Medically reviewed by W. van Donselaar, doctor, BIG 79020681301, on 27 August 2026.
More and more people are considering medical treatment to get their weight under control. At the same time, you hear lots of different stories in the news and on social media about medicines such as Ozempic and Wegovy. This raises questions: is it actually safe? Who monitors whether you’re doing OK? And what side effects do you actually notice?
In this blog, we answer these questions based on medical knowledge, so that you can make an informed choice.
The short answer
Medically supervised weight loss using GLP-1 medication is safe for most suitable candidates, provided the programme is supervised by a doctor. GLP-1 medicines such as semaglutide (Ozempic, Wegovy) have been extensively researched and have been used for many years in the treatment of type 2 diabetes and obesity. Safety depends entirely on a thorough medical assessment beforehand, monitoring during treatment and attention to side effects. Not everyone is suitable for this medication: a doctor will always assess this on a case-by-case basis.
Table of Contents
- How safe are GLP-1 medicines such as Ozempic and Wegovy?
- Who monitors the treatment?
- What are the most common side effects?
- Practical tips for a safe journey
- Frequently asked questions
- Key insights
- Conclusion
Would you like to know whether a medical treatment programme is right for you? Find out whether a medical treatment programme is right for you and start with a no-obligation BMI check.
How safe are GLP-1 medicines such as Ozempic and Wegovy?
GLP-1 medicines such as semaglutide (the active ingredient in Ozempic and Wegovy) are neither new nor untested. Semaglutide has been used to treat type 2 diabetes since 2018 and has been studied in large-scale clinical trials ever since. Since 2021, semaglutide in a higher dose (Wegovy) has also been approved for the treatment of overweight and obesity in people who meet certain medical criteria. This approval by regulatory bodies such as the European Medicines Agency (EMA) is based on research into both efficacy and safety. We explain exactly how the medicine affects your feelings of hunger and satiety in how GLP-1 works in the body.
The fact that the medicine has been approved and tested does not mean that it is suitable for everyone or free from risks. Safety is not a given, but the result of a careful process: a correct diagnosis, an appropriate dose and proper follow-up. At WeightConsult, a doctor therefore always assesses first whether GLP-1 medication is suitable for your health situation before starting treatment.
What does a doctor look out for before starting treatment?
Certain medical conditions require extra caution or mean that GLP-1 medication is unsuitable, such as:
- Pregnancy or breastfeeding
- A history of pancreatitis (inflammation of the pancreas)
- A family history of certain thyroid conditions, such as medullary thyroid carcinoma
- Serious gastrointestinal disorders
- Use of other medicines that may interact
This is not an exhaustive list, but an indication of the types of factors that are taken into account. You can read about the full criteria and exactly how the assessment is carried out in Am I eligible for a WeightConsult programme?.
Who monitors the treatment?
With a medically supervised programme, you are never solely responsible for the safety of your treatment. You can read about exactly how medically supervised weight loss differs from dieting or self-directed coaching in What is medically supervised weight loss?. Here, we focus specifically on monitoring during the treatment itself.
During treatment Follow-up remains important. This is because symptoms or side effects can vary from person to person, and the dosage is often increased gradually to give the body time to adjust. At WeightConsult, you can stay in touch with customer services and the treating doctors via a secure channel. Following the first few weeks of treatment, there is a standard review appointment to discuss progress and any symptoms.
This kind of medical involvement is precisely what distinguishes purchasing medication yourself without supervision from a programme in which a doctor provides ongoing monitoring. That supervision is one of the main reasons why medically supervised weight loss is considered safer than the unmonitored use of weight-loss medication.
What are the most common side effects?
As with almost any medication, side effects may occur. With GLP-1 medication, these are mainly related to the gastrointestinal system, as the drug affects digestion and the feeling of fullness.
