GLP-1 for Weight Loss: How the “Weight-Loss Injections” Work – and Who They’re For in Switzerland

The key points

• GLP-1 is not a “weight-loss miracle” but a medical tool for obesity and severe overweight – with real benefits and real side effects.
• In Switzerland these medications are prescription-only; health insurance covers them only under strict conditions (as of 2026).
• The first step isn’t to “buy” – it’s to find out whether a supported treatment makes sense for you at all.

If you’ve ever tried seriously to lose weight, you know the feeling. You eat more mindfully, you move more – and yet, sooner or later, your body pulls back in the old direction. That’s not weak willpower. Holding a weight is, to a large degree, biology: hormones, hunger, metabolism.

This is where GLP-1 medications come in – the “weight-loss injections” everyone has been talking about for months. This article explains how they work, who they’re meant for, what risks come with them, and what applies in Switzerland in concrete terms, including cost and health insurance. So you can judge for yourself whether a medical assessment is worth it for you.

What are GLP-1 medications – the substance class behind the “weight-loss injections”?

GLP-1 stands for “glucagon-like peptide-1”, a hormone your gut releases after you eat. GLP-1 medications are substances that mimic this hormone. The technical name is GLP-1 receptor agonists.

Within this class there are different active substances: some act only on the GLP-1 receptor (the active substance semaglutide), others also act on a second receptor called GIP (the active substance tirzepatide), which can strengthen the effect. These medications are injected.

All of these are prescription-only [7]. This is information about a substance class, not product advertising – which substance (if any) is suitable is always decided by a doctor after an assessment, not by an online shop.

Using a medical treatment is not cheating. Obesity is a recognised chronic disease. Getting medical help with it is no more “cheating” than wearing glasses to see.

How do GLP-1 medications work in the body?

Picture GLP-1 as an interpreter between your gut and your brain: it translates “I’ve eaten” into “you’re full” – earlier and more clearly than usual.

In practice, the substances act in three places:

• Appetite regulation: they act on brain regions that govern hunger and reward. That lowers appetite and quiets what many call “food noise” – the constant mental loop around food.
• Slower stomach emptying: food stays in your stomach longer, so you feel full for longer.
• Better insulin response: they prompt the pancreas to release more insulin when blood sugar is high – originally the reason these substances were developed for type 2 diabetes.

The first human study to describe GLP-1 as an effective “satiety hormone” actually dates back to 1987 (Kreymann et al., The Lancet) [1]. For discovering and developing this substance class, the researchers involved received the Lasker–DeBakey Award in 2024. This isn’t a passing fad – it’s nearly four decades of research.

What does that mean day to day – and do I have to inject myself?

Many people on GLP-1 treatment describe:

• less hunger and feeling full sooner,
• fewer cravings and urges,
• a quieter “food noise” (the constant mental loop around food eases off),
• and, as a result, smaller portions without constantly denying themselves.

This is the point an FMH doctor often makes in consultations: “The medication doesn’t take the weight away. It makes it easier to change how you eat – and changing how you eat is what ultimately drives the weight loss.” (Illustrative quote – to be confirmed by a care doctor before publication.)

And the injection? Most of these substances are injected under the skin once a week – with a thin, pre-filled pen, usually into the abdomen or thigh. The needle is very fine; after a short briefing, many find it straightforward.

What do the first weeks feel like? The dose is deliberately started low and raised slowly, so your body gets used to it. During this early phase, mild gastrointestinal complaints are the most common (see Section 7); the weight curve is usually slow and quiet at first – that’s normal and intended.

Who is a GLP-1 treatment for – and who isn’t it for?

In Switzerland, a GLP-1 treatment for weight regulation (the active substance semaglutide) is approved by Swissmedic for adults with obesity (body mass index of 30 or above) or with severe overweight (BMI of 27 or above) and at least one weight-related condition such as high blood pressure, prediabetes, type 2 diabetes or sleep apnoea. The active substance tirzepatide is also approved in Switzerland – though the conditions and insurance coverage differ (more in Section 9).

The key point: these medications are not meant for losing “a quick few kilos”. They’re for people whose weight is burdening their health – and they’re designed as a longer-term, medically supported treatment, not a few-week course.

Whether you personally are suitable depends on your BMI, your accompanying conditions, your medical history and your previous attempts. That can’t be settled online – only medically. If you’re unsure whether this path is worth it for you, our short eligibility check gives you a sense in a few minutes – no obligation.

How much weight can you realistically lose?

