A box arrives from a pharmacy, and the printing on the vial or the pen inside it is not what you were expecting: an ingredient name you have not seen before, a pharmacy you have not heard of, a strength written a way nobody mentioned. Two parties made the decisions that ended in that printing — the physician who wrote the prescription and the pharmacy that filled it — and neither of them is standing next to you.
Some of what you are reading is ordinary and some of it is a reason to put the box down. Sort them apart before you use anything.
Put the box down and ask first. A label is the pharmacy's own record of what it made and shipped, so a difference on it is a question about the product rather than a packaging quirk, and a few of those questions have answers that end the matter without a second call.
What you are looking at on that label
What you are looking at on that label is four separate claims: the active ingredient, the pharmacy that made or dispensed it, the strength, and the lot and expiration printed on the carton. Each comes from a different step, and each is checkable on its own.
The ingredient line is the one that changes what is inside the vial. Semaglutide sodium and semaglutide acetate are different active ingredients from the ones in the approved drugs. Read the ingredient name to the end: the word sodium or acetate after it is not a printing convention.
The pharmacy name is checkable in a different way. Fraudulent compounded products circulating in the United States carry labels naming a compounding pharmacy that does not exist, and others name a real licensed pharmacy that did not make what is in the vial. A safe pharmacy is licensed with a state board of pharmacy and always requires a prescription. FDA publishes a link to every state board's license database: pick your state, search the name printed on your label, and if the pharmacy is not listed, do not use it.
The lot number and the serial number are what a counterfeit alert is written against. One current FDA alert names a lot number and the first eight digits of a serial number and asks patients and pharmacies to check the cartons they already hold against it. Both numbers are on the outside of the box.
Which differences are a reason not to use it
Put the box down for any of these: sodium or acetate in the ingredient name, a pharmacy you cannot find a license for, a package that arrived damaged or warm, or a lot or serial number matching a counterfeit alert. The rest of what you noticed is a reason to ask.
Warm is the one people talk themselves out of. Injectable medicines in this class need refrigerating as their package inserts direct, and compounded products have arrived warm, or with too little ice to hold that temperature. A box that was warm when you opened it goes back to the pharmacy rather than into your refrigerator — and if you are still deciding between a weekly injection and a tablet, cold-chain shipping is one of the differences that decides it.
Damaged packaging, labeling in a language you cannot read, a missing expiration date and an expired one are warning signs of an unsafe online pharmacy, alongside a site that ships without a prescription and one whose prices seem too good to be true. Any one of them is a reason to call the pharmacy before you open anything.
The counterfeit case is narrower. Counterfeit units of a branded injection have reached the American supply chain, and the needles found with them could not be confirmed sterile, which raises the risk of infection for anyone who uses one. You check that one against printed numbers, not against how the pen looks.
If you have already injected something you now doubt, the reaction to watch for is an allergic one. Go to an emergency room or call 911 for difficulty breathing, wheezing, swelling of the face, eyes or tongue, trouble swallowing, hives, dizziness or slurred speech. Anything else that starts afterward and is getting worse is a same-day call to your prescriber.
The two calls, and what to ask on each
Make two calls, and make the pharmacy's first: the pharmacy printed on the label, then the physician who wrote the prescription. Both need to hear the ingredient name exactly as printed, including anything after it.
Ask the pharmacy to read back what it dispensed against what was prescribed — the ingredient as written, the strength as written, the lot on the carton — and to say who made the product if the pharmacy on the label did not. Ask what temperature it shipped at, and what the pharmacy wants done with a package that arrived warm. Send a photograph of the label rather than describing it down the phone.
Ask the prescriber a narrower question: is this what you intended, and do I start it. A physician who wrote for one thing and is shown another can answer that in a sentence, and that answer is what decides whether the box gets opened.
If the pharmacy is one you cannot verify, or the product reached you without a prescription being written at all, report it. Patients and clinicians can report a quality problem or an adverse event to FDA's MedWatch program, and a suspected counterfeit goes the same way.
One thing belongs on the call with the prescriber whether or not the box turns out to be right. The approved semaglutide label directs that the medicine be stopped when a pregnancy is recognized and stopped at least two months before a planned one, and leaves breastfeeding to a decision made with your clinician. The approved tirzepatide label tells people using oral hormonal contraception to switch to a non-oral method or add a barrier method for four weeks after starting and for four weeks after each increase. Ask how each applies to what you have actually been sent.
Before anything is opened
- Photograph the label and the carton, including the lot and expiration, before anything is opened.
- Read the ingredient name to the end and check whether it ends in sodium or acetate.
- Search the pharmacy name on the label in your state board of pharmacy's license lookup.
- Compare your lot and serial numbers against the current counterfeit alert.
- Call the pharmacy, then the prescriber. Use nothing until one of them explains the difference.
- Keep the carton and the product rather than throwing them out — a report is easier while you still have the numbers.
Everything above is checkable by anyone holding the carton. What is not is the comparison against your own prescription, and that belongs to the pharmacy and to the physician who wrote it. Medicine that arrives by mail saves you the trip to collect it and costs you the person who would otherwise be standing there to read the label with you — which is what the two calls replace. If the pharmacy cannot tell you who made the product, stop waiting for a better answer and call the prescriber.
