Interthai Pharmaceuticals is a trusted CDMO partner delivering high-quality pharmaceutical contract development and manufacturing solutions in Thailand and across Southeast Asia.
As a member of the Zuellig Group, we combine global expertise with local agility to help our partners bring safe, effective, and compliant healthcare products to market.
With over 50 years of manufacturing and packaging experience, Interthai has established itself as one of Thailand’s most reliable pharmaceutical producers. Our integrated services cover formulation development, sourcing, production, packaging, and quality control — all under PIC/S GMP-compliant systems. We partner with leading multinational and regional pharmaceutical companies to deliver products that meet the highest international standards.
For over 100 years, we have built enduring partnerships and set new heights in quality and service excellence.
Founded in 1922 as F.E. Zuellig Inc. in the Philippines, the Zuellig Group has long been a trusted name in healthcare across Asia.
Established in Thailand in 1953 as part of the Group’s regional expansion, Interthai Pharmaceutical Manufacturing Limited has grown into a leading contract manufacturing and development partner for pharmaceutical and nutraceutical products.
Over the decades, we have continually invested in technology, facility upgrades, and process innovation to meet the evolving needs of our clients and uphold the highest quality standards.
Our history began 100 years ago when F.E. Zuellig Inc. was incorporated in the Philippines.
Establishment of a Drug Department specializing in the import and distribution of pharmaceuticals
Zuellig Group Pharma Industries established to provide manufacturing services to pharmaceutical companies
Incorporation of F.E. Zuellig (Bangkok) Ltd., expanding into Thailand
Rebranded as Interthai Pharmaceutical Manufacturing Ltd.
Expanded production for dietary supplements and traditional medicine
Implemented SAP system and warehouse modernization
Certified TGA-GMP by the Australia and New Zealand Authority, for Solid and Liquid lines
Upgraded purified water system and cleanroom facilities
Renovated sterile production area and increased capacity for liquids and semisolids
Certified Gold Award for Good Labor Practice (GLP) from the Department of Labor Protection and Welfare
Added cosmetics production capability
Certified ISO14064-1:2018 from Bureau Veritas
Certified ISO14001:2015 from SGS
A leading global partner in healthcare, delivering innovative solutions for better health.
Delighting customers through high quality products and exceptional service.
Building long-term partnerships through reliability and responsiveness
Acting with transparency, fairness, and respect
Working together to achieve shared goals
Operating responsibly for a healthier community
Committing to continuous improvement and regulatory excellence
Building long-term partnerships through reliability and responsiveness
Acting with transparency, fairness, and respect
Working together to achieve shared goals
Operating responsibly for a healthier community
Committing to continuous improvement and regulatory excellence
Our compliance team undergoes regular external audits by multinational clients and regulators to ensure adherence to the highest level of quality standards and regulatory compliance.
We have achieved the “Gold Award” for Good Practice in Occupational Safety and Health Management from the Department of Labour Protection and Welfare of Thailand.
We are accredited with internationally recognized certifications, such as:
A Strong Network within the Zuellig Group.
Interthai is part of the Zuellig Group, a diversified healthcare leader with over 12,000 employees across 13 markets in Asia.
