Mounjaro is a weekly injection pen that contains tirzepatide. In the UK, it’s used for weight loss and weight maintenance in adults, alongside a reduced-calorie diet and increased physical activity. It comes in multiple strengths (from 2.5mg up to 15mg) and is injected under the skin (typically stomach, thigh, or upper arm).

If you’re looking to start treatment through MedCare, the next step is the online consultation on the product page, where a clinician reviews your answers before any prescribing decision is made.

Go to: Mounjaro weight loss injection pen

Table of Contents

What Mounjaro is (tirzepatide) and what it’s used for

Mounjaro (tirzepatide) is a prescription medicine. While it’s also used for type 2 diabetes, the UK patient information confirms it is also used for weight loss and weight maintenance in adults.

Mounjaro for weight management is supplied as a pre-filled injection pen and is taken once weekly. 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg strengths.

How Mounjaro supports weight loss (high-level)

Mounjaro’s active ingredient, tirzepatide, helps weight management largely by reducing appetite and cravings and helping you feel fuller for longer. This makes it easier to stick to a calorie deficit over time.

Important: medication works best when it’s paired with:

a reduced-calorie eating pattern
consistent activity
habits that make the plan sustainable (sleep, routine, stress control)

That’s why weight loss services typically include structured support alongside the prescription.

Who can use Mounjaro for weight loss in the UK

Eligibility can vary depending on whether you’re accessing treatment privately or via NHS pathways, but UK guidance is very clear about the core criteria for weight management.

NICE guidance (high-level)

NICE recommends tirzepatide as an option for managing overweight and obesity alongside diet and activity for adults only if they have:

BMI ≥ 35 kg/m², and
at least 1 weight-related comorbidity

NICE also states a lower BMI threshold (usually reduced by 2.5 kg/m²) can be used for people from certain ethnic backgrounds (including South Asian, Chinese, other Asian, Middle Eastern, Black African, and African-Caribbean groups).

Why clinics ask about ethnicity, height, and weight

On MedCare’s consultation, you’ll see questions about ethnicity, height, and weight because BMI thresholds and risk can differ across groups and because BMI is used for eligibility decisions.

You’ll also be asked if you’re a new or repeat customer and whether you’ve used other injections before this helps clinicians prescribe safely and avoid dosing mistakes.

To explore options and start the clinical review process, use the Weight Loss clinic hub or go directly to the Mounjaro weight loss injection pen page.

Mounjaro doses explained (2.5mg–15mg) + typical step-up

Mounjaro is available in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg.

Most people begin on a lower starting dose and step up gradually. A common pattern described by UK providers is: 2.5mg weekly for 4 weeks, then 5mg weekly for 4 weeks, with further increases if needed and tolerated.

Dose overview table (guide-level, not a substitute for prescribing)

Strength	Where it usually fits
2.5mg	Typical starting dose (first month for many patients)
5mg	Early step-up dose after starting period (if tolerated)
7.5mg – 10mg	Mid-journey doses when more effect is needed and side effects are manageable
12.5mg – 15mg	Higher doses used when clinically appropriate, based on response/tolerance

Why dose increases are gradual: stepping up helps reduce side effects (especially stomach-related symptoms) and gives your body time to adjust.

On MedCare’s product page, you can see the full strength range (2.5mg–15mg) available as options.

What results to expect (timeline, ranges, plateaus)

When people start noticing changes

Many people first notice:

reduced appetite / fewer cravings
earlier fullness
more control over portion sizes

Because dosing often starts low and increases gradually, weight loss may feel slower in the first few weeks for some people especially if side effects temporarily reduce food intake or alter routine.

Why plateaus can happen

A plateau usually means your calorie balance has drifted (often without you noticing). Common reasons include:

portion sizes creeping up as you feel better
“liquid calories” (sweet drinks, coffees, alcohol)
reduced daily movement due to fatigue or busy routines
poor sleep increasing hunger signals

This guide page is meant to help you understand the journey; later cluster pages can go deeper into “plateau fixes” and structured plans.

Side effects overview: what’s common vs what needs urgent care

Mounjaro can cause side effects, and many are gastrointestinal (gut-related). The official patient leaflet includes guidance about use and storage and explains it is used for weight loss/maintenance; like other medicines in this category, stomach symptoms are a frequent reason people struggle early on.

Commonly reported (often improves with time)

nausea
reduced appetite
constipation or diarrhoea
heartburn/indigestion
tiredness in the first weeks

Get urgent medical help if you have red-flag symptoms

Seek urgent care if you develop symptoms that feel severe or unusual, such as:

severe, persistent abdominal pain (especially with vomiting)
symptoms of a serious allergic reaction
signs of dehydration that don’t improve with fluids

NHS vs private access in the UK (what’s different)

NHS England access (important reality check)

NHS England states that from 23 March 2025, tirzepatide (Mounjaro®) for weight management may be prescribed only if prescribed by a specialist weight management service such as Medcare Healthclinic & Pharmacy, where a healthcare professional decides it’s the right treatment.

NICE’s guidance page also notes that NHS England published interim commissioning guidance with prioritisation and phased implementation details.

Private care pathway

Private providers may offer treatment based on clinical suitability via an online assessment. On MedCare’s product page, the consultation is mandatory, and it states answers are read by a prescriber before a decision is made.

How to start safely (consultation, measurements, lifestyle plan)

If you start through MedCare, expect these steps (as shown on the product page flow):

choose strength
complete the online consultation
add to basket and checkout (after clinical review)

You’ll also be asked to provide verification items like ID and a full-body photo with the date to support safe prescribing decisions.

What to prepare before you begin

your current weight and height (for BMI)
a short list of medical conditions and medications
your previous weight-loss treatments (if any)
a realistic weekly routine (meals + movement + sleep)

Simple lifestyle baseline (keeps side effects lower and results higher)

prioritise protein with meals
aim for fibre gradually (not suddenly)
drink water consistently across the day
keep meals smaller early on (helps nausea)

FAQs

Is Mounjaro the same as Wegovy or Ozempic?

No. They are different medicines, used in similar treatment areas, but with different active ingredients and prescribing considerations.

Do I have to follow a diet while using Mounjaro?

Yes. UK guidance frames tirzepatide for weight management as used alongside a reduced-calorie diet and increased physical activity.

What strengths does the Mounjaro pen come in?

In the UK, the MHRA lists the pen strengths as 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and 15mg.

Can I get Mounjaro on the NHS?

NHS England notes access is tied to specialist weight management services, with phased implementation.