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GLP-1 weight-loss injections have transformed obesity treatment in Ireland. This guide compares every option side by side, effectiveness, cost, eligibility, and how to get started safely.
Weight-loss injections are a class of prescription medicines known as GLP-1 receptor agonists (and, in Mounjaro's case, a dual GIP/GLP-1 agonist). They mimic natural gut hormones that control appetite and fullness. The result: you feel satisfied sooner, stay full longer, and naturally eat less, making sustained weight loss far more achievable when combined with changes in diet and activity.
They are not a quick fix or a substitute for healthy habits, but for people living with obesity or weight-related health conditions, they can be a genuinely effective medical tool.
| Brand | Active ingredient | Frequency | Licensed for weight loss? |
|---|---|---|---|
| Mounjaro | Tirzepatide | Weekly | Yes |
| Wegovy | Semaglutide | Weekly | Yes |
| Saxenda | Liraglutide | Daily | Yes |
| Ozempic | Semaglutide | Weekly | No, type 2 diabetes only |
Important: Ozempic is frequently asked about for weight loss, but it is licensed in Ireland for type 2 diabetes, not weight management. Wegovy is the semaglutide product licensed for weight loss.
| Mounjaro | Wegovy | Saxenda | |
|---|---|---|---|
| Ingredient | Tirzepatide | Semaglutide | Liraglutide |
| How it works | Dual GIP + GLP-1 | GLP-1 | GLP-1 |
| Injection | Once weekly | Once weekly | Once daily |
| Avg. weight loss (trials) | ~15 to 20% | ~15% | ~8 to 10% |
| Typical 2026 monthly cost | €150 to €300+ | €180 to €350 | €200 to €280 |
On average, tirzepatide (Mounjaro) has produced the largest weight reductions in trials, followed by semaglutide (Wegovy), with liraglutide (Saxenda) lower, and Saxenda also requires a daily rather than weekly injection. That said, the right medicine is the one that suits your health profile, tolerance, and budget, as confirmed by a prescriber.
None of these medicines is currently reimbursed by the HSE for weight loss, so they are paid for privately.
Watch out for counterfeits. Demand for these medicines has fuelled a black market. Only ever buy from a regulated Irish pharmacy following a genuine prescription. Pens sold without an assessment, or shipped from unverified overseas sellers, may be fake and dangerous.
Weight-loss injections are generally suitable for adults with:
They are not suitable for pregnancy or breastfeeding, or for people with certain medical histories. A prescriber's assessment determines suitability.
Read our dedicated guides to Mounjaro in Ireland and Wegovy in Ireland for more detail.
SmartScripts offers fast, Irish-regulated online assessments for weight-loss injections from €20. Complete a short questionnaire, and a registered prescriber will confirm which option, if any, is right for you.
Medication works best as part of a wider plan. To maximise and maintain your results:
Medical disclaimer: This article is for general information only and is not medical advice. Prescription-only medicines must be assessed and prescribed by a registered doctor or prescriber.
Not currently for weight loss. These medicines are private-pay when prescribed for weight management, as they are not on the HSE reimbursement list for that use.
Not in the way people often assume. Ozempic contains semaglutide, the same active ingredient as Wegovy, but it is licensed in Ireland for type 2 diabetes, not weight management, and is dosed differently. Wegovy is the semaglutide product licensed and dosed specifically for weight loss. A prescriber will only issue the medicine that is licensed and appropriate for your situation, so if your goal is weight loss, the relevant semaglutide option is Wegovy rather than Ozempic.
In clinical trials, average weight loss ranged from around 8 to 10% of body weight with Saxenda, to about 15% with Wegovy, to roughly 15 to 20% with Mounjaro at higher doses, always combined with changes to diet and activity. These are averages: some people lose more and some less, depending on the medicine, dose, how they respond, and how consistently they make lifestyle changes alongside it. It's also worth noting that weight tends to return if treatment is stopped without sustained lifestyle change, so these medicines work best as part of a long-term plan rather than a short course.
The most common side effects are gastrointestinal and usually ease as your body adjusts: nausea (especially early on or after a dose increase), diarrhoea or constipation, reduced appetite, indigestion and tiredness. Starting at a low dose and increasing gradually (titration) is designed to minimise these. Rarer but more serious risks include pancreatitis and gallbladder problems, and these medicines aren't suitable for everyone, for example, in pregnancy or with certain personal or family medical histories. This is exactly why a proper assessment and follow-up reviews matter, and why buying without them is risky.
Use a regulated service with Irish-registered prescribers, complete a proper medical assessment, and only obtain your medication from a licensed pharmacy. Never buy from sellers who skip the assessment or ship from unverified sources, as counterfeit GLP-1 pens are a real and dangerous problem. The safe route is straightforward: complete a short online questionnaire, get reviewed by a prescriber (often the same day), and if you're eligible start at the lowest dose with scheduled follow-ups to titrate up and monitor your progress.
Compare Mounjaro, Wegovy, and Saxenda: effectiveness, cost, eligibility, and how to get a prescription safely online.
Disclaimer: All prescriptions are issued by Irish-registered doctors, subject to clinical suitability. Medication names mentioned are trademarks of their respective owners.
Disclaimer: All medicine names and trademarks are the property of their respective owners. SmartScripts does not claim any affiliation with or endorsement by the trademark holders.