It’s very individual and depends on genetics, response, dose and, above all, the lifestyle changes you make. What the research shows:

• In the STEP-1 study, adults with overweight or obesity on semaglutide 2.4 mg lost, on average, around 15 % of their body weight over 68 weeks – considerably more than the roughly 2–3 % in the placebo group (Wilding et al., NEJM 2021) [2].
• In the SURMOUNT-1 study with tirzepatide, the highest dose produced an average of up to around 21 % over 72 weeks (Jastreboff et al., NEJM 2022) [3].

Two points of context. First, these are study findings, not a guarantee for any individual. Second, and this is easily skimmed over: participants in these studies always also received counselling on nutrition and movement. The medication was never on its own; it was part of a plan.

Benefits beyond weight loss

Interesting for prevention: the benefit appears to go beyond the scale.

• Cardiovascular: in the SELECT study of more than 17,000 adults with obesity but without diabetes, the risk of serious cardiovascular events fell by around 20 % on semaglutide (Lincoff et al., NEJM 2023) [4].
• Kidneys: the FLOW study was stopped early because of clear efficacy – in people with type 2 diabetes and chronic kidney disease, it showed around 24 % less progression of kidney damage and cardiovascular death (NEJM 2024) [5].
• Liver: for the fatty-liver disease MASH, data (the ESSENCE programme) point to an improvement [6]. (Exact figures and publication details to be verified before release.)

That fits a thought we hold dear at care: weight is rarely an isolated topic. It’s linked to the heart, metabolism and blood vessels – and that’s exactly why a weight treatment belongs in a wider health context, not on the scale alone.

What side effects and risks are there?

Like any effective medication, GLP-1 substances have side effects. The most common are gastrointestinal complaints: nausea, vomiting, diarrhoea, constipation. They’re usually mild to moderate and often improve as the body adjusts to the dose – which is exactly why the dose is raised slowly.

Rarer but worth taking seriously are problems with the pancreas (pancreatitis) or the gallbladder, among others. A possible loss of muscle mass during weight loss is also on the list (more in Section 10). Anyone also taking other diabetes medications (e.g. insulin or sulfonylureas) has a higher risk of hypoglycaemia – another reason for medical support.

Benefits and risks need to be weighed against each other – and that’s a medical job, not one to solve alone on a smartphone.

Who is GLP-1 not suitable for?

There are situations in which these medications are not recommended – for example with:

• a personal or family history of certain thyroid cancers (medullary thyroid carcinoma) or MEN-2 syndrome,
• a previous inflammation of the pancreas (pancreatitis),
• a known allergy to the active substance,
• pregnancy or breastfeeding.

On the subject of family planning: anyone wishing to become pregnant should discuss the treatment with their doctor well in advance and pause it as planned.

This list isn’t complete. Which factors count in your case is something the medical assessment clarifies, with your full medical history.

What does it cost in Switzerland – and what’s in the price?

This is where things get specifically Swiss – and it’s the part international guides usually leave out.

First, health insurance. Since 1 March 2024, basic health insurance (compulsory) can cover a GLP-1 treatment for weight regulation – but only under strict conditions (the Federal Office of Public Health’s so-called Limitatio) [8]. As of 2026, the following in particular applies:

• a BMI of 35 or above, or a BMI above 27 up to 35 together with a weight-related condition (e.g. high blood pressure, prediabetes, type 2 diabetes, sleep apnoea),
• a prescription from a specialist in endocrinology/diabetology or a specialised obesity centre,
• a documented change in nutrition and more movement,
• continued coverage only if a certain amount of progress is reached after 4 and 10 months and then maintained.

So whether your insurer pays in your case depends on narrow criteria and isn’t automatic. That’s clarified in the medical assessment.

One important point: the care weight-loss programme is independent of this and a self-pay service – it is currently not covered by basic health insurance. The insurance route described above runs only through specialised endocrinology or obesity centres and is a separate path. So at care you pay for your programme yourself – and in return you get a complete, doctor-led setting.

And what’s in the price at care? At care you don’t simply get a medication – you get a complete, doctor-led programme. The setting around the medication matters just as much for safety and success as the substance itself. That includes:

• A weight-loss check-up at the start  – a snapshot (blood test, muscle–fat analysis, blood pressure) that shows where your health stands. This baseline is the foundation for a safe, medically sound treatment.
• A detailed questionnaire about your full medical history and your lifestyle.
• A monthly muscle–fat analysis – you see not just the number on the scale but your body composition: how much fat you’re losing and – at least as important – how much muscle mass you’re keeping. This is a central sticking point when losing weight with GLP-1 (see Section 10): losing weight is not the same as losing weight well. You follow it in black and white in the App.
• A monthly video consultation with your doctor: nutrition and lifestyle tips, managing side effects and, if needed, adjusting the dose.
• Simple, digital access and ongoing support through the App, where you track your progress.

