You should be happy to know that Wikianswers is the only Q&A site with this answer :) Robitussin was invented some time in the 1950s by A. H. Robins. Here is more information about it: "By the early 1950s, A. H. Robins had added the cough medication Robitussin to its product line, and sales were taking off." [1] Enjoy!