SPL Set ID: 32b9780f-c46f-4e0f-9641-2cab60600e6e

Theophylline is structurally classified as a methylxanthine. It occurs as a white, odorless, crystalline powder with a bitter taste. Anhydrous theophylline has the chemical name 1H-Purine- 2,6-dione, 3,7-dihydro-1,3 -dimethyl-, and is represented by the following structural formula: The molecular formula of anhydrous theophylline is C 7 H 8 N 4 O 2 with a molecular weight of 180.17. Theophylline Oral Solution USP is available as a liquid intended for oral administration, containing 80 mg of theophylline anhydrous and 20% alcohol in each 15 mL (tablespoonful). Theophylline Oral Solution USP also contains the following inactive ingredients: citric acid, FD&C Red No. 40, FD&C Yellow No. 6, flavor, purified water and saccharin sodium. May contain sodium citrate for pH adjustment. Theophylline Oral Solution USP has a pH of 3.0 - 4.7. theophylline chemical structure