Weight Loss Injections in Northern Ireland: Availability, Eligibility and What You Need to Know

Weight loss injections have become one of the most talked about approaches to medical weight management in the UK.

But there is also a considerable amount of confusion around them.

Which medicines are actually licensed for weight management? Who may be suitable? Can you get them through the Health Service in Northern Ireland? And what should happen before treatment is prescribed?

This guide explains the current position.

What Are Weight Loss Injections?

The term weight loss injections is commonly used to describe several prescription medicines that can be used as part of medical weight management.

Many of these medicines work by acting on hormones involved in:

• Appetite
• Feelings of fullness
• Blood glucose regulation
• The body's response to food

They are not ordinary slimming products or supplements.

They are prescription only medicines and should only be used following an appropriate clinical assessment.

Which Weight Loss Injections Are Used in the UK?

Several injectable medicines are licensed in the UK for particular uses.

Medicines licensed for weight management include treatments containing:

• Semaglutide
• Tirzepatide
• Certain forms of liraglutide

Two names that many people will recognise are Wegovy, which contains semaglutide, and Mounjaro, which contains tirzepatide.

However, not every medicine in the wider GLP 1 group is licensed for weight management.

For example, some medicines containing semaglutide are licensed for the treatment of type 2 diabetes rather than weight management.

This is one reason why prescription medicines should not be treated as interchangeable simply because they contain a similar ingredient.

How Do Weight Loss Injections Work?

Different medicines work in slightly different ways.

GLP 1 medicines

Medicines such as semaglutide act on a hormone pathway called GLP 1.

GLP 1 is naturally produced by the body and is involved in appetite and blood glucose regulation.

Dual GIP and GLP 1 medicines

Tirzepatide acts on both GIP and GLP 1 hormone pathways.

These medicines can help some people:

• Feel fuller after eating
• Experience less hunger
• Reduce their appetite
• Reduce some food cravings
• Reduce overall food intake

They are intended to be used alongside changes to diet, physical activity and other lifestyle factors.

They are not designed to replace healthy eating or longer term behaviour change.

Are Weight Loss Injections a Quick Fix?

No.

Prescription weight management medicines can be useful for some people, but they should not be viewed as a quick or cosmetic solution.

The MHRA specifically advises that these medicines are intended for people who meet appropriate medical criteria and not simply for cosmetic weight loss.

A wider weight management approach may include:

• Improving diet quality
• Eating adequate protein
• Increasing physical activity
• Maintaining muscle mass
• Improving sleep
• Reducing excessive alcohol intake
• Behaviour change
• Monitoring progress
• Planning for longer term weight management

Medication is only one part of this process.

Who May Be Considered for Treatment?

Eligibility depends on the specific medicine being considered.

BMI is commonly used as one part of the assessment, but it is not the only consideration.

A clinician may also need to review:

• Current weight and BMI
• Medical history
• Weight related health conditions
• Current medicines
• Previous weight management attempts
• Diabetes or prediabetes
• Cardiovascular health
• Gastrointestinal conditions
• Pregnancy or plans for pregnancy
• Potential medicine interactions
• Previous adverse reactions

Some medicines are licensed for adults with obesity or for adults who are overweight and also have particular weight related health problems.

Meeting a BMI threshold does not automatically mean that prescription treatment is appropriate.

What Health Conditions Can Be Related to Weight?

Examples of weight related conditions considered within current guidance can include:

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

A healthcare professional may also need to consider other aspects of your health when deciding whether treatment is appropriate.

Can You Get Weight Loss Injections on the Health Service in Northern Ireland?

The situation in Northern Ireland is changing.

Historically, people in Northern Ireland have had much more limited access to specialist weight management services and prescription weight management medicines than patients in some other parts of the UK.

Northern Ireland's New Obesity Management Service

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

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

It is intended to provide:

• Specialist weight management support
• Lifestyle support
• Access to weight management medicines where clinically appropriate
• Treatment in accordance with NICE guidance

The Department of Health has said the first phase will focus on people with the highest clinical need.

This is an important development, but it does not mean weight loss injections will immediately become available to everyone who would like them.

Access is expected to be phased.

Can Your GP Prescribe Weight Loss Injections in Northern Ireland?

The introduction of the new service does not necessarily mean that everyone will be able to obtain weight management medication directly from their GP.

Health Service access can depend on:

• NICE recommendations
• Clinical eligibility
• Local prescribing arrangements
• Available specialist services
• Individual medical circumstances
• The rollout of Northern Ireland's new service

If you are concerned about your weight or associated health conditions, your GP can still be an appropriate place to begin the conversation.

What Does NICE Say About Weight Management Medicines?

NICE recognises several medicines as potential options for managing overweight and obesity in adults.

These include:

• Tirzepatide
• Semaglutide
• Liraglutide
• Orlistat

Not all of these medicines are injections.

The exact criteria differ depending on the medicine and the treatment pathway.

NICE also emphasises that medicines for weight management should be used alongside a reduced calorie diet and increased physical activity.

Can Weight Loss Injections Be Prescribed Privately in Northern Ireland?

