Weight loss injections have become an established part of obesity treatment in Ireland for people who have struggled with traditional diet and exercise approaches. GLP-1 receptor agonist medicines - active substances such as semaglutide, liraglutide and tirzepatide, each sold under various brand names - are licensed in Ireland and are prescribed through GPs and private clinics as part of medically supervised weight management.
This guide explains how these medicines work, who they are suitable for, what the treatment involves, and the side effects and risks to weigh up — so you can have a better-informed conversation with a doctor.
GLP-1 (glucagon-like peptide-1) receptor agonists are a class of injectable medications originally developed for type 2 diabetes management. Researchers discovered that these medications also produce significant weight loss effects, leading to their approval for obesity treatment.
These medications work by mimicking a natural hormone called GLP-1 that your body produces after eating. When you inject a GLP-1 medication, it:
The result is that patients naturally eat less without the constant hunger and cravings that often derail traditional diets.
Semaglutide for weight management received European Medicines Agency (EMA) approval in 2022 and is available in Ireland on prescription. The products containing it, and their approved product information, are listed on the HPRA register.
How It Works: Semaglutide for weight management is a once-weekly injection that mimics the GLP-1 hormone. The dose licensed for weight management is higher than the doses used in type 2 diabetes and is specifically optimised for weight loss rather than blood sugar control.
Dose Escalation: Treatment starts at a low dose and is increased gradually over several months to minimise side effects. The schedule is set and monitored by your prescribing doctor and is detailed in the patient information leaflet.
Cost and Reimbursement: Semaglutide prescribed for weight management is not covered by the medical card or most private health insurance plans. Your pharmacist can advise on current pricing.
Clinical Results: In the STEP clinical trials, participants taking semaglutide 2.4mg achieved:
Liraglutide was the first GLP-1 medicine approved specifically for weight management in Ireland. It requires daily injections.
How It Works: Like semaglutide, liraglutide activates GLP-1 receptors to reduce appetite and slow gastric emptying. However, because liraglutide has a shorter half-life than semaglutide, it requires daily rather than weekly administration.
Dose Escalation: Treatment also starts at a low dose and is increased gradually over the first weeks, following a schedule set by your prescribing doctor.
Cost and Reimbursement: Liraglutide prescribed for weight management is generally not covered by the medical card. Your pharmacist can advise on current pricing.
Clinical Results: In the SCALE clinical trials, participants taking liraglutide achieved:
Tirzepatide is the most recently authorised injectable weight management medicine available in Ireland. It received EMA approval for type 2 diabetes in 2022, with weight management approval following.
How It Works: Tirzepatide is unique because it is a dual-action medication that activates both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide) receptors. This dual mechanism appears to produce even greater weight loss than GLP-1-only medications.
Dose Escalation: Tirzepatide is a once-weekly injection. Treatment starts at a low dose and is increased stepwise over several months, with the maintenance dose based on individual response and set by the prescribing doctor.
Cost and Reimbursement: Tirzepatide is currently available primarily through diabetes prescriptions, though it is increasingly prescribed for weight management. Your pharmacist can advise on current pricing.
Clinical Results: In the SURMOUNT clinical trials, tirzepatide achieved:
Understanding how these medications work can help you make an informed decision and set realistic expectations.
GLP-1 is a naturally occurring hormone released by your intestines after eating. In healthy individuals, GLP-1:
When you inject a GLP-1 medication, you are providing your body with a much higher, more sustained level of GLP-1 activity than what naturally occurs. This amplified signal:
Tirzepatide's additional GIP activity enhances weight loss through mechanisms that are still being studied. GIP appears to:
This dual action may explain why tirzepatide produces greater weight loss than GLP-1-only medications.
Weight loss injections are prescription-only medications in Ireland. To be eligible, you typically need to meet specific criteria.
Standard eligibility:
If your BMI is between 27-30, you may qualify if you have:
These medications are not suitable for everyone. Contraindications include:
Your doctor will conduct a thorough medical assessment before prescribing.
There are several pathways to access weight loss injections in Ireland.
Many Irish GPs now prescribe weight loss injections. The process typically involves:
Pros: Continuity of care, access to your full medical history, potentially lower consultation costs Cons: Some GPs may not be familiar with these medications, limited appointment availability
Online consultations with Irish-registered GPs offer a convenient way to access weight loss treatment. The process typically includes:
Pros: Convenient, same-day appointments available, no travel required Cons: Physical examination limitations (though BMI and blood pressure can often be self-measured)
Specialist weight loss clinics in Dublin, Cork, Galway, and other cities offer comprehensive programmes including:
Pros: Specialised expertise, comprehensive support, multidisciplinary approach Cons: Higher costs for the initial assessment and ongoing programme
Understanding how the costs of weight loss injection treatment arise helps you plan appropriately.
These medicines are relatively expensive, and pharmacy prices vary by product and dose. Because treatment is usually long-term, the medication is the largest ongoing cost. Your pharmacist can tell you the current price of any medicine you are prescribed.
Consultation fees vary by setting: standard GP visits, online GP consultations and private clinic assessments each have different fee structures, and follow-up appointments are usually less expensive than an initial assessment. Check current fees with the service you choose.
Because the medication is taken continuously and regular medical review is part of safe treatment, it is sensible to budget for both the ongoing monthly medication cost and several follow-up consultations per year.
Medical Card: Weight loss injections are generally not covered by the GMS (medical card) scheme when prescribed for weight loss. GLP-1 medicines may be covered when prescribed for type 2 diabetes, where different products licensed for diabetes are typically used.
Private Health Insurance: Most Irish health insurers do not cover weight loss medications. However, some policies may cover:
Always check your policy documents or contact your insurer directly.
