57 of 59 inspected 503B facilities received a Form 483

Of the 59 facilities on the FDA's 503B register with an inspection date, 57 have a Form 483 recorded against that inspection and 2 do not.1 Read the number the right way round: it is not a claim that 96.6% of compounders are dangerous. A Form 483 is the document an investigator leaves at the end of an inspection listing what they observed. On this register, leaving one is the normal ending.

37 of the 59 inspections on the register happened in the last twelve months, and 35 of those produced a Form 483 — 94.6%, against 96.6% across the whole file.1 A finding rate that holds steady while the inspection count rises is the sign of a consistent standard being applied to more facilities, not of a crackdown.

A Form 483 is where an inspection ends, not where enforcement begins. The register's action column shows what happened next: 6 facilities have a warning letter recorded, 6 a regulatory meeting, and 5 an FMD-145 letter.1 40 are recorded simply as open. So of 57 facilities with observations against them, 17 — 29.8% — have a further action on the file.2 That gap is the distance between "an investigator wrote something down" and "the agency acted", and it is the reason a single 483 should never be quoted as a finding of wrongdoing.

Inspections on the file run from September 2024 to September 2026, distributed as 2024: 1, 2025: 31 and 2026: 27.1 The register carries one row per facility holding its most recent inspection, so an older inspection is overwritten rather than added. The median inspected facility was last seen 0.8 years ago. Any rate computed here is therefore a rate across current inspection records, not across every inspection the FDA has ever conducted.

The complete list, so the count can be checked rather than taken on trust. Names link to the page for that record where one is published.

The numerator and the denominator come out of the same two columns of one file. From the FDA's outsourcing facility register we take every row with a "Date of Last Inspection", which gives the denominator of 59; of those we count the rows where the register records a Form 483 issued.1 Facilities with no inspection date are excluded entirely — they are the subject of their own page, and including them here would produce a rate that measures inspection coverage rather than inspection findings.

We publish the rate this way round on purpose. An earlier version of this page counted 483s against the whole register, which sounds more alarming and says less: it moves whenever the FDA inspects more facilities, whatever the inspections find. The rate among inspected facilities is the number that holds still enough to mean something.

The escalation counts are read from the register's own free-text action column, matched case-insensitively on the phrases the FDA uses there. A facility with no text in that column is not counted as escalated.1

Each of these changes what the figure means. They are numbered so a quotation can name the one it breaks.

1. A Form 483 records an investigator’s observations. It is not a final FDA determination and not an enforcement action.
2. Most FDA inspections across all industries produce a Form 483, so a single 483 is routine. The rate is the story, not any one facility.
3. The register covers all 503B facilities, not only those compounding a GLP-1.