How to inject Wegovy: A step-by-step guide for UK patients

DoktorABC editorial team

Accurate, up-to-date health information written by our editorial team and reviewed by UK-registered prescribers.

How do I prepare for my first Wegovy injection?

Before injecting for the first time, read the patient information leaflet included with your pen in full. It is available at medicines.org.uk. Your prescriber or pharmacist should also have discussed the injection technique with you at the point of prescribing. If they have not, contact them before proceeding.

Confirm the following before your first injection:

• You have the correct dose pen for your stage of the titration schedule
• The pen has been stored correctly in the refrigerator (2°C to 8°C) and has not been frozen
• The liquid in the pen is clear and colourless
• You have a sharps bin available for safe disposal after use
• You have read the instructions and feel confident to proceed

What comes with the Wegovy pen and what else do you need?

Each Wegovy pack contains pre-filled FlexTouch pens, each containing four doses (one month's supply at one injection per week). The needles are not pre-attached in all formats and may be included separately in the pack. Check your specific pack contents against the patient information leaflet at medicines.org.uk.

In addition to the pen, you will need:

• A new needle for each injection (if not pre-attached)
• Alcohol wipes to clean the injection site
• Cotton wool or a clean tissue to press gently on the site after injecting
• A sharps bin for safe disposal of the used pen and needle

How to inject Wegovy: Step-by-step guide

Follow these steps each time you inject. Read them through in full before your first injection. Full instructions are also available in the patient information leaflet at medicines.org.uk.

Step 1: Prepare your pen

Remove the pen from the refrigerator and leave it at room temperature for 15 to 30 minutes before injecting. Cold injections are more uncomfortable and slightly harder to administer smoothly.

Step 2: Check the pen

Confirm it is the correct dose for your stage of treatment. Check the expiry date. Look through the viewing window to confirm the liquid is clear and colourless. If it appears discoloured, cloudy, or contains particles, do not use it.

Step 3: Wash your hands

Wash your hands thoroughly with soap and water and dry them fully before handling the pen or touching the injection site.

Step 4: Prepare the injection site

Choose your injection site (see below for approved sites and rotation guidance). Clean the area with an alcohol wipe using a circular motion and allow it to dry completely before injecting.

Step 5: Attach the needle (if required)

If needles are not pre-attached, tear off the paper tab from a new needle and push it straight onto the pen. Twist clockwise until securely tightened. Pull off the outer needle cap and set it aside. Pull off the inner needle cap and discard it. Always use a new needle for each injection. Reusing needles increases the risk of infection, injection-site reactions, and inaccurate dosing.

Step 6: Prime the pen (first use of each new pen only)

Priming ensures the pen is working correctly and that no air is in the needle. To prime, turn the dose selector to the flow check symbol, hold the pen with the needle pointing upwards, and press the injection button until a drop of liquid appears at the needle tip. This only needs to be done once at the start of each new pen.

Step 7: Select your dose

Turn the dose selector to the correct dose. The dose window will display your selected amount. Do not dial past your prescribed dose.

Step 8: Inject

Hold the pen firmly. You may lightly pinch the skin at the injection site if preferred, though this is not required. Press the pen firmly against the skin at a 90-degree angle. Press and hold the injection button until you hear or feel a click, then continue holding for a full ten seconds to ensure the complete dose is delivered. Do not lift the pen before the ten seconds are up.

Step 9: Remove the pen

After ten seconds, remove the pen from the skin. A small amount of bleeding or a drop of liquid at the site is normal. Press gently with cotton wool or a clean tissue if needed. Do not rub the injection site.

Step 10: Dispose safely

Place the used needle carefully back into the outer needle cap without touching the needle tip, then unscrew it from the pen and dispose of it in your sharps bin. Recap the pen and store it as directed. Record the date of your injection.

Where do you inject Wegovy? 

Wegovy is administered as a subcutaneous injection, meaning just under the skin rather than into a muscle or vein. The three approved injection sites are:

• Abdomen: The stomach area, excluding the 5 cm zone immediately around the navel. This is the most commonly used site and is easy to access.
• Outer thigh: The front and outer area of the upper leg. A practical alternative to the abdomen, particularly when travelling or in situations where privacy is limited.
• Upper arm: The outer, fatty area of the upper arm. This site is slightly harder to self-inject and may require assistance from another person.

All three sites are clinically equivalent in terms of absorption. The choice comes down to personal preference and comfort.

What is the best place to inject Wegovy?

The abdomen is the most commonly recommended site for new patients because it is easy to reach, offers a good amount of subcutaneous tissue in most people, and is straightforward to administer without assistance.