Like all medications, GLP-1 weight loss injections can cause side effects. Most are mild and improve over time.
Gastrointestinal effects are the most common:
Tips to minimise GI side effects:
Seek medical attention immediately if you experience:
GLP-1 medications have been used for diabetes management since 2009 (liraglutide) and 2017 (semaglutide), so liraglutide in particular carries well over a decade of clinical experience. Ongoing studies continue to monitor for:
Setting realistic expectations is crucial for long-term success.
Weeks 1-4:
Months 1-3:
Months 3-6:
Months 6-12:
Beyond 12 Months:
Clinical trial results represent averages, and individual results vary. Factors affecting your results include:
Research shows that weight regain typically occurs when treatment is discontinued. This is because:
For this reason, many patients continue treatment long-term, though some may maintain results with lifestyle changes alone.
Traditional lifestyle approaches produce average weight loss of 3-5% of body weight. GLP-1 medications significantly exceed this, while also making dietary changes easier to sustain.
Orlistat works by blocking fat absorption, producing average weight loss of 3-4%. It is considerably less effective than GLP-1 medications and causes unpleasant fatty stool side effects.
Bariatric surgery (gastric bypass, sleeve gastrectomy) produces weight loss of 25-35%, exceeding even tirzepatide. However, surgery involves:
GLP-1 medications offer a non-surgical alternative with similar (though slightly lower) results.
Most patients need ongoing treatment to maintain weight loss. Some may successfully transition to lifestyle-only maintenance, but this requires careful monitoring. Your doctor will help determine the best long-term approach for you.
These medications are approved for people with BMI of 30 or above, or BMI of 27 or above with weight-related conditions. Using them purely for cosmetic weight loss in people with healthy BMI is not recommended and may not be prescribed.
Studies show most people regain weight within 1-2 years of stopping treatment. This does not mean the treatment "failed" - it reflects the chronic nature of obesity, similar to how blood pressure returns when stopping antihypertensive medication.
Moderate alcohol consumption is generally acceptable, but be aware that:
Yes. While these medications significantly reduce appetite, maintaining a balanced diet and regular physical activity enhances results and overall health. Exercise is particularly important for preserving muscle mass during weight loss.
Current evidence supports long-term use, with semaglutide and liraglutide having over a decade of safety data from diabetes use. However, as with any chronic medication, ongoing monitoring is important.
Yes. While obesity affects both genders, men are sometimes less likely to seek treatment. GLP-1 medications are equally effective for men, with similar eligibility criteria applying.
Approximately 10-15% of patients are "non-responders" who do not achieve meaningful weight loss. If one medication is not effective, your doctor may recommend:
Combining GLP-1 medications with other approaches should only be done under medical supervision. Some combinations (like with other diabetes medications) require careful monitoring to prevent hypoglycaemia.
All GLP-1 medications require refrigeration (2-8 degrees Celsius) before first use. After starting a pen, most products can be kept at room temperature for a limited period - roughly three to four weeks depending on the product. Check the patient information leaflet for the exact storage instructions for your medicine.
Never freeze these medications.
All GLP-1 medications work within the first few weeks, but tirzepatide tends to produce the most rapid and substantial weight loss due to its dual GIP/GLP-1 mechanism. However, the "best" medication depends on your individual circumstances, medical history, and preferences.
Yes, and in fact these medications can be particularly beneficial. Semaglutide, liraglutide and tirzepatide are all also approved for type 2 diabetes at appropriate doses. Your doctor will advise on the best choice and may need to adjust other diabetes medications.
While no foods are strictly prohibited, you may find that:
Most patients find their food preferences shift toward lighter, healthier options.
All three medications come in pre-filled pen devices designed for self-injection into the abdomen, thigh or upper arm. The devices differ from each other in how they are prepared and used, so follow the patient information leaflet for your specific medicine and ask your pharmacist to walk you through the technique the first time — they can show you exactly how your pen works and how to dispose of needles safely in a sharps bin.
If you are considering weight loss injections, here is how to move forward:
Calculate your BMI and consider whether you have any weight-related health conditions. A doctor can confirm whether you meet the eligibility criteria.
Before your consultation, prepare:
You can discuss eligibility and treatment options with:
During your consultation, discuss:
Deciding whether to pursue medical weight-loss treatment can stir up difficult feelings about food, weight and self-worth — especially if you have a history of disordered eating, which is one of the reasons a doctor will ask about it before prescribing.
If you experience low mood or thoughts of self-harm while on any of these medicines, stop guessing about the cause and speak to a doctor promptly.
Weight loss injections represent a significant advancement in obesity treatment, offering Irish patients a medically supervised path to sustainable weight loss. For people who meet the clinical criteria, these medicines can support weight loss that was previously difficult or impossible through diet and exercise alone.
Remember that these medications work best as part of a comprehensive approach including healthy eating, regular physical activity, and ongoing medical support. They are not "miracle drugs" but rather tools that can make meaningful weight loss achievable for those who qualify.
Speak to your GP if you want to understand whether medical weight-loss support is right for you. A doctor can assess your eligibility, discuss the options, and make sure any treatment takes place with proper medical supervision.
This article was prepared by the GetYourGP Editorial Team. The information provided is for educational purposes and should not replace personalised medical advice. Always consult with a healthcare professional before starting any new medication.
This article was reviewed by Dr. Fasi Ullah, a General Practitioner registered with the Irish Medical Council. The information provided is for educational purposes and does not replace personalised medical advice.
Editorial
The GetYourGP Editorial Team prepares informational health content for GetYourGP.
Medically reviewed by Dr. Fasi Ullah on 3 August 2026
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