sulfa vs sulfa drug

sulfa

noun

  • A sulfonamide or sulfanilamide. 

adj

  • Of or containing sulfonamide or sulfanilamide. 

sulfa drug

noun

  • Any of a group of antibiotic drugs structurally related to sulphonamide, tending to be bacteriostatic rather than bacteriocidal. 

How often have the words sulfa and sulfa drug occurred in a corpus of books? (source: Google Ngram Viewer )