药物信息为Theophylline Extended-Release Tablets: DESCRIPTION

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:

This product allows a 12-hour dosing interval for a majority of patients and a 24-hour dosing interval for selected patients (see DOSAGE AND ADMINISTRATION section for description of appropriate patient populations).

Each extended-release tablet for oral administration contains either 100 mg, 200 mg, 300 mg or 450 mg of anhydrous theophylline. Tablets also contain as inactive ingredients: hypromellose, anhydrous lactose, magnesium stearate and povidone.