Mounjaro Injection

Lose Weight Safely and Reliably with this Dual-Action Pen Containing Tirzepatide

Mounjaro Injection
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Mounjaro contains tirzepatide, an active ingredient that mimics GLP-1 and GIP hormones to help regulate appetite and slow gastric emptying.

Mounjaro Product Information

Mounjaro is a prescription weight loss medication containing the active ingredient tirzepatide, which slows down the rate at which food passes from the stomach to the intestines and helps control food cravings by regulating blood sugar levels.

Mounjaro is formulated to be injected once per week and should be used alongside a calorie-restricted diet as part of a healthy lifestyle for optimal results.

Mounjaro contains the active ingredient tirzepatide, which has a dual mechanism of action as it mimics both the GLP-1 and GIP hormones in the body to aid weight loss.

  • Mounjaro activates GLP-1 receptors to slow down gastric emptying and promote insulin secretion when blood sugar levels are elevated. This helps with feeling fuller for longer and regulates food cravings to support weight loss.
  • Mounjaro also activates GIP receptors to further boost insulin secretion and improve fat metabolism, supporting weight loss.

It can take 1–2 weeks up to a few months to experience noticeable weight loss with Mounjaro, depending on factors such as the individual’s diet, lifestyle, starting weight, dosage escalation, tolerability to treatment and how consistent they are with following the prescribed dosage schedule.

Individuals who follow the dosage schedule and maintain a balanced, calorie-restricted diet as part of a healthy lifestyle are likely to experience the desired results from using Mounjaro sooner.

If you stop taking Mounjaro, the effects of the medication on appetite regulation will decrease, which could cause you to overeat and regain some of the weight lost during treatment.

Mounjaro can be highly effective at aiding weight loss when used alongside a balanced diet and healthy lifestyle.

According to research, individuals can lose up to 20.9% of their body weight over 72 weeks when taking a 15mg dose of Mounjaro[1].

The 15mg dose is the maximum dose of Mounjaro and can be built up to by taking the starting dose of 2.5mg and gradually increasing the dosage in line with the dosage schedule and the prescriber’s instructions.

Mounjaro has been approved by the UK Medicines and Healthcare Regulatory Agency as a safe and effective weight loss medication.

To maximise the safety of Mounjaro, please read the Mounjaro Patient Information Leaflet before use and always follow the prescribed dosage schedule.

Mounjaro should be taken once a week at the same time each day, following the prescribed dosage escalation schedule.

You should inject Mounjaro into your upper legs, stomach (abdomen), or upper arms.

We recommend injecting the first dose into the stomach (keeping a 5 cm distance from the belly button) as it has more fat and fewer nerves, making it easier and less painful to administer the dose.

Moreover, you should rotate between injecting the stomach (abdomen), upper arms and upper legs each week to reduce the risk of skin irritation.

The starting dose of Mounjaro is 2.5mg injected once per week for four weeks.

If you do not experience side effects from taking the starting dose of the treatment, then you can increase your dose to 5mg per week for weeks 5 to 8.

Thereafter, you can continue to increase the dose in line with the table below, provided you are cleared to do so by a doctor or pharmacist.

Weeks Dose
Week 1–4 2.5mg
Week 5–8 5mg
Week 9–12 7.5mg
Week 13–16 10mg
Week 17–20 12.5mg
Week 21 onwards 15mg

Always take Mounjaro according to the dosage schedule and instructions provided to you by the prescriber.

Mounjaro FAQs

Mounjaro and Wegovy are two different injectable weight loss medications with differing mechanisms of action.

Wegovy contains the active ingredient semaglutide, which mimics a hormone called GLP-1 to help regulate appetite and slow down stomach emptying.

Wegovy also improves insulin sensitivity, stabilising blood glucose levels and preventing sudden spikes and crashes to prevent excessive hunger signalling by the brain.

Mounjaro contains a different active ingredient, tirzepatide, which also mimics GLP-1, in addition to mimicking another hormone known as GIP to further enhance insulin release by the body.

Mounjaro is not the same as Ozempic. While both medications are prescribed for weight loss, they have different active ingredients and mechanisms of action.

Mounjaro contains tirzepatide, an active ingredient that mimics the gastric inhibitory polypeptide (GIP) and glucagon-like peptide 1 (GLP-1) hormones. In contrast, Ozempic contains semaglutide, an active ingredient that mimics the GLP-1 hormone, but not the GIP hormone.

Orlistat is a clinically proven oral weight loss treatment that reduces total calorie intake by limiting the absorption of dietary fat.

