This medicine often is used to correct irregular heartbeat. Brand names of quinidine include Quinalan and Quiniglute. This medicine eases breathing difficulties associated with emphysema, bronchitis, and bronchial asthma. The medicine works by relaxing the muscles of the respiratory tract, which allows an easier flow of air into the lungs. Examples of brand names include Theo-Dur, Theophyl, and Bronkodyl.
Theophylline can also cause irritabilty, restlessness and can precipitate cardiac arrhythmia.
It's suggested that people taking it have periodic blood levels checked. Vitamins Vitamins serve as nutritional supplements in people with poor diets, in people recovering from surgery, or in people with special health problems. Others, such as vitamin C and iron, can cause ulcers if they become lodged in the esophagus when swallowed. Again, this list is not inclusive and the information is general in nature. Simply because a class of medicine is not on this list, that doesn't mean it can't cause potential problems.