Giving yourself a semaglutide injection is straightforward once you’ve done it a couple of times. The medication comes in a pre-filled pen, so you don’t need to draw up a dose from a vial. The whole process takes about two minutes: prep the pen, clean your skin, insert the needle, press the button, and hold for a slow count of six.
Choose and Prepare Your Injection Site
You have three options for where to inject: your abdomen, your upper thigh, or the back of your upper arm. The abdomen is the most popular choice because it’s easy to reach and has a generous area of soft tissue. If you use your stomach, stay at least two inches away from your belly button. The upper arm can be tricky to do yourself since you’re working one-handed, so many people save that spot for when someone else is helping.
Rotate your injection site each week. If you injected into the left side of your abdomen last time, move to the right side or switch to your thigh. Rotating prevents scar tissue from building up under the skin, which can interfere with how well the medication absorbs. Clean the area with an alcohol swab and let it air dry before you inject.
Prepare the Pen
If you’re using a brand-new pen, you need to check the flow before your first injection. Attach a new needle by pushing it straight onto the pen tip and twisting until it’s secure. The pens are designed for short, fine needles up to 8 mm in length. Pull off both the outer and inner needle caps.
Turn the dose selector until the dose counter displays the flow check symbol. Point the needle upward, then press and hold the dose button until the counter returns to zero. You should see a small drop of liquid appear at the needle tip. This confirms the pen is working and the medication is flowing. If no drop appears, repeat the process up to six times. If it still doesn’t work, the pen may be defective.
Once the flow check is done (or if you’ve already used this pen before), dial your prescribed dose by turning the dose selector. The dose counter will show the exact number. If you accidentally dial past your dose, you can turn it back without wasting any medication.
Inject the Medication
Hold the pen in one hand. With your other hand, you can lightly pinch a fold of skin at the injection site, though this isn’t strictly required for everyone. Insert the needle at a 90-degree angle, straight into the skin, with a quick, steady motion. Hesitating tends to make it hurt more.
Once the needle is in, press the dose button with your thumb and hold it down. Watch the dose counter in the pen window. When it reaches zero, keep the needle in your skin and slowly count to six before pulling it out. This pause ensures the full dose has been delivered and prevents medication from leaking back out of the injection site. If you pull the needle out too quickly, you may see a drop of liquid at the skin surface, which means you didn’t get the complete dose.
After removing the needle, don’t rub the area. A tiny drop of blood or a small red mark is normal and nothing to worry about.
Dispose of the Needle Safely
Never reuse a needle. After each injection, carefully replace the outer needle cap (using a one-handed scooping technique to avoid a needlestick) and unscrew the needle from the pen. Drop it immediately into a sharps disposal container. These are rigid plastic containers with puncture-resistant lids, available at most pharmacies for a few dollars.
If you don’t have a proper sharps container, the FDA says you can use a heavy-duty plastic household container as a substitute, something like a laundry detergent jug. It needs to be leak-resistant, stay upright on its own, and have a tight-fitting lid that a needle can’t poke through. Label it so no one opens it by mistake. When the container is about three-quarters full, seal it and follow your local community’s guidelines for hazardous waste disposal.
Store the Pen Correctly
Before you use a pen for the first time, keep it in the refrigerator between 36°F and 46°F. Never freeze it. Frozen semaglutide is ruined and should be thrown away.
Storage rules differ slightly by brand once you’ve started using a pen. An Ozempic pen can be kept at room temperature (up to 86°F) or in the fridge for up to 56 days after first use. A Wegovy pen is more limited: it can stay out of the fridge for up to 28 days, and only before the cap has been removed. In both cases, keep the pen cap on when it’s not in use to protect the medication from light. Store the pen without a needle attached, since leaving a needle on can let air into the cartridge or cause leaking.
What To Do if You Miss a Dose
Semaglutide is a once-weekly injection, so you have a built-in window if you forget. For Ozempic, you can take the missed dose as long as it’s within five days of when you were supposed to inject. After that, skip it entirely and take your next dose on the regularly scheduled day. For Wegovy, the general guidance is similar: take it as soon as you remember unless your next dose is coming up soon. In either case, never double up by taking two doses to make up for a missed one.
If you find yourself frequently forgetting, try picking a consistent day and time each week. You don’t have to inject at the exact same hour, but keeping a routine makes it easier to remember. Setting a recurring phone alarm is a simple fix that works for most people.
Tips for a More Comfortable Injection
The needles used with semaglutide pens are very short and thin, so most people describe the sensation as a mild pinch rather than real pain. Still, a few things can make it even easier. Let the pen sit at room temperature for about 30 minutes before injecting. Cold medication stings more going in. Insert the needle quickly rather than slowly pushing it through the skin. And relax the muscle underneath the injection site. Tensing up makes the tissue firmer and the needle harder to push through.
Some redness, mild swelling, or itching at the injection site is common, especially during the first few weeks. These reactions usually fade on their own within a day or two. If you notice a hard lump under the skin that doesn’t go away, that could be a sign of scar tissue from injecting in the same spot too often, which is another reason to stay consistent with rotation.