"Efficacy and Safety of Phlai Capsule Compared to Placebo as the Treatment in Allergic Rhinitis Patients"

Inclusion Criteria: * Age 18-50 years old * Allergic rhinitis following diagnostic criteria of ARIA guideline * Reflective total 5 symptoms score 2-10 per day for 3 consecutive days (total score=15) and not greater than 10 in any days during the past week * Positive skin prick test to at least one aeroallergen: wheal size ≥ 3 mm greater than negative control * Not receiving intranasal corticosteroid + intra antihistamine for 2 weeks , intranasal corticosteroid for 2 weeks, systemic corticosteroid for 4 weeks, antihistamine for 1 week, nasal decongestant for 1 week and leukotriene receptor antagonists for 1 week Exclusion Criteria: * Serious medical underlying diseases e.g. COPD, Heart disease, Chronic renal failure, chronic hepatic failure * Allergic rhinitis and asthma which require immunotherapy * Receiving antidepressants, sedative, anxiolytic, opioids, neuroleptic * Uncontrolled asthma which requires steroid inhaler, LABA and does not use leukotriene receptor antagonists * Previous nasal surgery for nasal polyp, nasal septum deviation * Acute or chronic rhinosinusitis * Pregnancy and lactation (Urine pregnancy test is allowed and paid by researchers) * Allergic to any kinds of herb * Refusal to participation