Comparator Sourcing

Clinical Trial
Comparator Drug
Sourcing UK

Euro Biom is an MHRA WDA-licensed wholesale distributor sourcing branded comparators and Reference Listed Drugs for the control arms of clinical trials. Verified provenance and single-batch supply of commercially packed UK-licensed product, subject to availability. Euro Biom trades exclusively in UK-licensed medicines.

MHRA WDA Licence No. WDA(H) 59239

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What is a Comparator Drug

The medicine in the
control arm.

A comparator drug is the medicine used to control the experimental arm of a clinical trial. The investigational product is measured against it for efficacy, safety or pharmacokinetic profile. Without a defensible comparator, the trial result has no benchmark.

Comparators take several forms. An active comparator is an approved drug already in clinical use for the same indication. A Reference Listed Drug (RLD) is the specific approved product against which generic and follow-on candidates must demonstrate equivalence under FDA, MHRA or EMA frameworks. A placebo serves as control in studies where no approved active treatment exists or where the protocol requires it.

In every case, the comparator must be the exact branded product specified by the protocol. Substitutions are not permitted without protocol amendment. This precision requirement is what makes comparator sourcing fundamentally different from commercial wholesale supply.

Active Comparator Reference Listed Drug Branded Comparator Single-Batch Supply

"A comparator is not a substitutable commodity. It is a specific batch of a specific brand from a specific origin, defined by protocol. Sourcing it is a regulated documentation exercise, not a procurement transaction."

Why Comparator Sourcing Is Hard

Six Reasons Comparator
Sourcing Is Hard

Commercial pharmaceutical wholesale is optimised for high-volume, recurring distribution. Clinical trial comparator demand is the opposite shape.

Small, Irregular Volumes

A trial may need 200 packs of one product across 18 months. Orders of that shape can be hard to place through routine wholesale channels.

Brand-Specific Requirements

The protocol names a single brand from a single country of origin. Generic substitution is not acceptable. Even minor differences in formulation, excipients or manufacturer site can invalidate the comparison and the trial.

Batch Consistency

Many protocols require a single batch across all trial sites or a tightly controlled set of batches with documented overlap. Sourcing must be planned around manufacturing campaigns, not pulled from rolling commercial stock.

Expiry Dating Across Trial Duration

A 36-month trial needs comparator with at least 36 months of remaining shelf life at the point of supply, plus contingency. Stock with three months expiry, fine for commercial use, is useless for trial supply.

Blinding and Packaging Demands

Blinded studies require over-encapsulation, matched placebo, label translation and randomised kit assembly, which are carried out by the sponsor's MIA(IMP) holder. Comparator sourcing must still be aligned to that schedule and supported by chain-of-custody documentation.

Provenance and Documentation

Sponsor regulatory inspections expect a documented chain from authorised manufacturer through licensed wholesale to the sponsor's licensed recipient. Grey-market or unverifiable sourcing creates inspection risk that can derail the entire study.

The Euro Biom Solution

Comparator sourcing
to the protocol specification.

We work to the specification in your brief, with GDP records for each supply.

Documented Provenance

Every comparator is sourced through the UK licensed supply chain: UK marketing authorisation holders and licensed UK wholesalers. We do not use grey-market channels or unauthorised intermediaries. Chain of custody records are provided for our part of the chain.

WDA(H) 59239 | GDP-licensed counterparties only

Single-Batch and Multi-Batch Sourcing

Whether the protocol calls for single-batch supply across all sites or a controlled set of batches with documented overlap, we plan the sourcing to match. We confirm batch availability with the manufacturer or licensed wholesaler before quoting, not after order placement.

Batch confirmation before quotation

Expiry Dating Aligned to Trial Duration

We ask suppliers for stock with the longest available expiry. For 24-month and 36-month studies, we confirm batch and expiry availability through UK marketing authorisation holders and licensed UK wholesalers at quotation.

Expiry dating confirmed at quotation

Supply to the Sponsor's Licensed Packager

Where the protocol requires over-encapsulation, matched placebo or randomised kit assembly, we deliver the comparator to the sponsor's nominated MHRA MIA(IMP)-licensed packaging partner. We deliver to the packager, the packager performs the licensed reconfiguration, and we maintain wholesale documentation throughout.

Delivery to the sponsor's licensed packager

Common Comparator Types

What We Source

Comparator demand falls into a small number of categories. Each has its own sourcing pattern.

Innovator Branded Comparators

The originator branded product still under patent protection or marketed by the originator. Used as the active control in head-to-head efficacy and safety studies. Typically the most demanding sourcing pattern because the originator may restrict commercial channels.

