By the PharmaTradz BD Team. Published October 2026.
In pharmaceutical manufacturing, a batch and a lot mean essentially the same thing: a specific quantity of a medicine or ingredient made in one defined process run, so that it is uniform within set limits. The batch number, or lot number, is the code that identifies it. That single code links a box on a pharmacy shelf back to the exact raw materials, equipment, people, test results and release decision behind it, which is why every regulator in the world insists on it.
The two terms are used interchangeably in most companies and in ICH guidelines. US regulations draw a fine distinction, explained below, but for most buyers the important question is not what the code is called, but whether it can be traced.
The formal definitions
ICH Q7, the GMP guideline for APIs, defines a batch (or lot) as a specific quantity of material produced in a process or series of processes so that it is expected to be homogeneous within specified limits. US regulations (21 CFR 210.3) define a batch in similar terms and a lot as a batch, or a specific identified portion of a batch, with uniform character and quality. In other words, a lot can be the whole batch or an identified part of it, for example one of several packaging runs from the same bulk. For continuous manufacturing, a lot can also be defined as the amount produced in a set period of time.
What a batch number tells you
The format varies between manufacturers. Many codes combine a product or site code, the year and a running number, but there is no universal standard, so do not try to decode a supplier's batch number without asking. What matters is what the number connects to inside the manufacturer's records: the batch manufacturing record, the packaging record, the raw-material batches used, any deviations, the laboratory results summarised on the Certificate of Analysis and the quality release decision.
On the pack, the batch number appears with the expiry date and, in markets such as India, the manufacturing date. On shipping documents, it should appear on the commercial invoice, the packing list and the Certificate of Analysis, and all of them should match.
Batch numbers, serial numbers and barcodes
A batch number identifies a whole production run. A serial number identifies a single pack. Serialisation systems such as the EU's Falsified Medicines Directive and the US Drug Supply Chain Security Act add a unique serial number, together with the product code, batch number and expiry date, in a 2D barcode on each pack, so individual packs can be verified. India requires QR codes on APIs, and since August 2023 barcodes or QR codes on the labels of 300 top-selling formulation brands listed in Schedule H2. If you export to a serialised market, your manufacturer must be able to print, record and upload these codes, which our page on pharmaceutical contract packaging covers in more detail.
Why traceability matters so much
When something goes wrong, such as a complaint, an out-of-specification result or a contamination scare, the batch number is what allows a manufacturer and its distributors to recall exactly the affected product rather than everything on the market. Good batch records also let regulators check, years later, how a particular batch was made and tested.
For importers and distributors, that means keeping records of which batch went to which customer. Most Good Distribution Practice rules require it, and it is the difference between a targeted recall and a costly withdrawal of all stock.
What buyers should check
Make sure the batch numbers match across every document and on the goods themselves. A Certificate of Analysis for a different batch from the one delivered is a classic red flag; our explainer on reading a Certificate of Analysis goes through the others.
Check the remaining shelf life for each batch on arrival against what your contract or tender requires.
Ask how many batches a shipment will contain. Several small batches in one order mean several CoAs to review and, in some markets, several release tests.
And keep your own distribution records by batch, so you can act quickly if a recall ever reaches you. Our guide to starting a pharmaceutical import business covers the other compliance basics.
More explainers
Related terms buyers ask about: immediate, extended, delayed and controlled release, fixed-dose combinations (FDCs), small molecules versus biologics and what an excipient is. For supplier documents, see what a DMF is and how to read a Certificate of Analysis.
How PharmaTradz can help
We ask manufacturers for batch-specific documents before shipment, so the CoA, invoice and packing list can be checked against each other. Our documentation and quality pack brings them together, or you can send us an RFQ to start sourcing.
Frequently Asked Questions(FAQs)
Is a lot number the same as a batch number?
In pharmaceutical practice, essentially yes. ICH guidelines treat batch and lot as the same thing. US regulations allow a lot to be either a whole batch or an identified portion of one.
What does a batch number on a medicine mean?
It identifies the specific production run the pack came from, and links it to the manufacturer's records of materials, equipment, tests and release for that run.
What is the difference between a batch number and a serial number?
A batch number covers a whole production run. A serial number is unique to a single pack, used in serialisation systems such as the EU Falsified Medicines Directive and the US DSCSA.
Why do batch numbers need to match on shipping documents?
Matching batch numbers on the invoice, packing list, Certificate of Analysis and goods prove that the test results you received belong to the product you received.
How are batch numbers used in a recall?
They let the manufacturer and distributors identify and withdraw exactly the affected batches, rather than all stock of the product, using batch-level distribution records.
