sulfanilamide n a white odorless crystalline sulfa drug; the parent compound of most of the sulfa drugs Usage(s) Newest member of the rapidly growing sulfanilamide family is a little number called N dodecanoylsulfanilamide. Sulfanilamide tablets and injections work wonders with gonorrhea, meningitis and various streptococcic diseases. Only since February 1935 has the drug sulfanilamide been known.