Reference Listed Drugs (RLDs)

The specific approved product designated by FDA, MHRA or EMA against which generic and follow-on candidates must demonstrate equivalence. RLD selection is regulator-defined and substitutions are not permitted.

⏳

Off-Patent Originals

Originator brands of off-patent molecules. Still required as comparators in some study designs, particularly in real-world evidence research and post-marketing surveillance. Sourcing depends on whether the originator continues to manufacture the brand.

Standard-of-Care Drugs

Established treatments used as the active control representing standard of care in the studied indication. The specific product may vary by region and protocol may name multiple acceptable variants.

Placebo Requirements

Where placebo is required, the sponsor arranges manufacture through its own MIA(IMP)-licensed partner. We supply the UK-licensed comparator only.

How It Works

From Brief to
Documented Delivery

A four-step process built for the documentation, traceability and timing demands of clinical research.

Step 01

Sourcing Brief

You send the comparator name, required country of origin, brand specification, total volume, per-site quantity, minimum expiry dating, target dates and any blinding or packaging requirements. We confirm feasibility within the working day.

Step 02

Verification

We identify the licensed sourcing route, confirm batch availability with the manufacturer or wholesaler, secure target expiry dating and document the chain. Quotation includes documentary evidence of provenance before order placement.

Step 03

Documentation

On confirmation we prepare the GDP documentation pack including the manufacturer batch documentation available for each line, chain of custody records, temperature records where applicable, and export documents.

Step 04

Blinded Packaging or Direct Supply

Where the sponsor requires blinded packaging, its own MIA(IMP) holder carries that out after receiving the commercially packed comparator. Supply is to recipients lawfully able to receive the product, with a documentation pack and temperature monitoring where required.

Where Comparator Demand Concentrates

Therapeutic Areas
We Cover Most Often

Comparator demand is heaviest where active research is most concentrated and where active-controlled trial designs are standard.

Oncology

Cytotoxics and oral targeted therapies used as active controls in head-to-head efficacy trials.

Immunology (small-molecule only)

Comparators used in autoimmune disease research, including reference products studied in rheumatoid arthritis, IBD and psoriasis trials.

Cardiovascular

Anticoagulants, novel oral anticoagulants, statins and antihypertensives used as active controls in cardiovascular outcome and safety studies.

CNS and Neurology

Antipsychotics, antidepressants, antiepileptics and oral MS therapies used as active comparators in CNS efficacy and switching trials.

Diabetes and Endocrinology

Oral antidiabetic agents and SGLT2 inhibitors used as comparators in head-to-head glycaemic control and weight outcome studies.

Rare Disease

Low-volume UK-licensed comparators for rare disease research, where commercially available.

Submit a Comparator Sourcing Brief

Send us the protocol-defined specification. We respond the same working day with the sourcing route and an indicative timeline.

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Frequently Asked Questions

Comparator Drug Sourcing, Explained

Common questions from clinical trial supply leads, sponsor regulatory teams and CRO sourcing managers.

What is a comparator drug in a clinical trial?

A comparator is the medicine in the control arm of a trial, used to measure the investigational treatment against. It can be an active control, a Reference Listed Drug for bioequivalence and follow-on equivalence work, or a placebo where no approved active treatment exists.

Why is comparator sourcing harder than commercial supply?

Trial volumes are small and irregular, the protocol specifies a single brand and country of origin, batches must be consistent across trial duration, expiry dating must cover the full study, and blinding may demand specialist packaging. Commercial wholesale is built for the opposite shape of demand.

Can you source discontinued or hard-to-find branded comparators?

Often, yes. Through UK marketing authorisation holders and licensed UK wholesalers we may be able to source some brands with limited supply. We never source from grey-market channels. If a product cannot be obtained compliantly, we tell you at the feasibility stage.

Do you provide blinded over-encapsulation or matched placebo?

Not ourselves. Over-encapsulation, matched placebo manufacture and blinded kit assembly are investigational medicinal product activities for an MHRA MIA(IMP)-licensed manufacturer. We source the UK-licensed comparator and deliver it to the sponsor's nominated licensed packager, who carries out those steps. Euro Biom retains the wholesale supply documentation throughout.

How is provenance verified?

Every comparator is traced from authorised manufacturer through licensed wholesale to Euro Biom. We provide chain of custody records for each supply, together with the manufacturer batch documentation available for each line, confirmed at quotation stage. Sourcing is restricted to MHRA-authorised and UK WDA-licensed counterparties.

What information do you need for a quote?

Comparator name (INN and brand), required country of origin, strength and dosage form, total volume, per-site quantity, minimum expiry dating, target delivery date, destination country and any blinding or packaging requirements. Protocol-extracted briefs accelerate response.

Related Resources

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