Used primarily as a bronchodilator in respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). It helps relax the smooth muscles of the airways, improving airflow and easing breathing. Also exhibits mild stimulant effects on the central nervous system, which can enhance alertness and reduce fatigue. Employed in some over-the-counter medications for asthma relief, though its use has declined with the development of more selective agents. Occasionally used in research settings to study adenosine receptor antagonism due to its pharmacological activity.