Tenax Therapeutics is a pharmaceutical company based in Morrisville, North Carolina that specializes in developing and selling treatment products for cardiovascular and pulmonary diseases in the US and Canada. The company has created three products for such diseases, TNX-103, TNX-102 (levosimendan), and TNX-201 (imatinib), with the first two having completed phase II clinical trials. It was previously called Oxygen Biotherapeutics, Inc., and it has been in operation since 1967.