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FDA warning letters

FDA’s formal notice that it found significant violations. Read what the agency cited, what it asked for and how quickly.
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What a warning letter is, and why it matters

A warning letter is FDA’s notice to a company that the agency believes it has found significant violations of federal requirements. It usually follows an inspection and a Form 483, after FDA has reviewed the firm’s response and found it inadequate, though letters also follow sample testing, website reviews and import examinations.

The letter lists each violation, often with the 21 CFR section, explains why the firm’s response fell short, and asks for a written reply within 15 working days describing corrections and how they will be prevented from recurring. Unresolved problems can lead to import alerts, seizures, injunctions or held approvals.

For buyers, investors and quality teams, a warning letter is a clear signal about a site’s compliance status, and the letter’s wording shows exactly where FDA drew the line.

What’s inside a warning letter

The parts you will find in almost every one, and what each tells you.

  1. Letterhead and reference

    The issuing FDA office, date, delivery method and the letter’s reference number.

  2. Addressee

    The firm and the senior person responsible, usually the CEO or site head.

  3. Basis for the letter

    The inspection dates, FEI and the 483 or review that led to it.

  4. Violations

    Each violation with its regulation, the evidence and FDA’s view of the response.

  5. What FDA asks

    The corrections expected, the 15-working-day reply and the consequences of not acting.

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Questions

What is an FDA warning letter?

A warning letter is FDA’s formal notice that it believes a company has significantly violated federal requirements. It asks the firm to respond in writing, usually within 15 working days, with corrections and preventive actions.

What is the difference between a 483 and a warning letter?

A 483 lists an investigator’s observations at the end of an inspection and is not a final decision. A warning letter is an agency-level action, issued after FDA reviews the evidence and the firm’s response.

How does a warning letter get closed?

After the firm corrects the violations and FDA verifies them, often through a follow-up inspection, FDA may issue a close-out letter.

Can a warning letter affect product approvals?

Yes. Unresolved violations can delay or block approvals, lead to import alerts and affect government contracts.

How much does a warning letter cost on FDA Intel?

$99 per letter, paid by card with no subscription. Your first Form 483 or letter is on us.

Check a supplier or competitor before you sign.

$99 per warning letter. Your first Form 483 or letter is on us.

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