Theophylline (Theophylline) is a chemical substance widely found in black tea and green tea in nature.

Theophylline is a phosphodiesterase (PDE) inhibitor that can be widely used in the treatment of respiratory diseases.

Theophylline  has similar structural and pharmacological properties to . The main effects of theophyllineare: Relaxation of bronchial smooth muscles Strengthen myocardial contractions Accelerate heart rhythm Increase blood pressure Increase renal blood flow Some anti-inflammatory effects; Theophylline and many kinds of drugs (such as phenytoin antiepileptic drugs and cimetidine like antiulcer Drugs) have interactions, and care should be taken when using them.

Theophylline is mainly used in the treatment of chronic obstructive diseases of the airways, airway cholinergic nerve hyperfunction, chronic obstructive pulmonary diseases (COPD) and bronchial asthma.

Theophyllineis a bronchodilator. 

It helps open up the airways in yourlungs to make it easier to breathe. This medicine is used to treat thesymptoms of asthma, bronchitis, and emphysema.