About Us

The science-based clinical trial supply leader

Clinical Services International (CSI) is a world leader in the sourcing and management of quality certified commercially available medicines (comparators, concomitant medication, rescue medication) for clinical trials.

Headquartered in London and with operations in the UK, Germany, Japan and the USA, we provide efficient solutions and serve global trials. We are passionate about customer service, quality, innovation and making rapidly available safe medicines. Our long standing experience in intelligent sourcing and clinical trials enables us to provide custom made solutions to address the most complex requirements. We accelerate drug development and reduce timelines by providing a fully integrated service.



A strategic partner in Clinical Trial Supplies


25 years’ experience

In drug development and clinical trial supplies


Worldwide access

Sourcing from Europe, USA, Latin America, and Asia Pacific


95+ Manufacturers

We work directly with all big pharmaceuticals and generic manufacturers

CSI's Growth and Excellence


“It has been very beneficial working with the CSI team. They have excellent scientific expertise, clearly understood the challenge, and provided outstanding solution. Their global reach allowed us to tap into many markets. They are customer focused, result driven and we enjoyed working with them. Well done Team! .“

Leading Gene Therapy Biotechnology Company, Director of Drug Product, Formulation and Stability

“I am truly extremely pleased that CSI managed to achieve the purchasing and delivery milestones which one could say “mission impossible” considering the tight market situation and strict requirement to test a batch which lead to the needs to reserve stock for weeks. a very big thank you to csi team for going beyond. without you, we would be at a lost and not able to achieve the FPI milestone. “

Top 5 CRO, Director Clinical Trial Supplies

“Thank you both for high collaboration and pro-activity really appreciate.“

Leading pharmaceutical company
Our team

Our team has extensive experience in drug development

Our team has extensive experience in drug development, successful design and the execution of clinical trials. We therefore understand and appreciate the complexities involved in sourcing the most appropriate medication.

We use our science-based approach, operational expertise and global experience to effectively, ethically, and efficiently specify, source and supply comparators and devices.



Business Development Director, Germany

Pharmaceutical Sales and Marketing Associate - UK

Project Manager, Germany

Pharmaceutical Sales and Marketing Associate