Endocrine
Medicines for Obesity
Carrying excess body fat that raises the risk of conditions such as type 2 diabetes, high blood pressure and heart disease — managed through sustained changes to diet and activity, with medicines or surgery as options for some.
Education and reference only. This explains which medicines are used and why, in plain language — it deliberately contains no doses and is not a substitute for advice from your doctor or pharmacist. Always discuss your own treatment with a qualified clinician, and check the BNF and the product labelling for prescribing detail.
Quick answer
What is Obesity?
Obesity means carrying more body fat than is healthy, to a degree that raises the risk of long-term health problems. It is assessed using measures such as body mass index (BMI), which relates weight to height, alongside waist size, which gives a sense of fat carried around the middle.
- How it is treated: The cornerstone of managing obesity is sustained change to diet, physical activity and everyday habits, ideally with structured behavioural support that helps make those changes realistic and lasting.
- Self-care: A balanced, sustainable eating pattern, being more physically active in ways you can keep up, improving sleep and managing stress all support weight management and overall health.
- When to seek help: Speak to your GP or practice nurse if you would like support to manage your weight, particularly if you also have conditions such as type 2 diabetes, high blood pressure or joint problems, as help and structured programmes are available.
What it is
Obesity means carrying more body fat than is healthy, to a degree that raises the risk of long-term health problems. It is assessed using measures such as body mass index (BMI), which relates weight to height, alongside waist size, which gives a sense of fat carried around the middle. Excess weight is linked to a wide range of conditions, including type 2 diabetes, high blood pressure, high cholesterol, heart disease, joint problems, sleep difficulties, certain cancers and the hormone condition polycystic ovary syndrome. It can also affect mood, energy and day-to-day comfort. Obesity is not simply a matter of willpower — it develops from a mix of diet, activity levels, genetics, sleep, stress, some medicines and the wider environment we live in. Understanding it as a long-term health condition, rather than a personal failing, helps frame the supportive, sustained approach that works best.
How it is treated
The cornerstone of managing obesity is sustained change to diet, physical activity and everyday habits, ideally with structured behavioural support that helps make those changes realistic and lasting. The aim is steady, achievable progress that improves health and lowers risk, rather than rapid loss that is hard to maintain. For some people who meet certain criteria, medicines can be offered alongside — not instead of — these lifestyle changes. Modern options include the GLP-1 receptor agonists, which act on appetite signals to support weight loss when used together with diet and activity support. For people with more severe obesity, or where other approaches have not worked and health is at risk, weight-loss (bariatric) surgery may be considered. Whichever route is taken, the emphasis is on long-term, supported change, with regular review and care for the linked conditions such as diabetes and blood pressure.
For this condition, these medicines
Medicine classes used for Obesity
Each links to a full, dose-free guide — what it is, how it works, who can and cannot use it, side effects, interactions and FAQs.
Symptom checker
Symptoms that can point to Obesity
Obesity can be one cause of these symptoms. Each guide explains the other possible causes and the red-flag warning signs that mean you should get urgent help:
Clinical formulas & tools
Calculators used in Obesity
Risk scores and formulas that inform assessment and treatment decisions in this condition:
Beyond medication
Lifestyle and self-care
A balanced, sustainable eating pattern, being more physically active in ways you can keep up, improving sleep and managing stress all support weight management and overall health. Small, lasting changes tend to work better than strict short-term diets, and support from a healthcare professional or a structured programme can make a real difference. Even a modest reduction in weight can improve blood pressure, blood sugar and how you feel day to day.
When to get help
When to see a doctor
Speak to your GP or practice nurse if you would like support to manage your weight, particularly if you also have conditions such as type 2 diabetes, high blood pressure or joint problems, as help and structured programmes are available. It is worth seeking advice if weight is affecting your breathing, sleep, mobility or mood, or if you have gained weight quickly without an obvious reason. Sudden severe breathlessness, chest pain, or breathing that stops during sleep with daytime exhaustion should be assessed promptly. Before starting any weight-loss medicine, a GP or specialist will check it is suitable for you, and any rapid or extreme weight change always deserves a medical review.
Not sure how urgent it is? It is always OK to call NHS 111 for advice, day or night.
Answers
Obesity: frequently asked questions
What medicines are used for obesity?
Medicines are offered to some people who meet certain criteria, and always alongside changes to diet, activity and everyday habits rather than instead of them. The main modern options are the GLP-1 receptor agonists, such as semaglutide or liraglutide, which act on the brain's appetite signals to reduce hunger and support weight loss when combined with lifestyle support. They are prescribed and monitored by a healthcare professional, who checks they are suitable for you. They are not a quick fix or a substitute for sustained change, but a tool that can help certain people make and keep that change. For more severe obesity, weight-loss surgery may also be considered.
How is obesity assessed?
Healthcare professionals use a few simple measures together. Body mass index, or BMI, relates your weight to your height and gives a general category, while waist size shows how much fat is carried around the middle, which is particularly linked to health risk. These are considered alongside your overall health, any linked conditions such as diabetes or high blood pressure, your ethnicity and your individual circumstances. No single number tells the whole story, so the picture is taken as a whole. A BMI calculator can give you a starting figure, but a conversation with your GP or nurse is the best way to understand what it means for you and what support might help.
Will medication replace diet and exercise?
No. Weight-loss medicines are designed to work alongside changes to diet, activity and habits, not to replace them. They can make those changes easier — for example by reducing appetite — but the lasting benefit comes from the supported, sustainable changes you build over time. This is why medicines are offered with behavioural support and regular review, and why they suit some people rather than everyone. Thinking of medication as one tool within a broader, long-term plan, rather than a standalone solution, gives the best chance of improving health and keeping the benefit going.
Can losing some weight really improve my health?
Yes, and you do not have to reach an ideal weight to benefit. Even a modest, steady reduction in weight can lower blood pressure, improve blood sugar control, ease pressure on the joints and improve sleep, breathing, energy and mood. It can also reduce the risk of developing conditions such as type 2 diabetes and heart disease. Because of this, the focus is on realistic, achievable goals rather than dramatic targets, with the changes maintained over the long term. Small improvements add up, and your GP, nurse or a structured programme can help you set goals that are right for you.
Keep reading
Related articles
Sources
Where this is drawn from
- NICE CKS: Obesity.
- NICE CKS: Obesity.
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