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How long does a Mounjaro pen last?
When you first start Mounjaro
The starting dose of Mounjaro is 2.5mg once a week for 4 weeks. After 4 weeks your doctor will increase your dose to 5mg once a week. Let your doctor know how you’re doing on with the 2.5mg and 5mg doses during your checkup. Your doctor will decide if additional dose increases are needed. Do not change your dose unless your doctor has told you to. The dose options available for Mounjaro are 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg. You can stop increasing when you reach a dose you feel in working for you. For Mounjaro, 5mg, 10mg and 15mg are considered maintenance doses.

Common Mounjaro questions
Is Mounjaro suitable for me?
When you join PrivateDoc we will assess your individual circumstances to see if we think Mounjaro will help with your weight management.
Mounjaro (pronounced mown-JAHR-OH) is an injectable medication designed for adults with type 2 diabetes. It is used in conjunction with a balanced diet and regular exercise to enhance blood sugar (glucose) management. PrivateDoc will evaluate your medical history, current health status, and other factors such as medications you may be taking, to determine if Mounjaro is suitable for you.
How do I use Mounjaro?
Take Mounjaro once a week, selecting a day that suits your schedule. Administer Mounjaro at any time on your chosen day. However, if you wish to change your dosing day, ensure a minimum of 3 days (72 hours) between doses. If a dose is missed, take it within 4 days (96 hours) after the missed dose. If more than 4 days have elapsed, skip the missed dose and resume on your regular day. Avoid taking two doses within 3 days of each other. Consider setting a reminder on your phone for your Mounjaro day, and if you change the day, update your reminder accordingly.
How do I administer my Mounjaro injection?
Administer Mounjaro by subcutaneous injection, either in your stomach (abdomen), thigh, or upper arm, once a week at any time of the day. Change your injection site each week. You may use the same area of your body, but be sure to choose a different injection site in that area. Always use a new pen needle for each injection to help prevent infections and blocked needles. In case of an overdose, promptly contact your healthcare provider or seek medical advice.
What are the possible side effects of taking Mounjaro?
As is the case with any medication, Mounjaro can cause some patients to experience side effects. Some of these are listed below but for the full list please click here for a copy of the patient information leaflet
Very common and common side effects:
- Nausea and/or vomiting
- Gastrointestinal side effects – e.g. diarrhoea, constipation, bloating, indigestion, burping, gas, reflux (heartburn)
- Symptoms of low blood sugar levels (hypoglycaemia) – these can include but are not limited to sweating, dizziness, feeling light headed, headache, feeling drowsy, feeling weak, confusion, mood changes such as feeling irritable
- Allergic reactions (hypersisitivity) – e.g. rash, itching, eczema
- Abdominal pain
- Hair loss
- Tiredness
- Fast pulse
- Injection site reactions – e.g. itching, redness, swelling
- Increased levels of pancreatic enzymes – e.g. lipase and amylase
Uncommon side effects:
- Gallstones
- Gallbladder infection
- Injection site pain
- Increased blood levels of calcitonin
Serious side effects:
- Inflammed pancreas (acute pancreatitis)
- Severe allergic reactions (Anaphylaxis)
How do I store Mounjaro?
Unused pens:
Store unused pens in the refrigerator between 2°C to 8°C
Unused pens may be used until the expiration date printed on the label if the pen has been kept in the refrigerator
Do not freeze.
Used pens:
You may store your pen at room temperature up to 30°C, or in the refrigerator, after you inject the first dose. All pens following first use must be discarded after 30 days.
Keep away from heat.
What if im going on a holiday?
Mounjaro remains viable unrefrigerated for a duration of up to 30 days, provided the temperature does not exceed 86°F (30°C). To safeguard the pen from light exposure, keep it in its original carton.
Keep the container out of the reach of children. Do not recycle your sharps container, follow your community guidelines for the right way to dispose of your sharps disposal container.
How do I dispose of your my Mounjaro pens
Dispose of the pen 30 days after first use or after receiving 4 weekly doses, even if it looks like there may be some liquid left in the device. To dispose of safely, place the pen needles in an approved sharps disposal container immediately after use. If you lack an approved sharps container, use a sturdy household container made of heavy-duty plastic with a puncture-resistant lid. Ensure it is upright, stable, leak-resistant, and appropriately labelled to indicate hazardous waste.
Keep the container out of children's reach, and refrain from recycling the sharps container. Instead, adhere to community guidelines for the proper disposal of sharps containers. The pen device can be disposed of via normal household waste or by returning to your nearest pharmacy if there is still medication inside.
What diet should I follow on Mounjaro?
Whilst on any of our prescription weight loss treatments we recommend following a calorie controlled diet to support your goals. As this can be a confusing area with lots of mixed messaging, we partnered with leading nutritionist Glen Matten to bring to you our very own PrivateDoc diet guide. You can find out more here: PrivateDoc Diet Guide
Where to buy Mounjaro online?
While many online retailers claim to supply genuine medicines, they may be unregulated, provided without a genuine doctor consultation and potentially very dangerous. You can rest assured, PrivateDoc is a fully registered digital health service. We have UK registered doctors that review and assess every consultation. All the medicines we supply are 100% genuine and fully regulated by the Medicines and Healthcare products Regulatory Agency (MHRA).
Mounjaro vs Wegovy, Mysimba & Saxenda
Mounjaro employs a multifaceted approach to enhance weight management. It facilitates the release of insulin in response to elevated blood sugar levels, aids in the removal of excess sugar from the bloodstream, curtails the liver's production and release of excessive sugar, reduces overall food intake, and moderates the speed at which food exits the stomach. Notably, the latter effect gradually diminishes over time. Read more on the differences of medications here
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