Wegovy is a prescription weight-loss injection that contains semaglutide. It is used for weight loss and weight maintenance alongside a reduced-calorie meal plan and increased physical activity. If you’re researching Wegovy, the most important things to understand first are: what it is, who it’s intended for, how it’s taken, and how to access it safely in the UK.

If you want the full product overview and the next-step guides, start here: Wegovy (semaglutide) weight loss injection.

Table of Contents

Quick definition

Wegovy is a once-weekly injection used to help people with obesity, or people who are overweight with weight-related health problems, to lose weight and keep it off. The active ingredient is semaglutide, a medicine that acts on appetite regulation pathways.

What Wegovy is used for

Wegovy is used for weight loss and weight maintenance in addition to diet and physical activity.

Adults (18+):

Body mass index (BMI) of 30 kg/m² or higher (obesity), or
BMI of 27 to under 30 kg/m² (overweight) with weight-related health problems.

Adolescents (12+):

Wegovy may be used for weight management in adolescents aged 12 years and above who have obesity and weigh more than 60 kg. Eligibility and monitoring should be clinician-led.

BMI threshold mini-table

Group	BMI	Typical requirement
Adults	≥ 30	Obesity
Adults	27 to < 30	Overweight + weight-related health problems
Adolescents (12+)	Obesity (age/sex-specific charts)	Weight > 60 kg; specialist monitoring

How Wegovy works (high-level)

Semaglutide (the active ingredient in Wegovy) acts on receptors in the brain involved in appetite regulation. In practical terms, many people experience reduced hunger, feeling full sooner, and fewer food cravings. Because appetite and digestion signals change, some people also experience gastrointestinal side effects, especially during dose increases.

How Wegovy is taken

Wegovy is taken once a week as a subcutaneous (under the skin) injection. It is not an intravenous injection and it is not taken daily.

Does everyone start on the same dose?

Most people start Wegovy on a low dose and increase gradually. This gradual increase is designed to improve tolerability, especially for nausea and other digestive side effects. The exact schedule and any adjustments should be clinician-led.

UK update: higher 7.2 mg weekly dose

In the UK, the regulator has approved a higher maximum weekly dose (up to 7.2 mg) for certain patients with obesity. This higher dose is administered as three separate injections on the same day. It is not appropriate for everyone and should be considered only under clinician supervision.

Who Wegovy may be suitable for (and who it isn’t)

Wegovy is intended for people who meet BMI eligibility criteria and who will use it as part of a broader weight management plan that includes diet and physical activity. It is not a cosmetic quick fix, and it is not suitable for everyone.

Eligibility checklist (quick scan)

You may be considered for Wegovy if:

You meet the BMI criteria (obesity, or overweight with weight-related health problems).
You are willing to combine it with a reduced-calorie meal plan and increased physical activity.
You can commit to follow-up reviews and safe monitoring.

Wegovy may NOT be suitable if:

You have contraindications or specific medical risks that require an alternative approach.
You are pregnant, trying to conceive, or breastfeeding (clinician guidance required).
You plan to use it without diet/activity changes or without medical supervision.

Common side effects and safety red flags (brief overview)

The most commonly reported side effects are digestive, such as nausea, diarrhoea, constipation, and vomiting especially during dose increases. Many people find that smaller meals, slower eating, and hydration reduce symptoms, but persistent or severe symptoms need medical review.

Seek urgent medical help if you have severe abdominal pain, signs of dehydration, fainting, or any symptoms that feel sudden or severe. Do not wait for your next scheduled dose if you feel seriously unwell.

How to access Wegovy safely in the UK

In the UK, semaglutide (Wegovy) can be accessed through specialist weight management pathways on the NHS for eligible patients, and through regulated private services with appropriate clinical screening.

NHS pathway (high-level)

NHS access is typically through a specialist weight management service. NICE recommendations set eligibility thresholds and the NHS pathway includes reviews to confirm benefit and safety.

Private pathway (MedCare)

A private consultation include eligibility checks, medical history review, current medicines review, and follow-up monitoring. Avoid unregulated sellers and social-media offers Wegovy is prescription-only.

Wegovy vs Ozempic (quick clarification)

Wegovy and Ozempic contain the same active ingredient (semaglutide), but they are authorised for different purposes and have different dose structures and product positioning. Your prescriber should confirm which product is appropriate for your goals and health profile.

Frequently asked questions

Is Wegovy a diabetes medicine?

Wegovy contains semaglutide, a medicine also used in other products for diabetes. Wegovy itself is authorised for weight management. Your clinician will decide what is appropriate for your health needs.

Do I have to change my diet and exercise?

Yes. Wegovy is intended to be used alongside a reduced-calorie meal plan and increased physical activity. Without lifestyle changes, results and tolerability are usually worse.

How long do people stay on Wegovy?

Length of treatment depends on response, tolerability, and the pathway you access it through. Regular reviews are part of safe treatment.

What if I feel very sick after a dose increase?

Do not ignore severe symptoms. Review your symptoms with a clinician—especially if you have repeated vomiting, dehydration, severe abdominal pain, or feel faint.