Doximar® 400 mg Tablet is a bronchodilator medication produced by ACI Limited in Bangladesh. Each tablet contains 400 mg of Doxofylline, a xanthine derivative that relaxes bronchial smooth muscles by inhibiting phosphodiesterase-4 (PDE-4). It is used to treat respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and bronchospasm. Doxofylline has a better safety profile compared to theophylline, with fewer cardiovascular and gastrointestinal side effects.