The most commonly reported side effects are:
- Nausea, particularly during the first few weeks or when the dose is increased
- Diarrhoea or, conversely, constipation
- Bloating or stomach ache
- Reduced appetite
- Fatigue
These side effects are usually mild to moderate in nature and often subside as the body gets used to the medication. For this reason, the dose is usually increased gradually: this reduces the likelihood of side effects and gives your body time to adjust.
More serious side effects, such as inflammation of the pancreas, are less common. That is precisely why it is important to always report any symptoms to your doctor, so that treatment can be adjusted in good time. This is one of the reasons why support throughout the entire process is just as important as the initial assessment.
Differences between people
How your body responds to GLP-1 medication varies from person to person. Factors such as age, general health, other medication and the way the dose is increased all play a part in this. This is precisely why standardised advice is not sufficient and a personalised treatment plan is essential.
Practical tips for a safe journey
- Please be completely honest when completing your medical questionnaire. This enables the doctor to make an accurate assessment of what is safe for you.
- Always report any side effects, even if they seem mild. Early warning signs enable your doctor to adjust your treatment plan in good time.
- Build up the dosage gradually, as described in your treatment plan. This reduces the likelihood of symptoms.
- Combine medication with a suitable diet, so that your programme contributes to lasting change rather than a temporary effect.
Frequently asked questions
Is medically supervised weight loss safer than ordering over-the-counter medication? Yes. In a medically supervised programme, a doctor assesses in advance whether the medication is suitable and safe for your situation, and supervision continues throughout the treatment. When medication is purchased without supervision, this medical assessment is completely absent.
Can anyone who is overweight take GLP-1 medication? No. Suitability depends on your medical history and any contraindications. Read more about the eligibility criteria in Am I eligible for a WeightConsult programme?
How soon do you notice side effects? Side effects such as nausea usually occur during the first few weeks of treatment or following a dose increase. In many people, they gradually subside as the body gets used to the treatment.
What happens if you experience side effects? You should report this to your treating doctor, for example via a secure communication channel. Based on this, the dosage or treatment plan may be adjusted.
Will I need to take the medication for the rest of my life? This varies from person to person and depending on the situation. A doctor will discuss with you what the appropriate duration and approach are, also with a view to maintaining the results after treatment.
What if a safety risk does arise during treatment? Any side effects you report to your treating doctor may lead to a change in dosage or, if necessary, the discontinuation of treatment. Safety always takes precedence over sticking to a fixed schedule.
Key insights
- GLP-1 medication such as semaglutide has been extensively researched and has been in clinical use for years, but it is not suitable for everyone.
- Safety depends on a thorough medical assessment beforehand and follow-up during treatment.
- The most common side effects are mild and mainly affect the gastrointestinal system, such as nausea and bloating.
- Gradually increasing the dose reduces the likelihood of side effects.
- In a medically supervised programme, a doctor assesses each application on a case-by-case basis and supervision is maintained throughout the entire process.
Conclusion
Medically supervised weight loss can be a safe option for people who want to manage their weight and improve their health, provided it is carried out under a doctor’s supervision. Safety lies not only in the medication itself, but above all in the process surrounding it: a thorough initial assessment, a suitable treatment plan and regular monitoring throughout the treatment. This ensures that the programme is tailored to your situation, and that adjustments can be made in good time if necessary.
Would you like to know whether a medical treatment programme is right for you? Find out whether a medical treatment programme is right for you and start with a no-obligation BMI check.
Key points blog
Is medically supervised weight loss using GLP-1 medication safe?
Is medically supervised weight loss using GLP-1 medication safe?
For suitable candidates, yes, provided that a doctor assesses in advance whether the medication is appropriate and that the treatment is monitored throughout the programme.
What are the most common side effects of GLP-1 medication?
What are the most common side effects of GLP-1 medication?
In particular, mild gastrointestinal symptoms, such as nausea, bloating and changes in bowel habits, which often subside over time.
Who checks that a treatment is being carried out safely?
Who checks that a treatment is being carried out safely?
A doctor assesses each application in advance and remains involved throughout the treatment, including through regular reviews and a secure communication channel.