Private weight management is a separate route from Health Service treatment.

A qualified prescriber can consider whether prescription treatment may be appropriate following an individual assessment.

A proper assessment may include:

• Weight and BMI verification
• Medical history
• Existing health conditions
• Current medication
• Previous weight management treatment
• Potential contraindications
• Pregnancy and contraception where relevant
• Relevant symptoms
• Additional medical information where required

The clinician may decide that:

• Treatment is appropriate
• Another treatment may be more suitable
• Further information is required
• Additional testing is necessary
• Prescription treatment is not appropriate

Requesting a weight loss injection does not guarantee that one will be prescribed.

How Often Are Weight Loss Injections Taken?

This depends on the medicine.

Some commonly used prescription weight management injections are administered once each week.

Other treatments may have different dosing schedules.

Treatment also often begins with a lower dose before being increased gradually where appropriate.

Patients should never increase or alter their dose without following the instructions of the prescribing healthcare professional.

What Are the Common Side Effects?

Side effects vary according to the medicine, but gastrointestinal symptoms are common with GLP 1 and related treatments.

These can include:

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

These symptoms may be more noticeable when treatment begins or when the dose is increased.

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

When Should You Seek Medical Help?

GLP 1 and related medicines have been associated with uncommon but potentially serious side effects.

In January 2026, the MHRA strengthened warnings regarding the risk of acute pancreatitis.

Seek urgent medical advice if you experience:

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

If you experience significant or unusual symptoms while taking prescription treatment, contact an appropriate healthcare professional.

Weight Loss Injections and Pregnancy

GLP 1 medicines used for weight management should not be used during pregnancy.

They should also not be used while trying to become pregnant.

The amount of time a medicine needs to be stopped before a planned pregnancy varies according to the treatment.

This makes it important to discuss pregnancy plans with the clinician responsible for prescribing.

What About the Contraceptive Pill?

There is specific advice for people taking tirzepatide who use oral contraception.

Tirzepatide may reduce the effectiveness of oral contraceptives around the time treatment begins and when the dose is increased.

Current advice includes using an additional barrier method or switching to a non oral method for:

• Four weeks after starting tirzepatide
• Four weeks after each dose increase

Advice differs between medicines, so contraception should form part of the clinical discussion where relevant.

Can You Buy Weight Loss Injections Online?

Prescription medicines can legitimately be provided through regulated online healthcare services.

However, they should never simply be purchased without an appropriate prescription and clinical assessment.

Northern Ireland's Department of Health has previously warned about falsified injectable weight loss medicines being found in circulation.

Be particularly cautious about medicines offered through:

• Social media accounts
• Messaging apps
• Online marketplaces
• Unregulated websites
• Individuals selling unused injection pens
• Sellers who do not require a clinical assessment

There is no guarantee that medicines obtained from an unauthorised source contain what the seller claims.

They may also have been stored incorrectly or be counterfeit.

How Can You Check Whether an Online Service Is Legitimate?

Before using an online weight management provider, look for clear information about:

• Who is providing the clinical care
• How the clinical assessment works
• Who makes prescribing decisions
• Which pharmacy dispenses the medicine
• How follow up and monitoring are provided
• How to contact the service
• What happens if you experience side effects
• How your personal and medical information is protected

Be cautious of any provider that appears to guarantee a prescription before a clinician has assessed you.

Are Weight Loss Injections Suitable for Everyone?

No.

There are circumstances where these medicines may not be suitable or where additional medical assessment is required.

This is why treatment should begin with an assessment of the individual rather than simply selecting a medicine from a list.

The most popular treatment is not automatically the most appropriate treatment.

Which Weight Loss Injection Is Best?

There is no single medicine that is best for everyone.

The appropriate treatment depends on factors including:

• Medical history
• BMI
• Existing health conditions
• Other medicines
• Previous treatment
• Side effects
• Individual response
• Personal circumstances

Different medicines also work in different ways and have different prescribing criteria.

The decision should therefore be made between the patient and an appropriately qualified prescriber.

Weight Loss Injections in Northern Ireland: Where Should You Start?

If you are considering medical weight management, the best starting point is an appropriate health assessment.

Your GP may be particularly useful if you:

• Have unexplained weight gain
• Have significant health conditions
• Have symptoms requiring investigation
• Want to explore Health Service options

Private weight management services provide another route for people seeking an individual assessment outside the Health Service.

Whatever route you choose, prescription treatment should be based on your health, medical history and individual circumstances.

Weight Management Support From Keltoi Wellness

Keltoi Wellness provides a doctor led private weight management service for eligible adults in Northern Ireland.

The process begins with an individual health assessment.

Where prescription treatment is being considered, the prescribing clinician reviews the information provided and decides whether treatment is clinically appropriate.

Completing an assessment does not guarantee that any particular medicine or course of treatment will be suitable.

The final treatment decision remains with the prescribing clinician.

This article provides general information only and does not replace individual medical advice. Prescription weight management medicines should only be used following assessment by an appropriately qualified healthcare professional.

Last updated: August 2026