What Is Wegovy® Injection?

Semaglutide belongs to the GLP-1 receptor agonist class of medicines, which mimic the body’s natural GLP-1 hormone involved in appetite regulation.For UK adults exploring clinically supervised prescription options for obesity or for overweight with related health conditions, it is a once-weekly injectable treatment prescribed following clinical assessment and used alongside ongoing monitoring where appropriate

GLP-1 is a natural hormone involved in appetite control, and it also helps regulate blood sugar levels after eating. Semaglutide works by mimicking this hormone to reduce hunger, increase feelings of fullness, and promote insulin release when blood sugar levels are high, which may help reduce appetite and increase feelings of fullness when used as prescribed alongside a reduced-calorie diet and increased physical activity.

This page explains what Wegovy injection is, how it works, the clinical benefits seen in trials, who may be eligible, possible side effects, dosing and safety guidance, and why regular lifestyle support and check-ins matter during treatment. Weight management is influenced by multiple factors, including diet, physical activity and overall health, so understanding whether a medically supervised option such as Wegovy is suitable can help you make a safer, more informed decision.

Before prescribing Wegovy, semaglutide can only be supplied by a qualified health care provider after evaluating a patient’s medical history, BMI, obstructive health, current prescriptions and overall health.

Wegovy is a prescription-only semaglutide.

Why Is Wegovy Prescribed?

There are many contributors to weight management, such as the ability to regulate appetite, the nature of eating habits and physical activity, genetics, and other health conditions, all of which can affect progress toward a healthy weight.

For some eligible adults, Wegovy may assist with other components of a weight management program and work alongside a diet and exercise plan.

When prescribed in a suitable manner, this treatment may assist some patients to:

• Feel fuller after meals.
  
• Help reduce feelings of hunger.
  
• Support portion control.
  
• Help some people follow a reduced-calorie eating plan.
  
• Support healthy lifestyle changes alongside treatment.

The response to the treatment varies for each person.

The healthcare provider will evaluate your progress and determine the continued appropriateness of the treatment.

How does Wegovy injection work?

How does Wegovy work? Wegovy has semaglutide, a drug that mimics the GLP-1 (glucagon-like peptide-1) hormone that occurs naturally in the body. After a meal, GLP-1 is released and helps regulate appetite, food intake, and blood sugar.

Semaglutide can activate GLP-1 receptors that can:

• Aid in the Increase of Fullness
  
• Reduce appetite
  
• Slow gastric emptying (the food leaves your stomach slowly)
  
• