warning letter (FDA)
a formal, public FDA notice that the agency believes a company violated the law — a demand to correct, not a court finding, sitting above an untitled letter and below enforcement action.
a warning letter is the FDA saying "we believe this is illegal, fix it" — in public, with the company's name on it. it is neither a verdict nor a shrug, and coverage routinely treats it as both.
the ladder
FDA correspondence has rungs. An untitled letter flags concerns that do not meet the threshold for a warning letter. A warning letter is the formal step: it states violations, demands correction on a deadline, and is published. Above it sit seizures, injunctions, and criminal referral. A warning letter is an allegation with teeth — companies usually respond and correct — but it adjudicates nothing, which is why this site reports letters as letters, never as findings.
why the distinction earns a page
In September 2025 the FDA announced it was sending thousands of letters over drug advertising and roughly a hundred cease-and-desist letters at once. Whether any given letter alleged a real violation, and whether the ads actually changed, are separate questions from the announcement — the letter is the start of a process, not the end of one.
somewhere to put it
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questions
does a warning letter mean the company broke the law?
It means the FDA formally alleges so. Most letters end in correction rather than litigation, and courts — not letters — decide legal liability.
more from the glossary
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