Pharma grades explained: IP vs BP vs USP vs EP

Search for almost any common API or excipient and you will find offers labelled IP, BP, USP, EP, or a combination such as "IP/BP/USP". These letters refer to pharmacopoeias, the official books of quality standards for medicines. Knowing what each one is, how they differ and what a grade claim does and does not prove will help you buy the right material and avoid expensive rejections.

What a pharmacopoeia is#

A pharmacopoeia is a legally recognised compendium of quality standards for medicines and their ingredients. Its core is a set of monographs. Each monograph covers one substance or product and sets out:

• Definition and identity tests, such as infrared spectrum, HPLC retention time or specific chemical reactions
• Assay, the content of the substance, usually with limits such as 98.0 to 102.0 percent on a stated basis
• Tests for impurities, such as related substances, residual solvents and elemental impurities
• Other tests, such as water content, loss on drying, sulphated ash, pH or particle related properties

Monographs refer to general chapters for methods and to official reference standards for comparison. When a product is called "USP grade", the claim is that it meets every requirement of the current USP monograph for that substance when tested by the official methods.

The main pharmacopoeias#

Some other pharmacopoeias you will meet are the Chinese Pharmacopoeia (ChP) and the International Pharmacopoeia published by WHO.

A note on BP and EP#

The British Pharmacopoeia includes every monograph of the European Pharmacopoeia, plus national monographs, mainly for finished products. For a substance covered by a Ph. Eur. monograph, the BP and EP requirements are therefore the same text. That is why "BP/EP" is such a common dual claim.

USP and NF#

The USP covers drug substances and products, and the National Formulary covers excipients. They are published together. You will see "USP/NF" or just "NF" on excipients such as some grades of lactose, cellulose derivatives or stearic acid. USP also publishes the Food Chemicals Codex for food ingredients, which is separate from its drug standards.

How the grades differ in practice#

For many substances the monographs in different pharmacopoeias are similar, and a well made batch can pass all of them. But differences are common, and they are exactly where rejections come from:

• Different impurity limits. One pharmacopoeia may list specified impurities with individual limits while another uses a general limit.
• Different methods. HPLC conditions, system suitability or detection can differ, so the same sample can give slightly different results.
• Different tests. One monograph may include a test, such as a specific optical rotation or a particle size requirement, that another does not.
• Different reference standards. Each pharmacopoeia has its own official reference standards for its tests.
• Different update timing. Each pharmacopoeia revises its monographs on its own schedule. A product tested to an older edition may not meet a newer one.

Harmonisation is happening. The Pharmacopoeial Discussion Group works to harmonise selected excipient monographs and general chapters between the major pharmacopoeias, and international guidelines such as ICH Q3C for residual solvents and Q3D for elemental impurities have been adopted widely. Many monographs are still not harmonised, so check rather than assume.

What multi grade claims mean#

Indian and Chinese manufacturers often offer material as "IP/BP/USP" or "BP/EP/USP". This is legitimate when the batch has been tested against each monograph and meets all of them. It is a convenient way for a manufacturer to sell one product into many markets.

When you buy multi grade material, ask for:

1. A COA that reports results against the monograph you need, not only a combined summary. Some suppliers issue separate certificates per pharmacopoeia.
2. The edition used, or confirmation that it is the current edition.
3. Any tests that are only in your monograph, with their actual results.

A COA that says "complies with IP/BP/USP" with a single set of numbers and no methods is not enough for regulated use.

What a pharmacopoeia grade does not prove#

This is the most important point in this article. A pharmacopoeia grade claim is a statement about test results. It is not a statement about how or where the product was made.

For use in medicines, regulators expect APIs to be made under good manufacturing practice, following ICH Q7, at a site that the medicine maker has qualified and that may be inspected. They also expect the supplier to notify changes to the process. A product can pass every monograph test and still be unsuitable for pharmaceutical use if it was made in a plant without GMP controls.

So for pharmaceutical buyers, the grade is necessary but not sufficient. You will typically also need:

• evidence of GMP for the specific site, such as a GMP certificate, WHO-GMP certificate or inspection history
• a regulatory filing that you can reference, such as a US DMF, an EU ASMF or a CEP from the EDQM
• a quality agreement covering change control, complaints and audits
• for excipients, evidence of appropriate GMP for excipients, often based on IPEC guidance

For non pharmaceutical uses, such as a laboratory, an industrial process or animal health applications with their own rules, a pharmacopoeia grade can simply be a useful, well defined specification. Make sure the price premium is worth it for your application.

Pharma grade versus other grades#

You will often see the same substance offered in several grades. A rough guide to how they compare:

These are not simply "better" or "worse". A reagent grade chemical can be purer than a pharmacopoeia grade in some respects and still be unsuitable for medicines because it lacks GMP and regulatory support.

Practical tips for buyers#

• Name the pharmacopoeia and edition in your RFQ. "Paracetamol IP" and "paracetamol USP current edition" are different requests. Our guide to writing an RFQ has a template.
• Ask for a recent COA before you order and check it against the monograph. See what a certificate of analysis should contain.
• Test the first batches yourself or at an accredited lab using the official methods.
• Do not accept a grade upgrade by paperwork. A technical grade batch does not become USP grade because someone tested it once, unless it was made and controlled appropriately.
• Check regulatory documents with the issuer. Search CEPs in the EDQM database and check GMP certificates with the authority that issued them.

On CompoundList#

Every offer on CompoundList states its grade and purity, and paid members can attach COAs, TDS and other documents to their listings. When you send a request for quote, specify the pharmacopoeia and edition so every supplier quotes the same standard.