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- Mounjaro Injection
Mounjaro is prescription medicine licensed for weight loss and weight maintenance in adults. Mounjaro primarily works by regulating your appetite, giving you a sense of satiety (‘fullness’), making you feel less hungry and experience less food cravings. This will help you eat less food and reduce your body weight.
Mounjaro is indicated for people with a BMI over 30 or a BMI over 27 with additional weight-related health concerns such as high blood pressure, diabetes, heart disease and raised cholesterol.
The dose should be started low (2.5mg) and then increased every 4 weeks until the required dose (5mg, 10mg or 15mg) is reached.
Mounjaro is given as an injection under the skin (subcutaneous injection). The best places to give the injection are the upper arms, stomach or upper legs.
Mounjaro is injected once a week on the same day each week, whenever possible. The injection can be administered at any time of the day – regardless of meals. If necessary, the day of the weekly injection of this medicine can be adjusted as long as it has been at least 3 days since the last injection.
Allergy to any of the ingredients in this medicine
Uncommon (up to 1 in 100 people)
• Inflamed pancreas (acute pancreatitis) which could cause severe pain in the stomach and back which does not go away. You should see a doctor immediately if you experience such symptoms.
Rare (up to 1 in 1 000 people)
• Severe allergic reactions (e.g. anaphylactic reaction, angioedema). You should get immediate medical help and inform your doctor if you experience symptoms such as breathing problems, rapid swelling of the lips, tongue and/or throat with difficulty swallowing and a fast heartbeat.
Other side effects
Very common (more than 1 in 10 people)
• Low blood sugar (hypoglycaemia) when tirzepatide is used for the treatment of type 2 diabetes with medicines that contain a sulphonylurea and/or insulin. If you are using a sulphonylurea or insulin, the dose may need to be lowered while you use tirzepatide. Symptoms of low blood sugar may include headache, drowsiness, weakness, dizziness, feeling hungry, confusion, irritability, fast heartbeat and sweating. Your doctor should tell you how to treat low blood sugar.
• Feeling sick (nausea)
• Diarrhoea
• Being sick (vomiting) – this usually goes away over time
• Constipation
Common (up to 1 in 10 people)
• Low blood sugar (hypoglycaemia) when tirzepatide is used for type 2 diabetes with both metformin and a sodium-glucose co-transporter 2 inhibitor (another diabetes medicine). Symptoms of low blood sugar may include headache, drowsiness, weakness, dizziness, feeling hungry, confusion, irritability, fast heartbeat and sweating. Your doctor should tell you how to treat low blood sugar.
• Allergic reaction (hypersensitivity) (e.g., rash, itching, and eczema)
• Dizziness observed in patients treated for weight management
• Low blood pressure observed in patients treated for weight management
• Feeling less hungry (decreased appetite) observed in patients treated for type 2 diabetes
• Stomach (abdominal) pain - Indigestion (dyspepsia)
• Bloating of the stomach -
•Burping (eructation)
• Gas (flatulence)
• Reflux or heartburn (also called gastroesophageal reflux disease – GORD) - a disease caused by stomach acid coming up into the tube from your stomach to your mouth
• Hair loss observed in patients treated for weight management
• Feeling tired (fatigue) - Injection site reactions (e.g. itching or redness)
• Fast pulse
• Increased levels of pancreatic enzymes (such as lipase and amylase2 ) in blood.
Uncommon (up to 1 in 100 people)
• Low blood sugar (hypoglycaemia) when tirzepatide is used with metformin for type 2 diabetes. Symptoms of low blood sugar may include headache, drowsiness, weakness, dizziness, feeling hungry, confusion, irritability, fast heartbeat and sweating. Your doctor should tell you how to treat low blood sugar.
• Gallstones - Weight loss observed in patients treated for type 2 diabetes
• Injection site pain
• Increased calcitonin levels in blood
• Cholecystitis (infection of the gallbladder) observed in patients treated for weight management.
Related Treatments for Weight Loss
Frequently asked questions
What is Mounjaro?
Mounjaro is a once-weekly injectable prescription medicine licensed for weight loss and weight maintenance in adults. It contains the active ingredient tirzepatide, which activates both the GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1) receptors.
This dual-action approach helps regulate appetite and blood sugar levels, reducing hunger and cravings so you naturally consume fewer calories over time.How much weight can I lose with Mounjaro?
Mounjaro can deliver up to 20% reduction in body weight when combined with a reduced-calorie diet and increased physical activity. Results vary depending on the dose reached, individual response, and lifestyle factors.
What is the dosing schedule of Mounjaro?
Mounjaro is injected subcutaneously (under the skin) once a week, on the same day each week wherever possible. Treatment begins at a starting dose of 2.5mg, which is then increased in 2.5mg increments every four weeks as tolerated, until the maintenance dose is reached (typically 5mg, 10mg, or 15mg). The injection can be administered at any time of day, regardless of meals. If you need to change your injection day, this is permitted as long as at least threedays have passed since your last dose.
The best places to administer the injection are the upper arm, abdomen, or upper thigh. Each Mounjaro pen comes supplied with six 4mm needles and four wipes for convenience.Who is Mounjaro suitable for?
Mounjaro is usually indicated for adults with:
● A BMI of 30 or above, or
● A BMI of 27 or above alongside at least one weight-related health condition, such as type 2 diabetes, high blood pressure, raised cholesterol, or heart disease
If your BMI if 25 and above, Pharmulous may consider you for treatment after a full clinical review.
Mounjaro is not suitable for everyone. During your consultation, our clinicians will review your medical history and current medications to confirm whether Mounjaro is appropriate for you.How many doses does each Mounjaro pen deliver?
Each Mounjaro pen delivers 4 weekly doses, meaning one pen lasts for 4 weeks.
Do you provide needles and alcohol wipes with Mounjaro pens?
Yes. With each Mounjaro order, you will receive:
- 6 injection needles
- 4 alcohol wipes
These are included to ensure you have everything you need to administer your injections safely.
How often do I use Mounjaro?
Mounjaro is licensed to be used once a week, on the same day each week.
How is Mounjaro administered?
Mounjaro is injected under the skin (subcutaneous injection), usually into the abdomen, thigh, or upper arm. Full instructions are provided with your medication.
How should Mounjaro be stored?
Mounjaro should be stored in a refrigerator between 2°C and 8°C. Do not freeze the medication. If a pen has been frozen, it should not be used.
Can Mounjaro be stored outside the fridge?
Yes. If needed, Mounjaro can be kept at room temperature (below 30°C) for a limited period, in line with the manufacturer’s guidance. Once stored outside the fridge, it should not be returned to refrigeration. Always check the patient information leaflet for full storage instructions.
How is Mounjaro delivered?
Mounjaro is delivered using a temperature-controlled delivery service to help ensure it remains within the required temperature range during transit. Each order is carefully packaged using wool insulation and a frozen gel pack, which helps maintain the appropriate temperature and protect the medication while it is being transported.
Do you offer next-day delivery for Mounjaro?
Temperature-sensitive medications such as Mounjaro are sent via either a guaranteed next-day delivery service or DPD Next Day service to ensure safe and timely arrival.
How do I buy the Mounjaro injection online in the UK?
Ready to try Mounjaro? Buy online through Pharmulous in three simple steps:
1. Answer a few questions about your health and weight loss goals in our secure online consultation
2. A UK-registered clinician reviews your case and, if suitable, issues your prescription the same day
3. Your Mounjaro pen arrives in discreet, plain packaging with free UK delivery included
Ready to get started? Join our online weight loss clinic today and take the first step towards lasting change. To explore all weight loss treatments, visit our dedicated page.
