title: Letter: Anhydrous theophylline equivalence of commercial theophylline formulations.
mesh_terms: D000628:Aminophylline; D001702:Biopharmaceutics; D004304:Dosage Forms; D013806:Theophylline; D013810:Therapeutic Equivalency
chemical_list: D004304:Dosage Forms; D000628:Aminophylline; D013806:Theophylline