Comparator Drug Sourcing for Clinical Trials: What Sponsors Should Expect From a Supplier
Comparator supply is where a trial buys the commercial drug it is testing against. This guide sets out what a sponsor or CRO should require from a comparator supplier: provenance, documentation, cold chain, and the ability to source across markets.
Why comparator sourcing is different from ordinary purchasing
In a head-to-head or active-control trial, the comparator arm uses a commercial medicine. The sponsor has to buy it, prove where it came from, keep it in condition, and be able to show every step of that history to an auditor years later. The product is ordinary; the documentation burden is not.
What to require from a comparator supplier
Provenance you can defend. Every unit should trace to a licensed manufacturer or authorized distributor, with the supplier's own licence covering wholesale and, where relevant, import. Ask for the supplier's establishment licence number and check it against the regulator's public register (in Canada, the Drug Establishment Licence register).
Batch-level documentation. Certificate of Analysis per lot, batch number and expiry, and a chain-of-custody record from the manufacturer or authorized distributor to your depot. If the trial is blinded, confirm the supplier can provide product in a form that supports blinding, or can coordinate with your packaging vendor.
Cold chain with evidence. Temperature-controlled storage and transport with continuous monitoring, and a temperature log delivered with the shipment — not just a statement that the product was kept cold.
Multi-market sourcing. Comparators are often unavailable, back-ordered, or export-restricted in the trial's own country. A supplier who can lawfully source the same molecule from Canada, the US, the UK, or the EU — and explain the regulatory basis for each — reduces the risk of a stalled arm.
Expiry runway. Trials run long. Ask for minimum remaining shelf life at delivery, and whether the supplier can stage repeat shipments from the same lot.
How Nexara approaches comparator supply
Nexara holds a Health Canada Drug Establishment Licence for wholesale and import, sources from licensed suppliers in regulated markets, and provides batch documentation, chain of custody and temperature records as standard. Our historical trial-supply work has concentrated on higher-value specialty molecules — oncology, rare disease and biologic comparators — where availability and provenance are hardest to guarantee.
What to send us for a fast answer
Molecule and strength, dosage form, total quantity and delivery schedule, trial countries, blinding requirements, minimum remaining shelf life, and the delivery depot. We will confirm sourcing options and lead times, and flag any market where export or supply restrictions apply.
Last reviewed September 2026.