Mounjaro in Northern Ireland: Availability, Eligibility and What You Need to Know

Mounjaro has become one of the most widely discussed prescription treatments for weight management in the UK.

But if you live in Northern Ireland, understanding where it is available, who may be considered for treatment and how access differs between the Health Service and private care can be confusing.

This guide explains the current position and some of the important things to know before considering treatment.

What Is Mounjaro?

Mounjaro is the brand name for a prescription medicine containing tirzepatide.

It was originally developed for the treatment of type 2 diabetes and is also licensed in the UK for weight management in certain adults.

For weight management, tirzepatide is used alongside changes to:

• Diet
• Physical activity
• Longer term lifestyle habits

Mounjaro is given as a once weekly injection.

How Does Mounjaro Work?

Tirzepatide acts on two naturally occurring hormone pathways known as GIP and GLP 1.

These hormones are involved in:

• Appetite
• Blood glucose control
• Digestion
• The body's response to food

For people using tirzepatide for weight management, it can help to:

• Reduce appetite
• Increase feelings of fullness
• Reduce hunger
• Reduce some food cravings
• Help people eat less

This does not mean that treatment removes the need to consider nutrition, physical activity and longer term lifestyle habits.

Weight management medicines are intended to form part of a wider approach to managing weight.

Who Can Be Considered for Mounjaro for Weight Management?

The UK licence for tirzepatide allows it to be used for weight management in adults with:

• A BMI of 30 or above
• A BMI between 27 and 30 where at least one weight related health condition is also present

Examples of weight related conditions can include:

• High blood pressure
• Abnormal blood fats
• Obstructive sleep apnoea
• Cardiovascular disease
• Prediabetes
• Type 2 diabetes

Meeting these basic criteria does not automatically mean that Mounjaro is suitable for someone.

A prescriber must consider the person's medical history, current medicines, health conditions and individual circumstances before deciding whether treatment is appropriate.

Can You Get Mounjaro on the Health Service in Northern Ireland?

Access in Northern Ireland is changing.

Historically, prescription medicines for obesity have not been widely available through the Health Service because Northern Ireland did not have the specialist weight management infrastructure required to provide them.

That position is now beginning to develop.

Northern Ireland's Regional Obesity Management Service

In June 2026, the Department of Health announced the first phase of Northern Ireland's new Regional Obesity Management Service.

The £5 million service is expected to begin rolling out in early autumn 2026.

It is intended to provide access to:

• Lifestyle support
• Specialist weight management services
• Weight management medication where clinically appropriate
• Treatment in accordance with NICE guidance

The initial phase will focus on people considered to have the highest clinical need.

This means the introduction of the new service should not be interpreted as Mounjaro immediately becoming available to everyone who meets the medicine's licensed criteria.

Access is expected to be phased.

What Does NICE Recommend?

NICE recommends tirzepatide as an option for managing overweight and obesity alongside a reduced calorie diet and increased physical activity in adults who meet its criteria.

For the NICE recommendation, this generally includes:

• An initial BMI of at least 35
• At least one weight related health condition

Lower BMI thresholds may be used for people from certain ethnic backgrounds where the health risks associated with excess weight can occur at a lower BMI.

Licensed Use and Health Service Access Are Different

It is important to understand that NICE criteria for publicly funded treatment and the medicine's UK licence are not exactly the same thing.

A medicine can be licensed for a particular group of patients without automatically being available to every person in that group through the Health Service.

Can Mounjaro Be Prescribed Privately in Northern Ireland?

Yes. Private prescribing provides a separate route to Health Service treatment.

A qualified prescriber can consider whether prescription weight management treatment is clinically appropriate following an individual assessment.

A Proper Assessment May Consider:

• Current weight and BMI
• Medical history
• Existing health conditions
• Current medication
• Previous approaches to weight management
• Relevant symptoms
• Pregnancy and contraception where applicable
• Potential interactions or contraindications
• Whether additional medical information or testing is required

Requesting a particular medicine does not mean that it will be prescribed.

The final decision remains with the prescriber.

Will My GP Take Over a Private Prescription?

You should not assume that your NHS or Health Service GP will take over prescribing simply because treatment has been started privately.

The NI Formulary advises people considering private weight management treatment that GPs cannot automatically take over prescribing through the Health Service.

If you begin treatment privately, you should understand the likely:

• Ongoing treatment costs
• Follow up arrangements
• Prescription arrangements
• Monitoring requirements

Your normal GP continues to have an important role in managing your general health.

How Is Mounjaro Taken?

Mounjaro is administered by injection once each week.

Treatment normally begins at a lower dose and may then be increased gradually where clinically appropriate.

