Zhejiang Haisen Pharmaceutical Co., Ltd., together with its subsidiaries, engages in the research, development, production, and sale of pharmaceutical intermediates, active pharmaceutical ingredients, and preparations in China and internationally. The company offers active pharmaceutical ingredients for use as antilipemic agents, antipyretic analgesics, antidepressants, analgesics, antibacterial agents, histamine drugs, and anticonvulsants, as well as for anti-gastric ulcers, and digestive and cardiovascular applications. It also provides chemical products for use as paroxetine HCl and amikacin sulphate intermediates and food additives; and escitalopram oxalate tablets to treat depression and panic disorders under the Tezi brand. In addition, the company engages in the import and export of goods; trading; and medical research and experimental development activities. Zhejiang Haisen Pharmaceutical Co., Ltd. was incorporated in 1998 and is headquartered in Dongyang, China.