in order to assess the dose/response ratio of two different doses of theophylline , the effects of two periods of 4-day treatment with 300 and 450 mg sustained release anhydrous theophylline ( theodur , astra , sweden ) b.i.d . in 16 in-patients with reversible chronic obstructive lung disease in a stable state were investigated in a double-blind randomized crossover study .
C0039771
theophylline
C0304441
anhydrous theophylline