyperemia on days 14, 28, 42, and 63, after correction for multiplicity. Linear regression slopes predicting ocular itching and hyperemia from the pollen count were significantly lower (P < 0.003 and P < 0.035, respectively) with olopatadine than with placebo. Similar results were obtained for rhinorrhea, sneezing, and nasal itching (P < 0.006, P < 0.012, and P < 0.034, respectively). With placebo, the proportion of patients with frequent ocular itching and hyperemia increased as a function of pollen level; however, with olopatadine, the proportions remained low and virtually constant.

CONCLUSION

In the population studied, olopatadine 0.1% ophthalmic solution controlled ocular and nasal symptoms of allergic conjunctivitis and rhinocojunctivitis and was well tolerated when administered twice daily for 10 weeks.