A PDUFA date is the deadline by which the FDA must make a decision on a drug approval application. PDUFA stands for Prescription Drug User Fee Act, a 1992 law that lets the FDA collect fees from drug makers to fund faster reviews. The date is set when the FDA accepts an application for review and is typically 10 months out for standard review or 6 months for priority review.
What Is a PDUFA Date?
The FDA deadline that can move biotech stocks 20% in a single day.

A small-cap biotech with one drug in the pipeline might move 30-50% on PDUFA day.
The PDUFA date is not a guarantee of approval—it's a decision deadline. The FDA can approve, reject, or request more data by that date. For investors, it matters enormously because biotech companies often have their entire valuation riding on a single drug candidate, and the PDUFA date is when the market finds out if that bet pays off.
How it works in practice
When a biotech company submits a New Drug Application (NDA) or Biologics License Application (BLA) to the FDA, the agency assigns a PDUFA date within days. That date becomes a hard stop on the FDA's review clock. The company knows exactly when a yes-or-no answer is coming. Investors mark their calendars.
On PDUFA date, the FDA issues a decision letter. An "approval" letter means the drug can be sold. A "complete response letter" (CRL) means the FDA wants more data, more trials, or manufacturing changes—back to the drawing board, sometimes for another 12+ months. A "refuse to file" is rare but means the application was incomplete from the start.
Why this matters to stock prices
A PDUFA date is a binary event. There's no middle ground. The stock either gets good news or bad news on a specific day. Biotech stocks often trade on hope and hype leading up to the date, then crater or spike on the actual decision. A small-cap biotech with one drug in the pipeline might move 30-50% on PDUFA day.
Large pharma companies with diversified pipelines feel PDUFA dates less acutely, but a blockbuster drug approval can still move the needle. Investors who own biotech ahead of a PDUFA date are betting on approval; those who short it are betting on rejection or delay.
The calendar as a trading tool
Serious biotech investors track PDUFA dates the way sports bettors track game schedules. Websites like BiopharmGuy and the FDA's own CDER database list upcoming PDUFA dates by month. Knowing which companies have catalysts coming—and when—lets you size positions and manage risk around known volatility events.
The PDUFA date is also a forcing function for management. If a company's lead drug gets a CRL instead of approval, the stock often drops 40-60% in a day. That's why biotech CEOs spend months before PDUFA dates preparing for both outcomes and sometimes pre-announcing data to soften the blow if results are weak.
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