Sourcing bulk piperacillin-tazobactam from China

Zero duty on qualifying bulk medicinal mixtures

Read from the UK Trade Tariff on 24 November 2026, heading 3003 covers mixed medicaments for therapeutic or prophylactic use, without measured doses or retail packaging. Bulk piperacillin-tazobactam medicinal mixtures fall within the penicillin-containing description, subject to confirmation of composition, presentation and intended use. The table describes purchasing forms covered by the same tariff line.

The supplied tariff record gives 3003 10 00 00 a duty rate of 0% for goods from China, with no anti-dumping or countervailing duty, suspension or attached tariff control. This tariff entry does not replace medicines licensing. For human medicinal products imported from China, confirm with the MHRA whether a manufacturer's licence covering importation and qualified person batch release apply, and consult our published medicines guidance when planning the shipment.

Confirm the commodity code using the full formula and packaging details. Measured-dose or retail-packed medicines belong in heading 3004. For the wider heading context, see bulk amoxicillin-clavulanate mixtures.

Specify the blend and manufacturing stage

State the chemical form of piperacillin and tazobactam, their target ratio, and whether assay results are expressed on an anhydrous or as-received basis. Agree identity tests, individual assays, related substances, water content, blend uniformity and particle size. Define whether the material is sterile or requires further processing, and agree the corresponding microbiological tests.

Ask the regulatory lead to establish whether the shipment is a medicinal product or an active-substance starting material. UK businesses importing active substances must register with the MHRA. Do not assume the customs heading settles that distinction. For the medicinal-product route, settle import licensing and batch certification; establish the marketing authorisation route before selling a finished human medicine.

Agree the actual manufacturing site, batch documents, container liners, seals, storage conditions and retest date before ordering. Good manufacturing practice is the minimum production standard for medicines manufacturers. Use factory verification to check the proposed producer and the documents it can supply.

Worked duty example

Illustrative example, not a quote: Illustrative only: 500 kg of bulk piperacillin-tazobactam medicinal mixture under 3003 10 00 00, invoiced at £30,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £31,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £31,500, so it is £6,300. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Identity and composition: arrange representative sampling and independent testing of both components, their ratio and the agreed assay basis.

Quality: check related substances, water content and uniformity against the purchase specification; assess sterility or microbial results according to the agreed processing stage.

Documents: match the manufacturing site, batch identifiers, analysis certificate, retest date and container labels; check the documents needed by the licensed importer for batch release.

Containers and transport: inspect liners, seals, moisture ingress and evidence of damage; review transport records against the agreed storage conditions before accepting the batch.

What goes wrong

A blend can meet a combined assay figure while the individual components or their ratio miss the specification. Results also become difficult to compare when the supplier and buyer use different moisture corrections. Require separate component results and an agreed calculation basis. Investigate damaged liners, clumping or unexplained changes in appearance before accepting material.

Another failure is ordering a bulk blend before the importer has settled its regulatory status, licence route and release documents. Ask the MHRA to confirm which documents and release steps are needed beyond a supplier's analysis certificate. Keep unresolved batches segregated while the responsible quality team reviews them, and use the inspection guide to define purchasing checks.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.