 Rohto Pharmaceutical Co. continued to acquire the management rights to The Mentholatum Company in June 1988, thus completing the merge.In October 1991, The Mentholatum Zhongshan Pharmaceuticals was founded in Zhongshan, Guangdong Province, China, as a joint venture company as well as the headquarters for Chinese expansion.In May 1996, Mentholatum's eye drops began local production and sales in China.