Efficacy and Tolerability of a Topical Microemulsion in Patients With Allergic Rhinitis Due to Sensitization to Pollen

Study design: Randomized, controlled, double-blind, parallel, multicentre multinational clinical trial, to show superiority of an active therapy as compared to a control therapy on intermittent or persistent Allergic Rhinitis. Primary objective: 1. To show that a topical microemulsion is superior to a sterilized saline solution to prevent deterioration in the health related quality of life, in patients with intermittent or persistent allergic rhinitis due to sensitization to birch, olive tree or grass pollen. Secondary objectives 2. To explore the effect of a topical microemulsion, as compared to a sterilized saline solution, for the prevention of nasal and ocular symptoms in patients with intermittent or persistent allergic rhinitis due to sensitization to birch, olive tree or grass pollen. 3. To explore the effect of a topical microemulsion, as compared to a sterilized saline solution, in the utilization of symptomatic medications, in patients with intermittent or persistent allergic rhinitis due to sensitization to birch, olive tree or grass pollen. 4. To assess the patient's satisfaction with a topical microemulsion treatment, as compared to a sterilized saline solution, in patients with intermittent or persistent allergic rhinitis due to sensitization to birch, olive tree or grass pollen. 5. To assess the safety of a topical microemulsion, as compared to a sterilized saline solution, administered to patients with intermittent or persistent allergic rhinitis due to sensitization to birch, olive tree or grass pollen. This is a clinical investigation study of a Class 1 medical device product. This is a prospective study of an active medical device versus a control medical device. It was considered feasible to recruit 10 patients patients per center, and therefore the study should be conducted in 10 centers. To get treatment balance within each center, a total of 100 patients should be recruited.