Oops, I guess only 14% of the population knows. :)
"Six distilleries were given permits to sell medicinal whiskey during Prohibition-A. Ph. Stitzel, Glenmore, Schenley, Brown-Forman, National Distillers and Frankfort Distilleries-and these companies were allowed to store whiskey and sell it to licensed druggists, who in turn could mete it out to customers who had a doctor's prescription."
http://www.prohibitionrepeal.com