How to Inject Semaglutide at Home: The Six-Point Check Before Every Dose

Learning how to inject semaglutide at home takes about ten minutes of teaching and a lifetime of repetition, and the pattern in the injections that go wrong is remarkably consistent: the problem almost never happens after the needle is in. It happens in the half minute before, when the wrong pen comes out of the fridge, the dose window is not read, or a syringe is filled by guesswork. This page walks through the injection the way a clinic nurse actually teaches it, and adds something the pen leaflet does not: a six-point check you say out loud before every dose. That check is the original element here. It exists because the semaglutide overdoses in the published record cluster at exactly these six points.

What you are holding matters before technique does. Two very different objects both get called a semaglutide injection. A branded pen (Wegovy for weight management, Ozempic for type 2 diabetes) delivers a fixed, pre-measured dose; you cannot draw up the wrong amount because there is nothing to draw. A compounded vial, dispensed with separate insulin syringes, requires you to measure the dose yourself in units on the syringe barrel. The technique from the skin down is nearly identical. The risk profile above the skin is not, and the U.S. Food and Drug Administration has documented dosing errors with compounded semaglutide, some involving patients who injected many times the intended amount. Know which object you have before reading further.

The six-point check, in the order a nurse runs it. Each point takes a few seconds. Skipping one is how a routine shot becomes an emergency room visit.

Check one: the name and strength on the label match the prescription. Say them both aloud. Wegovy pens are color coded by strength and come in five doses; Ozempic pens hold several doses each and are dialed to the milligram amount. If the strength on the pen is not the one for your current titration week, stop. This single check catches the most common error in patients who keep more than one strength in the fridge while their dose is changing.

Check two: the dose in the window, or the dose in units. On a dial pen, the number in the window must read the milligram dose you were told and nothing else. On a compounded vial this check is arithmetic, and it is where the published overdoses cluster. A case series in the Journal of the American Pharmacists Association described patients who reached a poison control center after drawing up ten times their intended dose, having confused units, milliliters and milligrams. Our conversion rule, stated so you can check it yourself: divide the milligram dose by the vial concentration in milligrams per milliliter to get milliliters, then multiply by one hundred to get units on a U-100 insulin syringe. A quarter milligram from a vial labeled 2.5 mg per mL is 0.1 mL, which is 10 units. If your answer is a number that would fill most of the syringe, your math is wrong, not your prescription.

Check three: the site, and where the last one went. Semaglutide goes into the fat just under the skin of the abdomen, the front of the thigh, or the back of the upper arm. The FDA label for Wegovy states that exposure is similar from all three sites, so the choice is about comfort and rotation, not effectiveness. Stay at least two inches from the navel, avoid any spot that is bruised, tender, scarred or lumpy, and move at least an inch from last week's site. If you have already met the rotation lump nobody warned you about, you know why this check is not optional.

Check four: skin and needle prep. Wash your hands, swab the site, and let the alcohol dry completely; wet alcohol carried in by the needle stings and adds nothing to sterility. On a dial pen, attach a new needle every time and prime it as the instructions describe until a drop appears at the tip. Single-use Wegovy pens arrive with the needle covered and need no priming. A pen that has sat out of the fridge for fifteen to thirty minutes injects with noticeably less sting than one used cold.

Check five: the hold. This is the step most people cut short. Pinch a fold of skin if you are lean, insert the needle straight in at ninety degrees, press the button fully and keep it pressed. On a Wegovy pen you hear a click when the injection starts and a second click near the end; keep the pen against the skin until the yellow bar in the window stops moving, which takes around ten seconds. On an Ozempic pen the dose counter must return to zero, and you keep pressing while counting slowly to six after it does. Pulling out early is the quiet cause of the dose that "did not seem to work this week." MedlinePlus and the Mayo Clinic both publish the full patient instructions and are worth reading beside your pen's own leaflet.

Check six: what happens to the needle and the record. The used needle or pen goes into an FDA-cleared sharps container, or a heavy plastic household container with a screw-on lid, never loose in the trash; the FDA's sharps disposal guidance covers what counts. Then write down the date, the dose and the site. A dated log is the only reliable defense against the two most common weekly questions: did I already inject, and where did I put it last time. If a week does slip, the missed dose rule is time-based and is covered separately.

What the instructions for use do not tell you. Three gaps come up in nearly every teaching visit and none of them is in the leaflet. First, the leaflet gives a hold time but never describes an incomplete hold: a wet bead on the skin after withdrawal, or medication still visible in the window, means part of the dose stayed in the pen. The correct response is to not inject again and to note it for your prescriber, because a repeat dose is the more dangerous error. Second, the leaflet does not say that the same site used two weeks in a row can slow absorption and leave a firm nodule, which is the whole reason check three exists. Third, no leaflet addresses the compounded-vial arithmetic at all, because every leaflet was written for a pen. That silence is why the poison control case series exists.

The weekly pattern most patients settle into. Pick the same day and roughly the same time each week; the drug's half-life is about a week, so consistency matters far more than clock precision. Take the pen out of the fridge, run the six-point check while it warms, inject, log it, and put unused pens back in the fridge. The storage rules cover what changes when you travel. Dose increases every four weeks are set by your prescriber, not by the pen, and the low starting dose is deliberate rather than cautious.

Where the injection fits in a supervised program. A weekly shot is the most visible part of medical weight loss, but it is a tool inside a plan, not the plan itself. Programs that hold their results pair the medication with protein targets, strength work, and an honest conversation about the long horizon, including the point at which a medication alone is not enough and weight loss surgery makes sense for a particular patient. The injection is the easy part to teach. The six-point check exists so it stays easy, every week, for as long as you are on it.