About Us

About Us

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.


25+ years' experience in drug development and clinical trial supplies

Worldwide Access

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

Relationships with manufacturers

95 manufacturers; we work directly with all big Pharmaceuticals and Generic Manufacturers

Headquartered in London and with operations in the UK, Germany, and the USA, we provide efficient solutions and serve global trials.

We are not a pharmaceutical wholesaler: We are CSI: the science-based clinical trial supply leader.

We are passionate about customer service, quality, innovation, and making rapidly available safe medicines.

Our longstanding 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.

Our Clients

Proud supplier to top 10 Pharmaceuticals and leading Biotechnology Companies

Partner of choice to 5 top CROs.

Partner of choice to leading Global Contract Manufacturing Organisations (CMO)


Here is what our clients have to say…