At Eltham Pharmacy, we understand that starting any new treatment can feel daunting. For many of our patients, learning how to inject Mounjaro for the first time is one of the biggest concerns when beginning their weight management journey. While it may seem intimidating at first, the process is straightforward once you know the correct steps. Our team is here to provide guidance and support, both in person at our weight loss clinic in Eltham and through clear instructions you can follow at home.

Preparing for Your First Injection

Before you begin, make sure you are in a clean and comfortable environment. Wash your hands thoroughly with soap and water, and check that your Mounjaro pen has been stored correctly in the fridge. Take it out and allow it to come to room temperature for about 30 minutes, as this can make the injection more comfortable. Do not use the pen if it has been frozen, damaged, or if the liquid inside looks cloudy or contains particles.

You should also check that you have the correct dose as prescribed by your clinician. If you are unsure, do not inject until you have confirmed the details with your pharmacist or prescriber.

Choosing an Injection Site

Mounjaro is injected under the skin, known as a subcutaneous injection. The most common sites are the abdomen, the front of the thighs, or the back of the upper arms. For your first injection, many patients find the abdomen easiest because it is easy to see and reach. Make sure to avoid areas that are bruised, tender, or scarred.

Going forward, it is important to rotate injection sites. Repeatedly using the same spot can cause irritation or lumps under the skin. For example, if you use the right thigh one week, switch to the left thigh or your abdomen the next. Keeping a small record of your chosen sites can help you maintain a good routine.

How to Inject Mounjaro

Once you are ready, clean the area of skin with an alcohol swab and let it dry. Remove the cap from your Mounjaro pen. Place the pen firmly against your skin at the chosen injection site, then press the button to release the medication. You may hear a click and see the indicator window move as the injection takes place. Hold the pen in place until the injection is complete, which usually takes around ten seconds.

You may feel a slight pinch, but most patients report that the injection is less uncomfortable than they expected. After the injection, remove the pen and safely dispose of it in a sharps container. Do not attempt to reuse the pen.

After Your First Injection

It is normal to feel a little nervous after injecting for the first time, but most patients quickly gain confidence. You may experience mild side effects such as nausea, constipation, or bloating in the first few weeks of treatment. These effects are usually temporary as your body adjusts. If side effects persist or feel severe, contact your pharmacist or prescriber for advice.

You should continue to inject Mounjaro once a week, ideally on the same day each week. Setting a reminder on your phone or calendar can help you stay consistent. If you ever miss a dose, check the patient information leaflet or speak to our team for guidance on what to do next.

Building Confidence with Future Injections

As you become more familiar with how to inject Mounjaro, you will find that the process becomes routine. Rotating injection sites will help keep your skin healthy, and following the same preparation steps each time ensures safety and comfort. Many of our patients find that after the first few weeks, injecting feels no more difficult than brushing their teeth or taking daily medication.

It is also helpful to remember that you are not alone. At our weight loss clinic in Eltham, we provide in-person demonstrations and ongoing support. If you are unsure about technique, nervous about injecting, or simply want reassurance, you can book an appointment with one of our pharmacists.

Support at Eltham Pharmacy

Learning how to inject Mounjaro for the first time is just one part of your weight management journey. At Eltham Pharmacy, we believe that safe and effective use of medicines should always go hand in hand with lifestyle support. That is why our clinic offers advice on diet, activity, and long-term weight management strategies alongside access to treatments like Mounjaro.

Our role is not just to supply a prescription, but to make sure you feel confident and supported at every stage. Whether it is your first injection or your tenth, you can always reach out to our team for help.

Comfortable, Confident Weight Loss

Starting Mounjaro can feel like a big step, but once you know how to inject Mounjaro properly, it quickly becomes part of a manageable weekly routine. By preparing carefully, rotating injection sites, and seeking professional support when needed, you can use the treatment safely and effectively.

If you would like more guidance or a demonstration, visit or reach out to our weight loss clinic in Eltham. Our pharmacists are here to help you feel comfortable, confident, and ready to take control of your weight management journey.

This blog was written on behalf of Eltham Pharmacy by Pharmacy Mentor.