The 62-year-old drug is used to treat a condition called toxoplasmosis, which can be a life-threatening disease for pregnant women and people with compromised immune systems, such as those living with HIV or AIDS. The drug had been sold for $18 a pill by the company that previously held the rights to the drug. But when Turing, Shkreli's company, bought the medicine in 2015, it immediately hiked the price to $750 a pill — a move that some patient advocates calculated would bring the annual cost of treatment for a single person to hundreds of thousands of dollars, the Post reported.