Shares of Affymax (NASDAQ:AFFY) plunged more than 85% in Monday midday trading after the company announced a recall of its anemia drug.

The company and its Japanese partner Takeda Pharmaceutical (PINK:TKPYY), voluntarily pulled the drug after reports indicated that 0.02% of 25,000 patients receiving Omontys had suffered extreme reactions and died, Reuters noted.

Other patients were reported to have experienced strong hypersensitivity reactions — including 19 reports of anaphylaxis — to the drug. Also known as peginesatide, the medication is designed to combat anemia in adults undergoing dialysis.

In November, the U.S. Food and Drug Administration stopped production of a generic version of the anti-cholesterol drug Lipitor made by

Ranbaxy Laboratories (PINK:RBXZF) after glass particles were found in some shipments.

Shares of Takeda Pharmaceutical fell more than 2% in over-the-counter trading.