# Ratanajamit C, Skriver MV, Norgaard M, Jepsen P, Schonheyder HC, Sorensen HT: Adverse pregnancy outcome in users of sulfamethizole during pregnancy: a population-based observational study. J Antimicrob Chemother. 2003 Nov;52(5):837-41. Epub 2003 Sep 30. "Pubmed":http://www.ncbi.nlm.nih.gov/pubmed/14519675 # Kerrn MB, Frimodt-Moller N, Espersen F: Effects of sulfamethizole and amdinocillin against Escherichia coli strains (with various susceptibilities) in an ascending urinary tract infection mouse model. Antimicrob Agents Chemother. 2003 Mar;47(3):1002-9. "Pubmed":http://www.ncbi.nlm.nih.gov/pubmed/12604534 # Watanabe H, Hastings JW: Inhibition of bioluminescence in Photobacterium phosphoreum by sulfamethizole and its stimulation by thymine. Biochim Biophys Acta. 1990 Jun 26;1017(3):229-34. "Pubmed":http://www.ncbi.nlm.nih.gov/pubmed/2372557 (en)
Sulfamethizole is a competitive inhibitor of bacterial enzyme dihydropteroate synthetase. The normal para-aminobenzoic acid (PABA) substrate is prevented from binding. The inhibited reaction is necessary in these organisms for the synthesis of folic acid. (en)