For patients who experience repeated injection-site reactions in the abdomen, rotating to the thigh is a practical and equally effective alternative. The upper arm is a valid option for those who are comfortable self-injecting or who have support available.

There is no clinical evidence that one site produces better weight loss results than another. Comfort and consistency of technique matter more than site selection.

How to rotate Wegovy injection sites correctly

Rotating injection sites is an important part of safe and comfortable long-term use. Injecting repeatedly into the same small area can cause lipohypertrophy, a build-up of fatty tissue under the skin that can reduce absorption and cause visible lumps.

Rotation principles

• Use a different area of the same site for each weekly injection, moving at least 2 to 3 cm away from the previous injection point
• Rotate between all three approved sites over time, rather than using only one
• Avoid injecting into areas where the skin is bruised, tender, scarred, or showing signs of a previous reaction
• Keep a simple rotation record if it helps, noting which site you used each week

Does the Wegovy injection hurt?

Most people find the Wegovy injection only mildly uncomfortable, if at all. The needle is very fine and short, and the injection itself takes only a few seconds.

The most common causes of discomfort are injecting cold medication straight from the fridge, injecting into an area that has not fully dried after cleaning with an alcohol wipe, and tensing the muscle at the injection site. All three are easily avoidable.

Tips for reducing injection discomfort

• Allow the pen to reach room temperature for at least 15 to 30 minutes before injecting
• Ensure the alcohol wipe has fully dried before inserting the needle
• Relax the muscle at the injection site rather than tensing it
• Inject slowly and hold the pen steady throughout
• Rotate sites to avoid injecting into areas that are already slightly sensitive from a previous injection

Can you inject Wegovy cold?

Technically yes, as cold storage does not affect the medication's efficacy, but it is not recommended as standard practice. Injecting cold semaglutide is more uncomfortable and the liquid flows less smoothly from the pen.

The patient information leaflet advises allowing the pen to reach room temperature before use. Fifteen to thirty minutes out of the fridge is sufficient for most patients. If you forget to take the pen out in advance, allow at least ten minutes before injecting rather than proceeding immediately from the fridge.

How to use the Wegovy pen for your first injection: Additional guidance

For your first injection, it is worth setting aside more time than you think you will need. Reading through the steps before you begin, rather than during, makes the process considerably smoother. Having everything prepared in advance, the pen at room temperature, the injection site chosen, the needle attached, and the sharps bin accessible, means there are no interruptions once you start.

Many patients find the first injection is the most daunting and that it becomes straightforward and routine from the second or third injection onwards. If you feel anxious about self-injecting, speak to your prescriber or pharmacist. Some patients prefer a brief demonstration at a clinic or pharmacy before their first self-injection at home.

What are the most common Wegovy injection mistakes and how do you avoid them? 

Injecting cold medication

Always allow 15 to 30 minutes at room temperature before injecting. Cold medication is more uncomfortable and flows less smoothly from the pen. 

Not holding the button for long enough

Releasing the injection button before the full ten seconds have elapsed is the most common reason for an incomplete dose. Hold firmly until the ten seconds are fully up before removing the pen from the skin.

Injecting into the same spot repeatedly

This leads to lipohypertrophy and reduced absorption over time. Follow the rotation guidance above.

Not priming the new pen

Skipping the priming step on a new pen can result in an air bubble in the needle and an incomplete first dose. Always prime at the start of each new pen.

Using a blunt or previously used needle

Each needle should be used only once. Reusing needles increases the risk of infection, injection-site reactions, and inaccurate dosing.

Injecting into unsuitable skin

Avoid bruised, scarred, inflamed, or previously reacted areas. If in doubt, choose a different site.

Disposing of the pen incorrectly

Used pens and needles must go into a sharps bin, not household waste. Contact your pharmacy if you need a replacement sharps bin or disposal instructions.

Final thoughts

The Wegovy injection becomes routine quickly for the vast majority of patients. The pen is designed to be used without clinical training, and the technique required is straightforward once you have worked through it once or twice. Taking the time to prepare correctly before each injection, keeping to a consistent weekly schedule, and rotating sites carefully are the habits that make the most difference to comfort and outcomes over time.

If you have any concerns about your injection technique, experience unusual reactions at the injection site, or are unsure about any aspect of your treatment, contact your prescriber. Report any suspected side effects via the MHRA Yellow Card scheme at

FAQ

The DoktorABC medical advisory board

Dr. Roland Ruiken

Medical advisor, Norway

Dr. Viktor Simunovic

Medical advisor, Croatia

To the medical advisory board