sulfathiazole

noun

sul·​fa·​thi·​a·​zole

variants or chiefly British sulphathiazole

ˌsəl-fə-ˈthī-ə-ˌzōl 

: a sulfa drug C₉H₉N₃O₂S₂ derived from thiazole and sulfanilamide that is seldom prescribed because of its toxicity but was formerly used especially in the treatment of pneumococcus and staphylococcus infections