What to watch for in the injection instructions you are given
Quick answer. Good instructions name the exact product, state the strength in plain units, tell you what to do about a missed dose and give you someone to call. Red flags include a dose written only in syringe marks, a dose above the label, a product labeled "for research", and nobody to ask. This page does not teach injecting. Your clinic, your pharmacy and the maker's own written instructions do.
What this page is, and what it is not
This page helps you judge the instructions someone hands you. It does not show how to prepare or give an injection, and it does not give amounts. Those come from your prescriber and from the instructions that come with your product.
The reason to check is that mistakes happen. The FDA has received reports of serious adverse events linked to dosing errors with compounded semaglutide, where patients measured and gave themselves the wrong dose and, in some cases, health professionals miscalculated the dose. As of May 31, 2026, the agency had received 990 adverse event reports for compounded semaglutide and 730 for compounded tirzepatide. The FDA says these are probably underreported, and a report does not prove the drug caused the problem.
Which kind of product do you have?
Where good instructions come from depends on the product. Work out which row fits yours first.
| Product | Where the instructions come from | What to look for |
|---|---|---|
| A brand-name pen or vial made by the drug company | The maker writes them, as part of an FDA-reviewed label. The label for each medicine is posted on DailyMed. | The brand and strength on the box match your prescription. The written instructions in the box match the product you are holding. |
| A compounded product from a pharmacy | There are no FDA-approved instructions. The prescriber and the pharmacy supply them. | Written instructions from the pharmacy for this exact product and strength, a pharmacy name and phone number, and a prescriber who has gone over them with you. |
| A product sold online as "research" or "not for human consumption" | There are none that you can rely on. The FDA warns that these products are sold for human use and are of unknown quality. | Treat this as a red flag. Talk to your prescriber before using anything like it. |
A checklist for any set of instructions
Good instructions answer these questions in writing. If one is missing, ask.
- The exact name of the medicine and its strength, matching the label on what you were given.
- The dose written in the unit the label uses, and, if you draw it up yourself, how that dose looks on the syringe you were given. Seeing it written two ways gives you a way to catch a mistake. This is the Atlas's reasoning, not a quote from a source.
- How often and on which day, and what the starting schedule is.
- What to do about a missed dose.
- How to store it before and after opening, and when to throw it away.
- Where to get rid of used needles and pens, and what container to use.
- What symptoms mean you should call, and who to call, including after hours.
- Who prescribed it, which pharmacy filled it, and how to reach both.
Red flags
| Red flag | Why it matters | What to do |
|---|---|---|
| The dose appears only in syringe marks, "units" or clicks, with no strength or volume you can check against the label | The FDA has reports of patients measuring and giving the wrong dose of compounded products. A number with no unit or no way to check is easy to get wrong. | Ask the pharmacy or prescriber to write the dose in the unit the label uses and show you the matching mark on your syringe. |
| A dose, a schedule or a dose increase that is faster than the label | The FDA has reports of adverse events in people prescribed compounded semaglutide or tirzepatide at doses above the approved label, including larger single doses, more frequent dosing and faster increases. Reported symptoms included nausea, vomiting, diarrhea, abdominal pain and constipation, and some events were serious. | Ask why the plan differs from the label for the brand-name product, and who is watching you while you follow it. |
| A product called "semaglutide sodium" or "semaglutide acetate" | The FDA says these are different active ingredients from those in approved drugs, that it lacks data on whether they behave the same way, and that it knows of no lawful basis for using them in compounding. | Ask the pharmacy which ingredient is in the product and why. |
| Instructions that come from a seller, a social media post or a group chat instead of your prescriber or pharmacy | The FDA has warned about illegally marketed semaglutide and tirzepatide sold online, which may be counterfeit or contain the wrong or harmful ingredients. It is also aware of counterfeit Ozempic in the U.S. | Use a prescription filled at a state-licensed pharmacy. The FDA points to its BeSafeRx campaign for buying medicines online safely. |
| No pharmacy name, no phone number, no expiry or beyond-use date on the label | You cannot check where it came from, how long it is good for, or whom to ask. | Call the pharmacy before using it. |
| Nobody to call if you feel unwell, and no list of warning signs | Side effects are most likely while the dose is being raised, and some are serious. | Ask for the clinic's number, the after-hours number and the symptoms that mean call right away. For an emergency, call 911. |
Checks when the package arrives
- Your name, the medicine, the strength and the quantity match what was prescribed.
