Starting a new weight loss treatment can feel overwhelming, especially when it involves medication like Mounjaro. Understanding how to use it correctly is key to achieving the best results safely and effectively. At Market Harborough Pharmacy, we’re here to guide you through every step of your Mounjaro journey, from your first dose to ongoing support.
What Is Mounjaro?
Mounjaro (tirzepatide) is a prescription medication designed to support weight management in adults who are overweight or obese. It works by mimicking the effects of two natural hormones, GLP-1 and GIP, which help regulate blood sugar levels, reduce appetite, and slow digestion. This combination makes Mounjaro one of the most effective treatments available for long-term weight loss.
It’s typically used alongside a balanced diet, increased physical activity, and medical supervision to help individuals achieve sustainable results. Many patients notice reduced cravings, improved portion control, and steady, manageable weight loss over time.

How to Use Mounjaro
Mounjaro is administered as a once-weekly injection under the skin (subcutaneous injection). It comes in a pre-filled pen, making it easy to use at home with minimal discomfort. Here’s a step-by-step guide on how to use Mounjaro safely and effectively:
1. Choose the Right Injection Site
You can inject Mounjaro into one of three areas:
- –> The front of your thighs
- –> Your stomach area (at least 2 inches away from the belly button)
- –> The back of your upper arms (if someone else is administering it for you)
Rotate the injection site each week to reduce the risk of irritation or tenderness. Avoid injecting into areas that are bruised, swollen, or scarred.
2. Prepare the Pen
Before injecting, wash your hands thoroughly and ensure the pen is at room temperature. Check that the medicine is clear and colourless—if it’s cloudy or contains particles, do not use it. Once ready, remove the cap and follow the instructions on the pen for activation. Each pen is designed for single use only.
3. Inject the Dose
Press the pen firmly against your chosen injection site and follow the on-pen instructions to deliver the medication. Hold it in place until the full dose is administered. Once complete, safely dispose of the used pen in a sharps container provided by your pharmacy.
4. Set a Weekly Schedule
Mounjaro should be taken on the same day each week, at any time of day, with or without food. Consistency is crucial for maintaining stable hormone levels and achieving optimal results. If you need to change your injection day, ensure there’s at least a three-day gap between doses.
Missed a Dose?
If you forget a dose of Mounjaro, take it as soon as you remember—provided it’s within four days (96 hours) of your scheduled time. If more than four days have passed, skip the missed dose and continue with your next scheduled injection. Do not take two doses within three days of each other.
Common Side Effects and How to Manage Them
Like most medications, Mounjaro may cause some mild side effects, especially during the first few weeks as your body adjusts. These can include:
- –> Nausea or vomiting
- –> Diarrhoea or constipation
- –> Stomach discomfort or bloating
- –> Fatigue or mild headaches
These symptoms are typically temporary and can be reduced by:
- –> Eating smaller, lighter meals
- –> Avoiding fatty or spicy foods
- –> Staying hydrated
- –> Getting enough rest
If side effects persist or worsen, it’s important to speak with your pharmacist or prescribing clinician for tailored advice.

Tips for Getting the Best Results
Mounjaro works best when combined with healthy lifestyle changes. Here are some expert tips to maximise your results:
- –> Stay consistent: Take your injection on the same day each week to maintain stable hormone levels.
- –> Focus on nutrition: Eat a diet rich in lean proteins, vegetables, and whole grains.
- –> Stay active: Incorporate daily movement—whether it’s walking, cycling, or light gym workouts.
- –> Stay hydrated: Drink plenty of water throughout the day to support metabolism and energy levels.
- –> Track your progress: Keep a journal of your weight, diet, and exercise to stay motivated.
Why Choose Market Harborough Pharmacy for Mounjaro Support?
At Market Harborough Pharmacy, we provide more than just prescriptions. Our expert clinicians offer personalised guidance on how to use Mounjaro correctly, monitor your progress, and adjust your plan as needed. We ensure your treatment is safe, effective, and tailored to your individual health goals.
Our team can also provide advice on managing side effects, meal planning, and maintaining long-term results. Whether you’re starting your Mounjaro journey or looking for continued support, we’re here to help you every step of the way.
Book Now for Expert Weight Loss Support
If you’re ready to start your journey with Mounjaro and want expert guidance on how to use it safely and effectively, our friendly team at Market Harborough Pharmacy is here to help.
Book now to arrange your consultation and take the first step towards a healthier, more confident you.
This blog was written on behalf of Market Harborough Pharmacy by Pharmacy Mentor.
