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Manufactured by Eli Lilly


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Written by Rajive Patel, BPharm
Updated on 26 Mar 2024

What to do if you missed your MOUNJARO ® dose

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About Mounjaro

Mounjaro, manufactured by Eli Lilly, contains tirzepatide as the active ingredient. It is a once weekly injection, recently approved in the UK for weight loss and weight management. Mounjaro is approved for use in adults with a BMI of 30kg/m² or more (obesity), as well as those with a BMI of 27 to 30kg/m², who also have other weight-related health problems. Mounjaro is used in combination with increased physical activity and a reduced-calorie diet.

Tirzepatide works on glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) receptors, increasing the production of insulin in the body, and helping to reduce blood sugar levels. Mounjaro also slows down emptying of the stomach after a meal creating a feeling of fullness, making you feel less hungry.

Mounjaro is available as a weekly self-injectable pen. It is available with a prescription for weight loss and type 2 diabetes. Now Patient offers Mounjaro as a treatment for weight loss only, following an online consultation with a prescribing clinician.

Key facts of Mounjaro

  • For the treatment of weight loss
  • Mounjaro may start to cause weight loss within a few weeks, but can take up to a year to show results
  • Mounjaro has some common side effects which include injection site reactions, nausea, vomiting and constipation
  • It can be dangerous if you take Mounjaro with certain medications. If you’re not sure if it is safe, discuss this with the prescribing clinician

Who is Mounjaro not suitable for?

Mounjaro may not be suitable for some people. To make sure it’s safe for you, speak to the prescribing clinician before taking Mounjaro if you:

  • Are under 18 years of age
  • Are allergic to tirzepatide or any of the ingredients in Mounjaro
  • Have a family history of thyroid cancer or multiple endocrine neoplasia syndrome 2
  • Have kidney problems
  • Have ever had pancreatitis
  • Have diabetic retinopathy or any other eye problems
  • Are pregnant or breastfeeding

How and where to get Mounjaro?

Mounjaro is available only with a prescription. Now Patient does not allow customers to buy Mounjaro directly. Our service is certified, safe and effective, and we only ever treat conditions. If you book a consultation with a prescribing clinician for weight loss, you can discuss if Mounjaro is a suitable treatment option for you.

At the end of the consultation, the clinician will decide if a treatment plan is suitable for you. If it is, the clinician will issue you with a prescription which can then be ordered, paid for and delivered directly to your chosen address by Now Patient.

Dosage and strength for Mounjaro for weight loss

Mounjaro is available as a prefilled pen when used for weight loss, it is available in strengths of 2.5mg/0.5ml, 5mg/0.5ml, 7.5mg/0.5ml, 10mg/0.5ml, 12.5mg, and 15mg/0.5ml Kwikpens.

Information about how to take Mounjaro for weight loss

The typical starting dose of Mounjaro is 2.5mg once a week for 4 weeks, then increased to 5mg once weekly. Dose increases can be made in 2.5mg increments after a minimum of 4 weeks on the current dose. You may inject Mounjaro into the stomach, thigh, or upper arm. Read the patient information leaflet provide with your medication or speak to your healthcare provider for further medical advice.

What happens if you use too much Mounjaro?

If you take more than prescribed, then it can lead to some unpleasant side effects. You should talk to your doctor or reach out to one of our prescribing clinicians, if you have used too much Mounjaro and you experience any of the following side effects:

What are the most common side effects of Mounjaro?

Side effects of Mounjaro are split into common and serious.

In clinical trials common side effects included:

  • Nausea, vomiting
  • Diarrhoea, constipation
  • Low blood sugar (when used with certain diabetes medications)
  • Loss of appetite, indigestion, abdominal pain
  • Dizziness, low blood pressure, tiredness
  • Allergic reactions

Serious side effects include:

  • Pancreatitis (inflamed pancreas)
  • Gallstones
  • Gastroparesis
  • Hypoglycemia (very low sugar levels)
  • If you experience any serious side effects, you should contact NHS 111.

If you experience a serious allergic reaction with the signs shown below you should contact emergency services on 999.

  • Your lips, mouth, throat or tongue suddenly become swollen
  • You’re breathing very fast or struggling to breathe (you may become very wheezy or feel like you’re choking or gasping for air)
  • Your throat feels tight or you’re struggling to swallow
  • Your skin, tongue or lips turn blue, grey or pale (if you have black or brown skin, this may be easier to see on the palms of your hands or soles of your feet)
  • You suddenly become very confused, drowsy or dizzy
  • Someone faints and cannot be woken up

Information about taking Mounjaro at the same time as other medications or herbal supplements

There is not enough evidence to suggest there are any drug interactions between herbal supplements and Mounjaro. In any event, you should let your prescribing clinician know if you are taking any herbal supplements or other prescription drugs.

Why might Mounjaro not work for weight loss?

Certain health factors may mean you do not lose weight when using Mounjaro. Also, as with other medications, there are a number of people, classed as non-responders, for whom Mounjaro will have no effect.

Can Mounjaro taken for weight loss be taken long term?

In clinical trials, Mounjaro was used for 72 weeks (18 months), when used to help reduce body weight. In the U.S., Mounjaro is FDA-approved for long-term use in patients with diabetes. As with all medications however, Mounjaro comes with side effects and has increased risks for certain medical conditions.

Is there a herbal Mounjaro?

No. Herbal Mounjaro does not exist. If you have been marketed such a formulation, it may be fake.

Can women use Mounjaro?

Women can use Mounjaro for the treatment of diabetes or weight loss. It is not recommended however during pregnancy or breastfeeding.

Should I avoid any particular food or drink when taking Mounjaro?

There are no foods known to interact with Mounjaro, however you should avoid certain foods if you want to achieve best results. Avoid high glycaemic fruit and vegetables such as pineapple, mango, and potatoes; food high in sugar, such as sweets, cakes, and fizzy drinks; and fried foods such as burgers, chips, or bacon.

What lifestyle changes can I make to help me with weight loss?

You can modify your lifestyle in a number of ways, these include:

  • Reducing ultra-processed carbs and sweets
  • Drinking more water
  • Increasing physical activity

Alternatives to Mounjaro

Alternatives for the treatment of weight loss include Wegovy injections (semaglutide), or Xenical capsules.


Medical Disclaimer

NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information in this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.

The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.

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