The present invention provides an improved process for the preparation of 1-bromo-3,5-dimethyladamantane. The present invention also provides a process for preparing free flowing solid of 1-acetamido-3,5-dimethyladamantane. The present invention further provides a process for the preparation of memantine hydrochloride substantially free of 1-amino-3,5,7-trimethyladamantane hydrochloride and/or 1-amino-3-methyladamantane hydrochloride impurity.