Adherence to treatment is crucial to the efficacy of sublingual immunotherapy of allergic diseases. GRAZAX® is a registered drug in Europe, with established efficacy in the treatment of allergic rhinitis, which has to be taken daily by patients. This study was aimed to establish if a device with the characteristics of a mechanical dispenser (Memozax®) could improve adherence to treatment in subjects with hay fever due to allergy to grass

Inclusion Criteria:

• A clinical history of grass pollen-induced allergic rhinoconjunctivitis (with or without asthma) having received treatment during the previous grass pollen season.
• Positive skin prick test (SPT) response (wheal diameter ≥3mm) to Phleum pratense
• Positive specific IgE against Phleum pratense (IgE titer > class 2)

Exclusion Criteria:

• Clinical history of chronic sinusitis during the last 2 years or of symptomatic perennial or seasonal allergic rhinitis and/or asthma having received regular medication, due to another allergen during - or potentially overlapping - the grass pollen season.
• Clinical history of severe asthma (GINA Step 4 and children with Forced Expiratory Volume in 1 second (FEV1) < 80% of expected value after treatment with inhaled corticosteroids and short-acting β2 agonists)
• Previous treatment by immunotherapy with grass pollen allergen or any other allergen within the previous 5 years