Efficacy of Alcaftadine 0.25% (AGN-229666) for Once-daily Prevention of Cedar-Pollen Allergic Conjunctivitis: A Phase 3 Randomized Study.

: This study evaluated the efficacy and safety of once-daily Alcaftadine 0.25% (AGN-229666) for prevention of signs and symptoms of Japanese cedar-pollen allergic conjunctivitis.: This was a single-center, placebo-, and comparator-controlled study using the Ora-CAC® model of allergic conjunctivitis. The primary endpoint was ocular itching 16 hours after Alcaftadine 0.25% instillation; efficacy at 16 hours was compared with 0.1% Olopatadine, 4 hours after instillation. Secondary endpoints included conjunctival hyperemia.: 263 Japanese subjects were enrolled; 224 completed the trial. Alcaftadine 0.25% was statistically superior to vehicle for relief of ocular itching at 16 hours ( < .0001). Alcaftadine 0.25% at 16 hours was non-inferior to Olopatadine at 4 hours. Alcaftadine 0.25% was significantly better than vehicle for relief of conjunctival hyperemia. All treatments showed a low frequency of ocular adverse events.: Once-daily Alcaftadine 0.25% is safe and effective in preventing signs and symptoms of Japanese cedar-pollen allergic conjunctivitis.