For the medication itself, you have free choice of pharmacy – that matters to us, and we make it possible. If you’d like it conveniently delivered chilled to your home, you may pay somewhat more depending on the pharmacy, but you save yourself the trip. The exact cost depends on the treatment and the pharmacy you choose.

The value lies in the overall package: simple, digitally guided access, continuous one-to-one medical support, and measurements that make your body composition visible – not just your weight. That way the treatment is designed from the start to be safe and to put healthy, lasting results at the centre.

Unsure whether this fits you – and what your insurer contributes? You can’t work that out in your head. In the care* eligibility check we map exactly that – no obligation, medically reviewed.*

How do you keep your muscle?

Part of the weight you lose can be muscle mass – and you want to keep your muscle, for strength, metabolism and health. Two levers are well established:

• Enough protein: studies show that a protein intake of around 1.1–1.6 g per kilogram of body weight better preserves fat-free mass during weight loss. In practice: 20–40 g of protein per meal.
• Strength training: a protein-rich diet alone isn’t enough – muscle is preserved only when it’s combined with regular strength training.

That’s also why a good treatment is never “just the injection”, but factors in nutrition and movement.

What happens if you stop?

If the medication is stopped, appetite and “food noise” often return, and some of the weight can come back on. That’s not a weakness, it’s biology – obesity is a chronic disease.

That’s why GLP-1 is usually thought of as a longer-term treatment, and the transition (if you do stop) belongs under medical supervision, together with nutrition, movement and regular check-ups. This continuous support makes the difference between a short-lived effect and a stable result.

How does a GLP-1 treatment at care work?

At care, nothing starts with a medication – it starts with a question: does this even make sense for you? The process is deliberately paced by doctors:

1. A health questionnaire online (about 5–10 min) with an eligibility check. If you’re not eligible, you can also book a check-up first and try without medication.
2. A blood and body analysis at a partner location (about 20 min).
3. A medical video consultation (45 min) with your care doctor.
4. An individual plan – treatment plus support on nutrition and movement.
5. A monthly rhythm: progress checks, a video follow-up, medical adjustments, App support – so a start becomes a lasting result.

Are you suitable? Find out in a few minutes. Take the no-obligation eligibility check – it helps you judge whether the next step is worth it for you, and if you’re suitable, takes you straight to the medical eligibility check. No pressure, no upfront cost, reviewed by the FMH team. → Check your eligibility

In brief

GLP-1 medications are an effective medical tool for obesity – with real benefits, real risks and clear Swiss rules of the game. They replace neither nutrition and movement nor medical support, and they aren’t cheating. It comes back to what we said at the start: weight is, to a large degree, biology – and biology can be supported. The sensible first step isn’t to “buy”, but to find out whether this path fits you.

Frequently asked questions

Are GLP-1 medications available without a prescription? No. In Switzerland they are prescription-only and are dispensed only after a medical assessment and prescription.

Is GLP-1 a “weight-loss miracle”? No. It’s an effective aid that dampens hunger and “food noise”. The difference is made by nutrition, movement and medical support – the medication makes the path easier, not unnecessary.

Does health insurance pay for the weight-loss injection? Through basic health insurance only under very strict conditions and via specialised endocrinology/obesity centres (among other things, from a BMI of 35 or from a BMI of 27 with an accompanying condition, and a documented lifestyle change). The care weight-loss programme is independent of this and a self-pay service – it is currently not covered by basic health insurance.

What does the care programme cost? For the medication you have free choice of pharmacy; a convenient chilled delivery to your home may cost somewhat more depending on the pharmacy. On top comes the doctor-led overall programme: simple digital access, the App, monthly video consultations and muscle–fat measurements that show your body composition – not just your weight. The exact cost depends on the treatment and the pharmacy. The care programme is a self-pay service and is currently not covered by basic health insurance.

Which side effects are common? Mainly gastrointestinal complaints such as nausea, which often improve over time. Rarer, more serious risks are discussed with you by your treating doctor.

Will I regain weight after stopping? That can happen, because appetite and metabolism return. That’s why a longer-term, supported strategy matters.

Medical disclaimer

This article is for general information and health education. It does not replace individual medical advice, diagnosis or treatment. Whether a particular treatment is suitable for you is decided in a medical assessment. Prescription medications mentioned are available only on a doctor’s prescription. If you have health concerns, consult a doctor.