In the late 1960s, the Zuellig Group put-up a pharmaceutical manufacturing facility to complement  its service in the healthcare industry in the Philippines. Eventually it spun-off and grew this business by incorporating Interphil Laboratories, Inc. in 1975. It then expanded to Thailand and formed Interthai Pharmaceuticals Manufacturing, Inc. in 1984.

INTERTHAI Pharmaceutical Manufacturing Ltd is an 8,000-square meter plant facility in Jatuchak, Bangkok, Thailand doing the same business as Interphil. It also provides research and development services including support for bioequivalent and bioavailability studies. Interthai is certified with the same top quality standards as Interphil.

ZUELLIG PHARMA has established itself as the leading healthcare distribution solution specialist in the region. Serving 15 countries and regions in Asia, it is constantly evolving its quality services, IT systems, facilities, and management in order to create enduring market partnerships based on trust, open communication, responsiveness, innovation, and top results.