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Theophylline is a "methylxanthine." This is a chemical that relaxes smooth muscle around the airways of the lungs. It also may act in other ways to help open the airways. There are other methylxanthines such as caffeine and theobromine. They are found in coffee, tea, and chocolate/cocoa, but they are not as strong as theophylline.
Download PDF: Theophylline: Questions and Answers
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