IRCT20210718051920N2 IRCT 2021-07-31 Kerman University of Medical Sciences Evaluation of the efficacy of nasal spray formulation containing tea tree oil in the treatment of seasonal allergic rhinitis Evaluation of the efficacy of nasal spray formulation containing tea tree oil in the treatment of seasonal allergic rhinitis: a randomized double-blind placebo-controlled clinical trial 2021-07-27 anticipated 70 Complete https://irct.ir/trial/57562 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Blocked randomization will be done using randomly selected block sizes of 4, 6 and 8. For example a block size of 4 randomizes 4 participants, and each participant is assigned to one of the intervention or control groups based on the arranged series of the groups in this block. The researcher evaluating the patients will not be aware of the sizes of blocks and sequence of their selection, Blinding description: The patients and investigators who evaluate therapeutic responses of the patients and who analyzes the results will be blinded. 3 Seasonal allergic rhinitis. Intervention 1: Intervention group 1: patients will receive a puff of the nasal spray containing tea tree oil two times per day for 14 days. Intervention 2: Intervention group 2: patients will receive a puff of the placebo nasal spray, which is similar to the tea tree oil spray in shape, size, and color but contains 0.9% sodium chloride, two times per day for 14 days. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no further information.