The dose used and whether it should be increased are decisions for the prescribing clinician.

You should use the medicine exactly as instructed by your healthcare professional and follow the patient information supplied with it.

What Are the Common Side Effects?

Like all medicines, tirzepatide can cause side effects.

Some of the most commonly reported effects during weight management treatment involve the digestive system.

These can include:

• Nausea
• Diarrhoea
• Vomiting
• Constipation
• Abdominal discomfort or pain
• Indigestion
• Bloating

These effects can be more noticeable when starting treatment or when the dose is being increased.

Not everyone experiences side effects and their severity can vary considerably between individuals.

When Should You Seek Medical Help?

Tirzepatide has also been associated with less common but potentially serious adverse effects.

The MHRA strengthened warnings in 2026 regarding the risk of acute pancreatitis with GLP 1 and related medicines, including tirzepatide.

Seek Urgent Medical Advice If You Develop:

• Severe and persistent abdominal pain
• Pain that travels through to the back
• Severe abdominal pain accompanied by nausea or vomiting
• Symptoms of a severe allergic reaction

If you are taking treatment and are unsure whether a symptom is significant, contact an appropriate healthcare professional.

Mounjaro and Pregnancy

Mounjaro should not be used during pregnancy.

The MHRA advises that tirzepatide should be stopped at least one month before a planned pregnancy.

If you become pregnant while using tirzepatide, speak to your healthcare professional.

Mounjaro and the Contraceptive Pill

There is specific advice for people using oral contraception.

Tirzepatide may reduce the effectiveness of the contraceptive pill around the time treatment is started or the dose is increased.

Current MHRA advice is to use an additional barrier method of contraception, such as condoms, for:

• Four weeks after starting Mounjaro
• Four weeks after each increase in dose

Alternatively, a non oral method of contraception may be considered after discussion with an appropriate healthcare professional.

This is an important issue to discuss during assessment if it applies to you.

Can You Buy Mounjaro Online?

Mounjaro is a prescription only medicine.

It should only be supplied following an appropriate clinical assessment and a prescription issued by a qualified healthcare professional.

The medicine should then be dispensed by a legitimate pharmacy.

Be Cautious About Medicines Offered Through:

• Social media accounts
• Messaging apps
• Unregulated websites
• Individuals selling unused pens
• Sellers offering treatment without a genuine clinical assessment

The MHRA has warned that medicines obtained from unauthorised sources may be fake, incorrectly stored or otherwise unsafe.

Is Mounjaro Suitable for Everyone?

No.

Prescription weight management treatment is not appropriate for everyone.

There may be circumstances where another approach is more suitable or where further information is needed before a decision can be made.

This is why a clinical assessment is important rather than relying solely on BMI or an online eligibility calculator.

Is Mounjaro a Quick Fix for Weight Loss?

No weight management medicine should be viewed as a quick fix.

Treatment works best as part of a broader approach that may include:

• Appropriate nutrition
• Regular physical activity
• Adequate protein intake
• Maintaining muscle mass
• Good sleep
• Managing alcohol intake
• Behaviour change
• Monitoring progress
• Longer term planning

The aim should be to improve health and develop an approach that can be maintained rather than focusing only on a number on the scales.

Mounjaro in Northern Ireland: The Current Position

For people in Northern Ireland, there are currently two different routes to consider.

Health Service Access Is Developing

Northern Ireland's new Regional Obesity Management Service is expected to introduce access to weight management medicines gradually.

The initial focus will be on people considered to have the greatest clinical need.

Private Treatment Is a Separate Route

People considering private treatment should undergo an appropriate clinical assessment before any prescription is issued.

Whichever route you consider, prescription treatment should be based on your individual circumstances rather than simply choosing a medicine online.

Considering Weight Management Support?

If you are concerned about your weight, your GP can be a sensible starting point, particularly if you:

• Have other health conditions
• Have unexplained symptoms
• Want to explore Health Service support
• Are unsure whether prescription treatment may be suitable

Private weight management services are another option for people who would like an individual assessment outside the Health Service.

Weight Management Support From Keltoi Wellness

At Keltoi Wellness, weight management begins with an assessment of the individual.

Where prescription treatment is considered, decisions about whether treatment is appropriate and which treatment should be used are made by the prescribing clinician following review.

Completing an assessment does not guarantee that prescription treatment will be appropriate.

The final treatment decision remains with the prescribing clinician.

This article is for general information only and does not replace individual medical advice. Mounjaro is a prescription only medicine. Always discuss the benefits, risks and suitability of prescription treatment with an appropriately qualified healthcare professional.

Last updated: August 2026