How to Inject Semaglutide: A Step-by-Step Guide

Semaglutide is a once-weekly subcutaneous injection, meaning it goes just under the skin — not into muscle. The needles are very small and thin, and most people describe the discomfort as minimal. Once you've done it a few times, the process typically takes less than a minute and becomes routine.

This guide walks you through every step, from preparing your supplies to disposing of the needle safely. Whether you're using a pre-filled auto-injector pen (like Wegovy or Ozempic) or vials of compounded semaglutide with syringes, the core principles are the same.

What You'll Need

• Your semaglutide medication (pen or vial with syringe)
• Alcohol swabs
• A sharps disposal container (a puncture-resistant container — never a regular trash bin)
• Clean hands

Step 1: Gather and Prepare Your Supplies

Remove your semaglutide from the refrigerator about 15–30 minutes before your injection. Cold medication can sting more. Allow it to come to room temperature — but never warm it with heat or microwave it.

Check the medication: the liquid should be clear and colorless. If it appears cloudy, discolored, or has particles floating in it, do not use it — contact your pharmacy.

Wash your hands thoroughly with soap and water for at least 20 seconds and dry them completely before handling your supplies.

Step 2: Choose Your Injection Site

Semaglutide is injected subcutaneously (under the skin) in one of three locations:

Abdomen

The most commonly used site. Inject into the fatty tissue of the abdomen, at least 2 inches away from your belly button. Avoid the area immediately around the navel, which has thinner skin and more nerve endings.

Outer Thigh

The front and outer portion of either thigh is a good alternative. Reach the middle of the outer thigh — about halfway between your knee and hip.

Upper Arm

The back or outer area of the upper arm works as well, though it can be harder to reach if you're injecting yourself. If a caregiver or partner is helping, this is a perfectly accessible site.

Rotating Sites

This is important: rotate your injection sites each week. Using the same spot repeatedly causes lipohypertrophy — a thickening or lumping of the fatty tissue under the skin that can affect how well medication is absorbed. A simple rotation schedule works well: left abdomen, right abdomen, left thigh, right thigh, and so on.

Step 3: Clean the Injection Site

Use an alcohol swab to clean the skin at your chosen injection site. Wipe in a circular motion and allow it to dry completely — about 10–15 seconds. Injecting into wet or still-damp skin can sting more.

Step 4: Prepare Your Pen or Syringe

If Using a Pre-Filled Pen (Wegovy / Ozempic)

Attach a new needle to the pen (never reuse needles). Remove the outer needle cap and set it aside — you'll need it for disposal. Remove the inner needle cap and discard it. Prime the pen by holding it with the needle pointing up and pressing the dose button until a drop of medication appears at the needle tip. This removes air bubbles and confirms the pen is working.

If Using Vials and Syringes (Compounded Semaglutide)

Wipe the top of the vial with an alcohol swab. Draw back the plunger to pull air into the syringe equal to your dose amount. Insert the needle into the vial and inject the air (this equalizes pressure). Turn the vial upside down and draw out your prescribed dose. Check for air bubbles — if present, tap the syringe gently and push any bubbles out.

Step 5: Inject the Medication

Use your non-dominant hand to gently pinch about an inch of skin and fatty tissue at your chosen site — this lifts the subcutaneous tissue away from muscle. Hold the pen or syringe at a 90-degree angle to the skin (straight in). For very lean individuals, a 45-degree angle may be appropriate — your provider can advise.

Insert the needle with a smooth, steady motion. Press the plunger (or dose button on a pen) slowly and steadily until the full dose is delivered. With an auto-injector pen, you'll hear or feel a click when the dose begins. Hold the needle in place for 5–10 seconds after the dose to allow the medication to fully disperse before removing.

Release the pinched skin. Remove the needle in one smooth motion — don't wiggle or twist. Apply light pressure with a clean finger or gauze if there's any minor bleeding. Do not rub the site, as this can cause irritation.

Step 6: Dispose of the Needle Safely

Never recap a needle with two hands — use the one-handed scoop method if recapping is necessary, or go directly to your sharps container. Drop the needle into your sharps disposal container immediately. Sharps containers are available at most pharmacies and are often included with your prescription.

When the container is 3/4 full, seal it and check your local guidelines for disposal — many pharmacies accept filled sharps containers, or your municipality may have a drop-off program. Never place loose needles in household trash or recycling.

Tips for a More Comfortable Injection

• Let the medication warm to room temperature before injecting
• Inject slowly — there's no need to rush the plunger
• Make sure the site is fully dry after cleaning with alcohol
• Try injecting at a different time of day if you're consistently experiencing irritation
• Talk to your provider if you notice persistent redness, swelling, or hard lumps at injection sites

For questions about managing side effects like nausea during your semaglutide treatment, see our guide: GLP-1 Nausea: Why It Happens and How to Manage It. Or if you're still deciding whether semaglutide is right for you, read our comparison of metformin vs. semaglutide for weight loss.