How to report a GLP-1 problem to the FDA (MedWatch)

If you’ve had a serious reaction to a GLP-1, received a pen you think is counterfeit, or found a quality problem with your medication, you can report it directly to the FDA — and doing so helps the agency spot safety signals early. Here is what qualifies, what to have ready, and the three ways to file. This is general education, not medical advice; for a medical emergency, call 911 or seek care first, then report.

Verified Jul 2026 · re-checked quarterlyBy the GLP1Zoom editorial teamWe compare, we don’t sell

Consumers report drug problems to the FDA through its MedWatch program using Form 3500B (the consumer version; health professionals use Form 3500). You can file three ways: online through the MedWatch portal, by phone at 1-800-FDA-1088, or by mailing the completed 3500B form. Report serious side effects, a suspected counterfeit or defective pen, or a product-quality problem. Before you file, gather the product details — name, strength, NDC number, and lot number — plus the dates you started and stopped, and a description of what happened. Reporting to the FDA does not replace telling your own doctor, and it’s also worth reporting to the manufacturer.

Key takeaways

Consumers use FDA Form 3500B (the plain-language patient version); health professionals use Form 3500. Same MedWatch program, different form.
Three ways to file: online at the MedWatch portal, by phone at 1-800-FDA-1088, or by mailing the paper 3500B form.
Report serious side effects, a suspected counterfeit or a defective/leaking pen, or any product-quality problem (wrong color, particles, broken device).
Have this ready: the drug name and strength, the NDC number, the lot number, the dates you started and stopped, and a clear description of what happened.
MedWatch is voluntary and it does not diagnose or treat you — tell your own prescriber about a serious reaction, and for an emergency get medical care first, then report.

Three ways to file a MedWatch report

Method	How	Best for
Online	FDA MedWatch online reporting portal (Form 3500B)	Most people — guided, saves your entries
Phone	Call 1-800-FDA-1088 (1-800-332-1088)	If you’d rather talk it through
Mail / fax	Download and complete Form 3500B, then mail or fax it	No internet, or attaching documents

What you can report

MedWatch is for problems with FDA-regulated products, including prescription drugs like GLP-1s. You don’t need to be certain the drug caused the problem — a reasonable suspicion is enough, and FDA would rather see a report than miss a signal.

Serious side effects — a reaction that led to hospitalization, was life-threatening, caused lasting harm, or otherwise worried you or your clinician.
A suspected counterfeit pen — wrong labeling, a lot number on the FDA counterfeit list, or a pen that doesn’t look or work right.
A product-quality problem — a leaking, cracked, or defective pen; particles or discoloration in the liquid; a device that won’t set a dose.
A therapeutic failure that you suspect is a quality issue — for example, no effect from a pen you believe may be counterfeit or degraded.

What to gather before you file

A report is far more useful — and faster to file — if you have the product details in front of you. Most are printed on the carton and the pen label.

The drug name and strength (for example, "Ozempic 1 mg").
The NDC number (the National Drug Code, printed on the carton).
The lot number and, if you can find it, the serial number.
The dates you started and stopped the medication, and the dose you were taking.
A description of what happened, when it started, and what you did about it.
The pharmacy or source it came from — especially important for a suspected counterfeit.

After you file — and who else to tell

MedWatch is one channel, not the only one. FDA reviews reports to detect safety patterns; it will not contact you with medical advice. So pair your report with the people who can actually act on your situation.

Tell your own prescriber about any serious reaction — they manage your care and can adjust or stop the medication. Report a suspected counterfeit or defect to the manufacturer too (for Ozempic, Novo Nordisk Customer Care is 1-800-727-6500), and tell the pharmacy that dispensed it so they can check their stock. If you were financially scammed by a fake online seller, that’s a separate report to the FTC at ReportFraud.ftc.gov.

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Common questions about How to report a GLP-1 problem to the FDA (MedWatch)

Which form do I use — 3500 or 3500B?

As a patient or caregiver, use Form 3500B — it’s the consumer version, written in plain language. Form 3500 is the version for health professionals. Both go to the same FDA MedWatch program; you just want the "B" form. If you file online through the MedWatch consumer portal, it walks you through the 3500B automatically.

Do I have to be sure the drug caused the problem?

No. You do not need to prove causation to file a MedWatch report — a reasonable suspicion is enough. FDA relies on these reports to detect safety patterns across many people, so it is better to report something you’re unsure about than to stay silent. Just describe what happened as clearly as you can.

Is reporting to the FDA the same as telling my doctor?

No — they’re different and you should do both. A MedWatch report goes to the FDA to help monitor drug safety nationally; the FDA will not respond with medical advice or manage your care. Your own prescriber is who can actually evaluate you, adjust your dose, or stop the drug. For a serious or emergency reaction, get medical care first, then file the report.

How do I report a fake pen versus a bad reaction?

Both go through MedWatch, but include different details. For a bad reaction, focus on symptoms, timing, and the dates and dose. For a suspected counterfeit or defect, focus on the product — the lot and serial numbers, the NDC, where you bought it, and what looks wrong. For a suspected counterfeit, also call Novo Nordisk at 1-800-727-6500 (for Ozempic) and tell the dispensing pharmacy. See our guide on spotting a counterfeit Ozempic pen.

Sources

Last reviewed 2026-07-24.

How to report a GLP-1 problem to the FDA (MedWatch)

Method

How

Best for

Online

FDA MedWatch online reporting portal (Form 3500B)

Most people — guided, saves your entries

Phone

Call 1-800-FDA-1088 (1-800-332-1088)

If you’d rather talk it through

Mail / fax

Download and complete Form 3500B, then mail or fax it

No internet, or attaching documents

What you can report

Serious side effects — a reaction that led to hospitalization, was life-threatening, caused lasting harm, or otherwise worried you or your clinician.

A suspected counterfeit pen — wrong labeling, a lot number on the FDA counterfeit list, or a pen that doesn’t look or work right.

A product-quality problem — a leaking, cracked, or defective pen; particles or discoloration in the liquid; a device that won’t set a dose.

A therapeutic failure that you suspect is a quality issue — for example, no effect from a pen you believe may be counterfeit or degraded.

What to gather before you file

A report is far more useful — and faster to file — if you have the product details in front of you. Most are printed on the carton and the pen label.

The drug name and strength (for example, "Ozempic 1 mg").

The NDC number (the National Drug Code, printed on the carton).

The lot number and, if you can find it, the serial number.

The dates you started and stopped the medication, and the dose you were taking.

A description of what happened, when it started, and what you did about it.

The pharmacy or source it came from — especially important for a suspected counterfeit.

After you file — and who else to tell