Mounjaro Frequently asked questions
Everything you need to know about Mounjaro
Mounjaro is a prescription medicine for adults who want to lose weight and improve health problems linked to their weight. We may prescribe it for:
- Adults with obesity: a body mass index (BMI) of 30 or more
- Adults who are overweight: a BMI of 27 or more with at least one weight-related health condition, such as prediabetes or type 2 diabetes, high blood pressure, high cholesterol, obstructive sleep apnoea, heart disease, polycystic ovary syndrome (PCOS) or osteoarthritis
Mounjaro works alongside a reduced-calorie diet and increased physical activity to help you lose weight and keep it off. A prescriber reviews every consultation before treatment is approved.
- Inject once a week, on the same day each week, into your tummy, thigh or upper arm
- You can inject at any time of day, with or without food
- Change the injection site each week
- Your dose starts low and increases gradually to reduce side effects
- Use it alongside a reduced-calorie diet and increased physical activity for the best results
Yes. We can continue your Mounjaro treatment if you send evidence that you've used it within the last 6 weeks. We won't start you on a higher dose than your last confirmed one. If it's been longer, or you've missed several doses, your prescriber may restart you on a lower dose, such as 5 mg or the 2.5 mg starting dose. Acceptable evidence is an invoice or dispensing label from your previous provider that clearly shows:
- Your full name
- The date it was dispensed
- The strength of your last Mounjaro order
Side effects such as nausea, diarrhoea and constipation are most common when you start or increase your dose, and they usually ease over time. To help:
- Increase your dose gradually: only step up when your prescriber agrees. Staying on a dose for longer is fine if you're still losing weight.
- Eat smaller meals: stop when you feel full, and go easy on fatty, fried or very sugary food.
- Drink plenty of fluids: this helps prevent dehydration, especially if you have vomiting or diarrhoea.
- Talk to us: our clinicians can suggest ways to manage side effects and adjust your plan if needed.
Losing weight with Mounjaro isn't just about appearance. Clinical trials have shown improvements in:
- Blood pressure
- Cholesterol and blood sugar levels
- Mobility and physical function
- Quality of life
Even a 5–10% weight loss can lower the risk of type 2 diabetes, heart disease and some cancers.
After you order Wegovy, your clinician will email you asking for:
- BMI photos
- Proof of your previous treatment, such as a dispensing label or invoice dated within the last 6 weeks
If your current BMI is under 25, you may also need evidence of your starting weight, such as a letter from your previous healthcare provider. This helps your clinician choose the right dose and plan a safe switch.
Yes, if you take the contraceptive pill. Mounjaro may make oral contraceptives less effective, especially when you start treatment or increase your dose. Switch to a non-oral method (such as a coil, implant or injection), or use a barrier method such as condoms as well as your pill:
- for 4 weeks after starting Mounjaro
- for 4 weeks after each dose increase
Mounjaro must not be used during pregnancy or breastfeeding. If you're planning a pregnancy, speak to us first: you'll need to stop Mounjaro at least 1 month before trying to conceive. If you become pregnant while taking it, stop and contact us straight away.
Possibly. Interim guidance from the British Menopause Society (BMS) covers women taking HRT alongside weight-loss injections such as Mounjaro. These medicines slow digestion, which may reduce how well tablets are absorbed.
- Oestrogen: your GP or menopause specialist may suggest switching from tablets to a patch, gel or spray, which is absorbed through the skin.
- Progesterone: if you take oral progesterone (such as Utrogestan), your GP may recommend doubling the dose for 4 weeks after you start Mounjaro and for 4 weeks after each dose increase, to keep protecting the womb lining. Alternatively, they may suggest a Mirena coil, which releases progestogen directly into the womb.
Important: never change your HRT dose yourself. Always speak to your GP or menopause specialist first.
Mounjaro Subscribe & Save: your questions answered
Lower prices, one pen at a time, and a prescriber checking in with you every month.
Subscribe & Save at a glance
- Pay less for every pen. Subscribe & Save prices are lower than our one-off prices at every strength.
- No need to reorder. We remind you when your check-in opens, and your next pen follows automatically.
- Spread the cost. You pay for one pen at a time, every 28 days, with no large upfront payment.
- Stay in control. Choose your preferred doses for your next two pens at each check-in.
- Free delivery on every order.
- Our lowest price, with a 6-month commitment. After 6 months, you can cancel any time at no cost.
Here's what you pay per pen with Subscribe & Save compared with a one-off order:
| Strength | One-off price | Subscribe & Save | You save per pen |
|---|---|---|---|
| 2.5mg | £139.99 | £98.99 | £41.00 |
| 5mg | £159.99 | £149.99 | £10.00 |
| 7.5mg | £209.99 | £177.99 | £32.00 |
| 10mg | £239.99 | £197.99 | £42.00 |
| 12.5mg | £259.99 | £211.99 | £48.00 |
| 15mg | £269.99 | £228.99 | £41.00 |
Over a year (13 pens), that's a saving of up to £624. You can see the current price for each strength using the toggle at the top of this page.
How it works
- Choose Subscribe & Save at the top of this page and select your strength.
- Complete your online consultation and upload any photos or evidence we ask for.
- One of our UK prescribers reviews your answers.
- Once approved, your first pen is dispatched with free delivery.
Each cycle is 28 days, counted from your previous order:
| When | What happens |
|---|---|
| Day 14 | Your check-in opens and we email you a link to your patient dashboard. |
| Day 14 to day 24 | You complete your check-in. We'll send you a reminder if you haven't done it yet. |
| By day 26 | Your prescriber reviews your check-in and approves your next pen. |
| Day 28 | Your card is charged and your pen is dispatched. |
Complete your check-in correctly by day 24 and you'll always get the Subscribe & Save price.
Yes. At each check-in, you choose your preferred doses for your next two pens. Your prescriber reviews your answers, takes your preferences into account and confirms the right dose for you. If they recommend staying where you are, they'll explain why.
Your choices also cover you if you ever miss a check-in.
Payments
Checking in is quick and simple, and we'll remind you along the way. We email you when your check-in opens on day 14, and send you reminders before day 24.
If you do miss one, you're covered. Your last check-in already set your preferred dose for your next pen, so we'll send it as normal at the Subscribe & Save price.
Your first check-in is the exception. As there are no earlier preferences to use, we can't send your next pen until you've completed it.
If you miss two check-ins in a row, we'll need you to check in before we can send your next pen.
Checking in by day 24 is part of the terms for the Subscribe & Save pricing. If you check in late and there are no preferences from your last check-in to cover you, we'll send your pen once you've checked in, charged at the one-off price.
Your next pen goes back to the Subscribe & Save price as long as you check in on time.
Flexibility
Yes. Just raise a support ticket from your patient dashboard, call us on 0121 752 7584, or email help@iqdoctor.co.uk.
After your 6-month minimum term, cancelling your subscription is free.
Please note that once a pen has been dispatched, it can't be returned or refunded.
Yes, although Subscribe & Save gives you our most affordable price, with a simple, hassle-free way to get your pen every month.
If you'd rather not have a subscription, our two-pen bundles still offer big savings, and one-off orders are available too. Choose your option using the toggle at the top of this page.
Care and support
*A £20 exit fee applies if you cancel within your first 6 months.
Our Clinical Authors
This page has been written by a registered UK pharmacist and reviewed by our clinical team to ensure it is accurate, clear and reflects current clinical guidance.
Last medically reviewed: 02 November 2026
Last updated: 02 November 2026
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All prescription treatments are subject to clinical assessment and approval.