- The pharmacy name and contact details are on the label.
- There is an expiry or beyond-use date, and storage directions.
- The product matches its written instructions. If the packaging looks different from what you were told to expect, call before using it.
- The instructions you were given are for this product and this strength, not for a different one.
If something goes wrong
If you think you took the wrong amount or feel unwell afterward, call your prescriber or pharmacy right away, and call 911 for an emergency. The FDA asks people to report adverse events and product quality problems through its MedWatch program. You can also contact the agency's drug information line at 855-543-3784 or druginfo@fda.hhs.gov.
Where the how-to lives
The Atlas does not teach injecting. For a brand-name pen, the maker's written instructions and your clinic are the source, and the brand-name pens page retells what those sheets say in plain English. For a compounded product, the pharmacy and prescriber must give you instructions for that exact product, and you can ask them to walk you through it. The compounded versus brand-name page explains why the two are not the same thing, and the reconstitution calculator is a math tool, not a recommendation for any amount.
Quick answers
- What should injection instructions for a GLP-1 medicine include?
- The exact product and strength, the dose in the unit on the label, how often and on which day, what to do about a missed dose, storage and disposal, warning signs, and who to call.
- Are compounded semaglutide and tirzepatide dosed the same way as Wegovy and Zepbound?
- Not necessarily. A compounded product has no FDA-approved instructions, so the dose and how it is measured come from the pharmacy and prescriber. The FDA has received reports of serious events from dosing errors and from doses above the label.
- What are red flags in injection instructions?
- A dose given only in syringe marks, a plan faster than the label, a different salt form, instructions from a seller instead of a pharmacy, a missing pharmacy or expiry date, and no one to call.
- Who do I contact if I think I took the wrong dose?
- Call your prescriber or pharmacy right away, and call 911 in an emergency. Adverse events can be reported to the FDA through MedWatch.
- Does this page show how to give an injection?
- No. It helps you judge the instructions you are given. Training comes from your clinic, your pharmacy and the maker's written instructions.
Questions to ask
- Can you write my dose in the unit on the label and show me the matching mark on my syringe?
- Is this the same strength and form as the brand-name product, and if not, what is different?
- Who do I call, including after hours, if I feel unwell or think I made a mistake?
- What do I do about a missed dose?
- How should I store it, how long is it good for once opened, and where do I dispose of needles?
- Which pharmacy made this, and is it state-licensed?
What is still unknown
- The Atlas did not read each product's written instructions line by line for this page, and it did not read FDA guidance on disposing of needles.
- The FDA report counts are as of May 31, 2026 and have likely changed since. They come from voluntary reports.
- How often dosing mistakes happen in everyday use is not known, because many are probably never reported.
Sources
- FDA's concerns with unapproved GLP-1 drugs used for weight loss U.S. Food and Drug Administration. Page content current as of October 1, 2026. Adverse event counts are as of May 31, 2026. Regulator
- Compounding and the FDA: questions and answers U.S. Food and Drug Administration. Page content current as of September 16, 2025. Regulator
- Wegovy (semaglutide) injection and tablets: prescribing information Novo Nordisk, on DailyMed (U.S. National Library of Medicine). Label version 6/2026. One label covers both the injection and the tablets. Official FDA label on DailyMed
- Zepbound (tirzepatide) injection: prescribing information Eli Lilly and Company, on DailyMed (U.S. National Library of Medicine). Label version 8/2026. Official FDA label on DailyMed
- DailyMed: current FDA drug labels U.S. National Library of Medicine. Regulator