Pseudoephedrine and guaifenesin urolithiasis: widening the differential diagnosis of radiolucent calculi on abdominal radiograph.
Song GY, Lockhart ME, Smith JK, Burns JR, Kenney PJ. Pseudoephedrine and guaifenesin urolithiasis: widening the differential diagnosis of radiolucent calculi on abdominal radiograph. Abdom Imaging. 2005 Sep-Oct; 30(5):644-6.