THEOLAIR™-SR 3M Pharmaceuticals Theophylline Bronchodilator   Availability And Storage: 250 mg: Each white, round, sustained-release tablet, "3M" imprint on one face, "SR-250" bisect score on the other face, contains: theophylline (anhydrous) 250 mg. Nonmedicinal ingredients: cellulose acetate phthalate, lactose and magnesium stearate. Tartrazine-free. Bottles of 100. 300 mg: Each white, oval-shaped, sustained-release tablet, "3M" imprint on one face, "SR-300" bisect bar on the other face, contains: theophylline (anhydrous) 300 mg. Nonmedicinal ingredients: cellulose acetate phthalate, lactose and magnesium stearate. Tartrazine-free. Bottles of 100.