Minophylline is used to treat respiratory diseases such as chronic asthma, as it works to calm the smooth muscles in the lungs and bronchi, which contributes to improving a person's ability to breathe. Minophylline is also used to treat bronchial obstructive syndrome from multiple sources, such as bronchial asthma, chronic obstructive pulmonary disease, high blood pressure in the lungs, pulmonary heart disease, and renal edema syndrome, in addition to treating sleep apnea.