In contrast, Mounjaro is a weight loss injection that works differently by stabilising blood sugar levels to reduce appetite and slowing stomach emptying, helping you feel fuller for longer.

Mounjaro and Zepbound are both medications containing the active ingredient tirzepatide, which mimics hormones to make the body feel fuller and reduce appetite.

Zepbound is the US name for the same weight loss medication, whereas in the UK, tirzepatide is licensed under the name Mounjaro.

The medications function in the same way and are both prescribed for weight loss and metabolic regulation.

Mounjaro can result in a loss of body fat, which may affect menstrual cycles in some women. This is due to the fact that menstrual cycles are affected by levels of the hormone oestrogen, which is produced by fatty tissues in the body.

Women who experience changes in menstrual cycles from taking Mounjaro are recommended to consult a doctor for further advice.

It is not advisable to take Mounjaro (tirzepatide) during pregnancy, as there is limited data on its safety and impact on developing children.

If you are pregnant or intend to become pregnant and have taken Mounjaro, discuss your usage of this medication with your doctor immediately.

1. Jastreboff et al. (2022). Tirzepatide once weekly for the treatment of obesity. New England Journal of Medicine, 387(3), pp. 205-216. https://doi.org/10.1056/NEJMoa2206038

Mounjaro Injection Overview

What are the side effects of Mounjaro?

Like any medication, Mounjaro can cause side effects, although not everyone will experience them.

Serious Side Effects

The serious side effects of Mounjaro can be categorised as being uncommon or rare.

Uncommon (may affect up to 1 in 100 people):

  • Inflamed pancreas (acute pancreatitis) - symptoms may include severe and long-lasting pain in your stomach (the pain may move to your back). Seek immediate medical attention if you experience any of these symptoms.

Rare (may affect up to 1 in 1,000 people):

  • Severe allergic reactions (anaphylactic reactions, angioedema) – seek immediate medical attention and inform your doctor straight away if you experience symptoms such as breathing problems, swelling of face, lips, tongue, and/or throat with difficulty swallowing, wheezing, fast heartbeat, pale and cold skin and feeling dizzy or weak.

Other Side Effects

The other side effects of Mounjaro can be categorised as being very common, common or uncommon.

Very Common (may affect more than 1 in 10 people):

  • Nausea*
  • Diarrhoea*
  • Vomiting*
  • Stomach (abdominal) pain
  • Constipation
  • Low blood sugar (hypoglycaemia) when tirzepatide is used for the treatment of type 2 diabetes with medicines that contain sulphonylurea and/or insulin. If you are using 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.

*These side effects are usually not severe and tend to subside over time as your body adjusts to the treatment.

It is important to be aware that diarrhoea or vomiting can lead to dehydration, which may be serious. Make sure to stay hydrated during your treatment and contact your GP or doctor if you experience these symptoms.

Common (may affect up to 1 in 10 people):

  • Allergic reactions (hypersensitivity) – symptoms include rash, itching and eczema
  • Feeling dizzy
  • Low blood pressure
  • Decreased appetite
  • Indigestion (dyspepsia)
  • Bloating of the stomach
  • Burping
  • Gas (flatulence)
  • Reflux or heartburn (also known as gastro-oesophageal reflux disease (GORD))
  • Hair loss
  • Fatigue
  • Injection site reactions (e.g. itching or redness)
  • Increased levels of pancreatic enzymes (such as lipase and amylase) in blood
  • Increased calcitonin levels in the blood
  • Gallstones
  • 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 may include headache, drowsiness, weakness, dizziness, feeling hungry, confusion, irritability, fast heartbeat and sweating.

Uncommon (may affect up to 1 in 100 people):

  • Injection site pain
  • Fast pulse
  • Infection of the gallbladder (cholecystitis)
  • Changes in sense of taste
  • Changes in skin sensation
  • A delay in the emptying of the stomach
  • Low blood sugar (hypoglycaemia) when tirzepatide is used with metformin for type 2 diabetes. Symptoms may include headache, drowsiness, weakness, dizziness, feeling hungry, confusion, irritability, fast heartbeat and sweating.

 Information Leaflet

Always read the patient information leaflet before commencing treatment.

Important: We advise you to always read the patient information leaflet inside the medication box, as the generic medication may not always entirely match the patient information leaflet listed. Please contact us if you have any questions.

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Your privacy is important to us. That’s why we’ve taken every step to ensure your order arrives in the most discreet way possible.

From start to finish, your purchase is handled with complete confidentiality. You’ll never see our brand name on your bank statement, bills or delivery papers.

All our parcels are sent in plain, unmarked packaging with no logos, no product descriptions and no indication of what’s inside.

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