November 23, 1982 Establishment of Yuhan Cyanamid through a joint investment between Yuhan Corporation and American Cyanamid (equity ratio of 40:60) October 1984 Initiation of the manufacturing of products     January 1985 KGMP approval by the excellent drugs manufacturing and control policy     January 1990 Beginning of direct sales through the internal business organization     March 1998 Sales of 'Ozex' which is an innovating quinolone-group antibiotic     November 1994 Merge of American Cyanamid to American Home Products Corporation     February 1996 Beginning of direct sales of 'Premarin' which is a female hormone replacement therapeutic agent (joint selling with DaLim Pharmaceutical Company)     February 1997 Sales of 'Tazocin' which is an extensive antibiotic     May 1998 Sales of 'Efexor' which is the first anti-depression agent in the SNRI group     June 1998 Transfer of the main office from Seoul to Goonpo city (factory)     April 1999 Merger of Cyanamid Medical Instruments and Korea Cyanamid     July 1999 Beginning of direct sales of vaccine products in the Seoul district (joint selling with Dongshin Pharmaceutical Company)     November 1999 Sales of Premelle 2.5, 5/ Premelle Cycle 5' in which the fist naturally combined estrogen and progesterone are mixed     August 2000 Sales of 'Materna-beta' which is a composite nutrient for pregnant women and nursing mothers and 'Efexor XR' which is an anti-depression agent October 2001 Transfer of the main office from Goonpo City(factory) to Yeoksamdong Kangnam-gu     September 1, 2000 Change the trade name to Wyeth Korea, Inc.