title: Oversaturation of urine with sulphadiazine during treatment with a small therapeutic dose.
abstract: The urinary crystallization of N1-pyrimid-2-yl-sulfanilamide (sulphadiazine, Sulfolex) during treatment with a small therapeutic dose (600 mg/day p.o.) for 6 days was evaluated in seven voluntary female subjects. In 5/7 and 3/7, respectively, of the urine supernatants obtained from samples collected 6 and 24 h after the last dose of sulphadiazine, the sulphonamide concentration exceeded the experimental solubility of the drug in 37 degrees C urine at the same pH. However, only in 3 sediments of the 6-h urine samples could a few sulphadiazine crystals be found. The findings suggest that the urine often can be oversaturated in respect to sulphadiazine, without any marked crystallization.
mesh_terms: D000328:Adult; D003460:Crystallization; D005260:Female; D006801:Humans; D008875:Middle Aged; D012995:Solubility; D013411:Sulfadiazine / Q000008:administration & dosage / Q000627:therapeutic use / Q000652:urine*; D013696:Temperature; D014552:Urinary Tract Infections / Q000188:drug therapy
chemical_list: D013411:Sulfadiazine