Heritage, the U.S. unit of Pune, India-based Emcure Pharmaceuticals, also makes tetracycline. The antibiotic was inexpensive until a shortage of raw ingredients caused two generics makers to leave the market. When Heritage introduced 500-mg capsules of tetracycline in 2013 for $9, it was more than 100 times the old price, according to price data from First Databank Inc. compiled by Bloomberg Intelligence. The prices are before discounts.