Tenax Therapeutics, Inc., a clinical-stage pharmaceutical company, develops novel cardiopulmonary therapies in the United States. It develops TNX-101, TNX-102, and TNX-103 (levosimendan) that have completed phase II clinical trials for the treatment of patients with pulmonary hypertension in heart failure with preserved ejection fraction and associated pulmonary hypertension; and TNX-201 (imatinib), a tyrosine kinase inhibitor for the treatment of chronic myeloid leukemia. The company was formerly known as Oxygen Biotherapeutics, Inc. and changed its name to Tenax Therapeutics, Inc.