How to Inject Semaglutide

Semaglutide is available in two main forms:

• Pre-filled pen injectors (Ozempic®, Wegovy®) — These are manufactured by Novo Nordisk with pre-measured doses. You attach a new needle tip, dial your dose, and inject. No reconstitution required.
• Compounded semaglutide vials — Lyophilized powder that requires reconstitution with bacteriostatic water before injection using an insulin syringe. These are available from compounding pharmacies and research chemical suppliers.

The injection technique is the same for both — subcutaneous injection into the abdomen, thigh, or upper arm. The key difference is dose measurement: pens use a dial mechanism, while vials require drawing the correct volume with a syringe.

If using a pre-filled pen (Ozempic® or Wegovy®), follow these steps:

1. Attach a new needle. Remove the pen cap, peel the paper tab off a new pen needle, and push it straight onto the pen tip. Remove the outer and inner needle caps.
2. Prime the pen (first use only). Turn the dose selector to the flow check symbol. Press the injection button until "0" appears and a drop of solution is visible at the needle tip.
3. Select your dose. Turn the dose selector to your prescribed dose. The dose counter will display the selected amount.
4. Choose your injection site. Clean the area with an alcohol swab. The abdomen, thigh, or upper arm are all approved sites.
5. Inject. Insert the needle at a 90° angle. Press the injection button fully and hold for 6 seconds to ensure complete dose delivery.
6. Remove and dispose. Pull the needle out, replace the outer cap, unscrew the needle, and dispose in a sharps container. Replace the pen cap.

If using a compounded semaglutide vial (lyophilized powder), you'll first need to reconstitute it:

1. Reconstitute the peptide. Add the specified volume of bacteriostatic water to the vial. For a 5 mg vial, adding 2 mL yields 2.5 mg/mL. See our reconstitution guide for detailed instructions.
2. Calculate your dose volume. For a 0.25 mg dose at 2.5 mg/mL concentration: 0.25 ÷ 2.5 = 0.1 mL (10 units on an insulin syringe).
3. Draw your dose. Swab the vial stopper, insert the syringe, invert the vial, and draw to the correct mark. Remove air bubbles by flicking the syringe and pushing them out.
4. Inject subcutaneously. Clean the injection site, pinch the skin, insert the needle at 90°, inject slowly, then withdraw and apply gentle pressure.

Dose reference table (5 mg vial reconstituted with 2 mL BAC water = 2.5 mg/mL):

Semaglutide can be injected subcutaneously in three FDA-approved sites:

• Abdomen — Avoid the 2-inch area around the navel. The lower abdomen provides the most consistent absorption.
• Upper thigh — The front outer area of the thigh, midway between the knee and hip.
• Upper arm — The back of the upper arm (may need assistance).

Rotate weekly. Since semaglutide is injected only once per week, it's easy to rotate between these three sites on a 3-week cycle. Consistent rotation prevents lipodystrophy and injection site reactions.

When to inject: Choose the same day each week. Semaglutide can be administered at any time of day, with or without food. Many users prefer evening injections, reporting that sleeping through the initial hours after injection reduces nausea perception.

Tips for managing nausea (the most common side effect):

• Eat smaller, more frequent meals rather than large portions
• Avoid high-fat and greasy foods, especially in the first 48 hours after injection
• Stay hydrated — sip water throughout the day
• Follow the titration schedule strictly — do not skip dose escalation steps
• Consider ginger tea or ginger supplements for mild nausea relief
• If nausea is severe at a given dose, remain at that dose for an extra 4 weeks before escalating

Semaglutide is an FDA-approved prescription medication. It should only be used under the supervision of a licensed healthcare provider. Compounded semaglutide is not FDA-approved and may vary in quality and purity.

Do not use semaglutide if you have a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia type 2. Report symptoms such as severe abdominal pain, persistent vomiting, or a lump in the neck to your doctor immediately. This article is for educational purposes only.