Dose-finding study of carbamylated monomeric allergoid tablets in grass-allergic rhinoconjunctivitis patients

Aim: To determine the optimal effective and safe dose of sublingual immunotherapy tablets containing carbamylated monomeric allergoids in patients with grass pollen-induced allergic rhinoconjunctivitis. Methods: In this prospective, randomized, double-blind, active-controlled, multicenter, Phase II study, four different daily doses were applied preseasonally for 12 weeks. Results: Of 158 randomized adults, 155 subjects (safety population) received 300 units of allergy (UA)/day (n=36), 600 UA/day (n=43), 1000 UA/day (n=39), or 2000 UA/day (n=37). After treatment, 54.3, 47.6, 59.0 and 51.4% of patients, respectively, ceased to react to the highest allergen concentration in a conjunctival provocation test. Furthermore, the response threshold improved in 70.4, 62.9, 76.7 and 66.7% of patients, respectively. No serious adverse events occurred. Conclusion: This study found 1000 UA/day to be the optimal effective and safe dose