How to Choose an API Manufacturer in India: A Buyer's Checklist

Sourcing an API supplier is a longer-term commitment than most B2B purchases — a supplier change mid-formulation can mean re-validating your finished product. Here is a practical, non-generic checklist for evaluating any API manufacturer in India before you commit.

Sourcing an API manufacturer in India is a longer-term commitment than most B2B purchases. Here is a practical, non-generic checklist for evaluating one before you commit.

1. Confirm the manufacturing license and GMP status — don’t just take the badge at face value

Any Indian API manufacturer must hold a valid manufacturing license from their State Drug Control authority under CDSCO’s framework. “GMP” on a website can mean several different things:

• WHO-GMP — certified against World Health Organization Good Manufacturing Practice guidelines, the most common certification for Indian API exporters
• EU-GMP — required for supply into the European Union, a more stringent audit
• US FDA cGMP — required for US market supply, involves direct FDA inspection

Ask which specific certification the manufacturer holds, who issued it, and ask to see the certificate — not just a checkmark icon on a webpage. We cover this in more depth in our GMP compliance checklist for API buyers.

2. Ask about DMF or equivalent regulatory filing status

If you are sourcing for a regulated export market (US, EU or similar), ask whether the API has an active Drug Master File (US) or equivalent dossier (ASMF in the EU, CEP where applicable) already filed, or whether that filing would need to happen as part of your engagement. This materially changes your own regulatory timeline. See our plain-English guide to what a DMF actually is if this is new to you.

3. Request a real Certificate of Analysis (CoA), not a specification sheet

A specification sheet describes what the product should be. A CoA is the actual test result for the specific batch you are buying. Always ask whether a CoA is issued per batch as standard practice, and ask for a sample CoA before you order.

4. Ask for minimum order quantity (MOQ) and sample policy up front

MOQ and sample availability vary significantly by manufacturer and by compound. Get this in writing early in the conversation — it is one of the fastest ways to filter out suppliers who are not a practical fit for your order size.

5. Understand whether they manufacture or trade

Some “manufacturers” listed online are actually traders or aggregators reselling another company’s output. Ask directly: is this compound manufactured at your own facility, or sourced from a third party? This affects your ability to audit the actual manufacturing site and trace batch history. If it matters to your regulatory filing, ask to see the manufacturing facility directly.

6. Check export track record for your specific destination market

A manufacturer’s GMP status might be valid in India but not sufficient for your export destination. Ask specifically which markets they currently or have previously supplied to, and confirm scheduling / controlled-substance handling if your compound requires it (some APIs, like Pregabalin, carry controlled-substance status in certain markets — see our Pregabalin API page for an example of how that is documented).

7. Clarify whether you need a CMO or a CDMO relationship

If you already have a validated process, you want manufacturing capacity, not development work — and vice versa. This single distinction changes which page of a supplier’s site, and which conversation, you should actually be having. Read CDMO vs. CMO: what’s the real difference before your first supplier call.

The checklist, summarized

• Manufacturing license confirmed with the correct State Drug Control authority
• GMP certification type identified (WHO-GMP / EU-GMP / US FDA) and certificate seen, not assumed
• DMF or export-market-equivalent filing status confirmed
• Sample CoA requested and reviewed
• MOQ and sample policy confirmed in writing
• Manufacturer vs. trader status clarified
• Export track record confirmed for your specific destination market
• CMO vs. CDMO need correctly identified before the first call

Frequently asked questions

Is a lower price always a red flag for an API manufacturer? Not automatically, but it is a reason to verify certifications and CoA practice more carefully rather than less — price alone is not a quality signal in either direction.

How long does it typically take to onboard a new API supplier? This varies by compound, your own regulatory requirements, and whether documentation (DMF, CoA history) already exists — ask for a realistic timeline rather than assuming a standard figure.

Should I always request a sample before placing a bulk order? In most cases, yes — a supplier confident in their product should have a straightforward sample policy; a supplier without one is worth asking about directly.