This study is designed to assess the effects of ketotifen fumarate drop and compares it with Ketotifen pill within 4-weeks after intervention. One hundred and fifty mild allergic rhinitis patients, referred to Baqiyatallah University of Medical Sciences Allergy Clinic will be enrolled to the study. Allergic rhinitis approves by clinical examination, history, and diagnostic tests. Patients consuming antihistamines and corticosteroids, refractory to antihistamines and leukotriene receptor antagonists, patients with asthma, acute and chronic rhino-sinusitis, polyposis, consuming tricyclic antidepressants and allergy to ketotifen will be excluded. Patients will be randomized to ketotifen fumarate 0.025% drop (one drop in each side of nose every 12 hours) with placebo pills (every 12 hours) and Placebo drop (one drop every 12 hours), with ketotifen pills (1 mg every 12 hours) groups. Patients will be evaluated by endoscopy, symptoms (sneezing, runny nose, itching, and nasal obstruction) severity score (0-10 VAS score), quality of life, and eosinophil percent for nasal smears, within 4-weeks treatment in 3 visits. Collected data will be compared in two groups.