title: Spontaneous dissolution of a guaifenesin stone.
abstract: Guaifenesin is a commonly used expectorant whose use may lead to the occasional formation of guaifenesin urinary stones. We herein describe a patient who was taking 2400 mg Guaifenesin per day as part of his treatment for asthma. He had a past history of a guaifenesin stone removed ureteroscopically. His current presentation was with a 9 mm by 6 mm stone in the upper left ureter, seen on CT scan, and treated initially with a ureteral stent and hydration. After 3 weeks, the stone had disappeared, as confirmed by repeat CT scan. The genesis and treatment of guaifenesin stones is discussed.
authors.affiliation: Department of Urology, University of Iowa, Iowa City, IA 52242-1089, USA.
authors.forename: Thai T
authors.initials: TT
authors.lastname: Nguyen
authors.forename: Bernard
authors.initials: B
authors.lastname: Fallon
authors.forename: Howard N
authors.initials: HN
authors.lastname: Winfield
mesh_terms: D000328:Adult; D001249:Asthma / Q000188:drug therapy; D005100:Expectorants / Q000009:adverse effects*; D006140:Guaifenesin / Q000009:adverse effects*; D006801:Humans; D008297:Male; D012075:Remission, Spontaneous; D014545:Urinary Calculi / Q000139:chemically induced*
chemical_list: D005100:Expectorants; D006140:Guaifenesin