Theophylline is a medication commonly used to treat respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD). It works by relaxing the muscles in the airways, improving breathing and reducing inflammation. There are several synonyms for theophylline, including aminophylline, dyphylline, and oxtriphylline. These drugs have similar mechanisms of action and are used to treat the same respiratory conditions. However, they may differ in their strength, dosages, and side effects. It is important to consult with a healthcare provider before taking any medication, including theophylline and its synonyms, to ensure safe and effective treatment.