Hunan Er-Kang Pharmaceutical Co., Ltd researches, develops, produces, and sells pharmaceutical excipients, APIs, and finished drugs in China and internationally. Its APIs include glycerin, dilute hydrochloric acid, dihydroxypropyl theophylline, sulbenicillin sodium, calamine powder, sulfadiazine, sulphaguanidine, TMP, and resorcinol. Finished drugs include sulbenicillin sodium for injection and compound liquorice tablets. The company also offers conventional excipients such as pharmaceutical glycerin, medicinal ethanol, medicinal propylene glycol, medicinal sodium hydroxide, and sucrose, as well as new excipients including hydroxypropyl starch empty capsules, hydroxypropyl starch soft capsules, and citrate products. Founded in 2003, it is based in Changsha, China.