The CBF Study Evaluating the Effect of Betahistine on the Cerebral Blood Flow

Inclusion Criteria: 1. Subjects with gait or balance disorder problems 2. Male and female subjects aged on 40 years and above. 3. Absence of known contraindications for betahistine treatment. 4. Currently not on betahistine (of any formulation) treatment for at least 45 days prior to inclusion in the study. 5. Subject consuming caffeinated or alcoholic beverages should have stable consumption throughout the study period. Exclusion Criteria: 1. History of discontinuation of betahistine treatment (of any formulation) in the past due to lack of efficacy or side effects. 2. Subjects treated with antihistamines and monoamine oxidase (MAO) inhibitors 30 days prior to inclusion in the study. 3. Subjects with hypersensitivity to the active substance or to any of the excipients of the drug. 4. Phaeochromocytoma 5. Porphyria