Parallel, Double-dummy, Superiority Study Levocetirizine/Pseudoephedrine x Zina for Allergic Rhinitis in Brazil

The investigational drug consists of a fixed-dose combination (FDC) that contains levocetirizine, a second-generation anti-H1 antihistamine agent, and pseudoephedrine, an oral decongestant, in doses of 5mg and 240mg, respectively, in the dosage form of film-coated tablets. This product is an unprecedented FDC in the country that is indicated for the symptomatic treatment of allergic rhinitis (AR) in patients aged ≥ 12 years. A multicenter, randomized, parallel-group, double-blind, double-dummy, superiority, active-controlled clinical trial. Adolescents and adults (aged ≥ 12 years) of both sexes with intermittent or persistent AR will be randomized in a 1:1 ratio to receive the investigational drug (FDC levocetirizine 5mg / pseudoephedrine 240mg from Eurofarma Laboratórios S.A.) or levocetirizine 5mg (Zina®), once daily (morning), for seven (07) days. The severity of nasal allergy symptoms in the last 24 hours (nasal obstruction, runny nose, sneezing and nasal pruritus) will be evaluated through the application of the assessment questionnaire for nasal symptoms in the last 24 hours before, during and at the end of treatment. The severity of the nasal obstruction at that timepoint will also be evaluated immediately before and one (01) hour after the administration of the first dose of the study treatment, carried out at the research site (also in the morning). Participants will be monitored for an additional seven (07) days for safety assessment.