Adesin Adenosine Theophylline
ModerateTheophylline can block the effects of adenosine. Adenosine is the drug in question here, and its action is weakened when it is taken alongside theophylline (as well as caffeine, which is a related compound).
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.