The purpose of this study was to evaluate the effect of betahistine and dimenhydrinate medications in BPPV after epley maneuver. In this study, 120 patients who their BPPV is prove with the history taking, physical examination and hallpike dix test, will be studied. Inclusion criteria: 1. Unknown BPPV 2. Patients who don't receive any medication. Exclusion criteria: 1. The inner ear disease 2. The inner or middle ear surgery 3. Migraine and headache during the study period. 4. Using Psycho-neurological drugs during the study 5. The involvement more than one of semi-circular canal 6.Re-Appearance of nystagmus after epley maneuver. Sampling will continue to reach 120 patients, The questionnaire Dizziness Handicap Inventory (DHI) and Berg balance scale (modified) will be filled for all patients. They will be divided into three treatment groups as double-blind randomized. Patients will receive drugs in sealed coded boxes. physician and patient are not aware of the content of drug boxes . Data eventually will be analyzed based on the Drugs box codes, selection of drug box will be random, and through balls and bags method . As a result, participants, observers have not any information about the drugs which patients will receive. Group 1: Epley maneuver with dimenhydrinate - Group 2: Epley maneuver with betahistine - Group 3: Epley maneuver with placebo. One week after epley maneuver, all patients undergoing hallpike maneuver. In the absence of nystagmus, the patients evaluated for symptoms such as light headedness, a feeling of floating, dizziness, ear fullness and weakness. DHI and Berg questionnaire to be filled for patients again.