Library fact dates September 17 and 26, 2026.
The exact product sets the risk questions
Ask about the medicine in front of you, how it was prepared and whom to reach if something goes wrong.
Preparation is part of the discussion
FDA is the federal medicines agency, formally the U.S. Food and Drug Administration.
Compounding means preparing a medicine to order.
FDA says poor compounding can contaminate a medicine or leave too much or too little of its working ingredient.
Read the FDA account of preparation problems
Ask who prepares the product, which pharmacy supplies it and how questions about the label will be answered.
Do not guess at storage or measurement
Storage rules differ between peptide products: some need cold storage and others are kept at room temperature.
Read the NIH storage information for semaglutide
The approved label and pharmacy instructions are the place to check the requirements for the exact product.
FDA received reports of harm, including some hospital stays, linked to measurement errors with compounded semaglutide injections.
Read the FDA alert about measurement errors
Ask the prescriber or pharmacist to resolve any unclear label or measurement instruction before use. Do not try to repair an unclear instruction with a web calculator.
Get urgent help for severe signs
MedlinePlus includes breathing difficulty, a swollen tongue and facial swelling in its description of a severe allergic reaction.
Read the page about sudden, severe allergic reactions
For severe signs of that reaction, its advice is to go to the nearest emergency room.
A medicine problem can also be reported by a patient through FDA’s free MedWatch service.
MedWatch is a reporting service, rather than an emergency-care service.