Last checked: 18 August 2026
Scope: UK general information
Clinical review: Qualified review completed
Important: This page provides general education, not medical advice. A prescriber, pharmacist, or other appropriate healthcare professional should assess individual circumstances, medicines, and treatment decisions.
The short answer
GLP-1 medicines are prescription-only medicines used for specific licensed purposes, including type 2 diabetes and, for some products, weight management. Brand names, licensed indications, access routes, risks, and suitability differ. A medicine that contains the same active ingredient as another product is not automatically licensed for the same purpose. The safest next step for a reader considering a GLP-1 medicine is a conversation with an appropriately regulated healthcare professional, not a product comparison or a social-media seller.[1]
What are GLP-1 medicines?
GLP-1 receptor agonists are medicines that act on a hormone involved in appetite and blood-sugar regulation. Some medicines that people describe as “weight-loss injections” are GLP-1 medicines; some newer medicines also affect another hormone pathway. Those descriptions are not a substitute for checking the exact product, active ingredient, and licensed use.[1]
In the UK, semaglutide is sold under several brand names. The MHRA identifies Wegovy as a semaglutide product licensed for weight management, while Ozempic and Rybelsus are licensed for diabetes rather than weight management. The medicines regulator has not assessed safety and effectiveness when these medicines are used outside their licensed indications.[1]
Key distinction: A medicine’s active ingredient, brand, licensed indication, and access route are separate facts. Do not assume that a product is appropriate for a purpose simply because its active ingredient is discussed online in that context.
Prescription, supply, and access
All GLP-1 medicines are prescription-only. They must be prescribed by a healthcare professional, including when supplied privately. The MHRA advises against obtaining these medicines from unregulated sellers, social-media sellers, beauty salons, or any source that supplies medicine without an appropriate consultation. It warns that counterfeit and unauthorised products can pose serious risks.[1]
For people seeking NHS assessment for weight management, NHS England explains that access is determined through specialist services and can vary by local integrated care board. Eligibility is not something an online article can determine. A clinician can explain the relevant local pathway, alternatives, and whether assessment is appropriate.[2]
If a reader is considering a private prescription, the MHRA recommends checking that the pharmacy is properly registered and ensuring that the prescription follows a healthcare-professional consultation. The regulator provides links to the relevant pharmacy registers and to information on obtaining medicines safely online.[1]
Benefits, limits, and why individual assessment matters
Semaglutide is used in licensed settings to manage type 2 diabetes or treat obesity. The NHS explains that, in the obesity setting, it is used alongside diet and physical-activity changes; it is not presented as a stand-alone replacement for broader care.[3]
A general-information page cannot tell a person whether a medicine is suitable, predict their response, or compare outcomes for an individual. Relevant considerations can include the condition being treated, other medicines, pregnancy plans, a person’s health history, and the product’s licensed indication. These questions belong in a consultation with a prescriber or pharmacist.[1] [3]
Safety information and when to seek help
Like all medicines, GLP-1 medicines can have side effects. The MHRA identifies gastrointestinal effects such as nausea, vomiting, and diarrhoea as common; in some cases, they can lead to dehydration and require medical attention. Product information and patient leaflets remain the appropriate place to check the complete list for a specific medicine.[1]
The MHRA also advises urgent medical help for severe stomach pain that radiates to the back and does not go away, because this can be a sign of acute pancreatitis. The NHS lists severe allergic-reaction symptoms and sudden vision changes among serious concerns requiring urgent help. A reader who thinks they are experiencing a serious side effect should use the relevant urgent-care route rather than rely on this page.[1] [3]
Do not make treatment changes based on a general guide
Do not change, stop, restart, or switch a prescribed GLP-1 medicine without discussing it with the healthcare professional responsible for the treatment. The MHRA states that switching products without medical advice can increase the risk of side effects or reduce effectiveness.[1]
Pregnancy, breastfeeding, surgery, and other medicines
The MHRA advises that GLP-1 medicines should not be taken during pregnancy, while trying to become pregnant, or during breastfeeding. It also sets out medicine-specific timing information and advises people to discuss contraception and pregnancy plans with a healthcare professional.[1]
People preparing for an operation or procedure should tell their healthcare team, including the anaesthetist, that they take a GLP-1 medicine. The MHRA explains that these medicines can affect stomach emptying, which may require changes to pre-procedure instructions or technique.[1]
The NHS also advises readers to tell a doctor or pharmacist about other medicines, herbal remedies, vitamins, or supplements. This is especially important because individual combinations and clinical circumstances can differ.[3]
Questions that can help a healthcare appointment
A reader may find it useful to prepare questions such as:
- What condition is this medicine being considered for, and what is its licensed use in my situation?
- What benefits, limitations, and common side effects should I understand before deciding?
- How do my current medicines, health history, pregnancy plans, or planned procedures affect this discussion?
- What follow-up, support, and safety information should I use?
- Where can I find the official patient information leaflet for the exact medicine prescribed?
These questions support an informed conversation; they are not a checklist for self-assessment or self-prescribing.
If you are worried about a medicine or suspect a fake product
If you think you are experiencing a serious side effect, use NHS 111, urgent care, or emergency services as appropriate. Suspected side effects can also be reported through the MHRA Yellow Card scheme. If a medicine was bought from an unregulated source or appears suspicious, do not use it; seek advice from a pharmacist, prescriber, or an appropriate official route.[1] [3]
Editorial note
SemaglutideGuide publishes general information. It does not sell GLP-1 medicines, endorse specific prescribers, or determine whether treatment is appropriate for an individual. Material factual claims on this page were checked against the official sources below on 18 August 2026.
Sources
[1] MHRA: GLP-1 medicines for weight loss and diabetes — what you need to know, updated 5 February 2026.
[2] NHS England: Weight management injections.
[3] NHS: Semaglutide, reviewed 15 May 2026.