Conditions: Primary Disease
Keywords: allergic rhinoconjunctivitis
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 381
Healthy volunteers: no

Brief summary:
The purpose of this study is to evaluate the efficacy and safety of sublingual tablets of grass pollen allergen extract when initiated 2 months before the grass pollen season compared with placebo for reduction of rhinoconjunctivitis symptoms and rescue medication usage.

Detailed description:
To assess the efficacy of sublingual tablets of grass pollen allergen extract when initiated 2 months before the grass pollen season on:

\- The Average Adjusted Symptom Score (AASS).

To document the safety of the treatment.

Arms:
arm 1: 300 IR grass pollen allergen extract tablet arm 2: Placebo tablet

Interventions: intervention 1: 300 IR intervention 2: Placebo
Intervention descriptions: intervention 1: 300 IR grass pollen allergen extract tablet starting 2 months before the grass pollen season and during the grass pollen season intervention 2: Placebo sublingual tablet starting 2 months before the grass pollen season and during the grass pollen season

Protocol document: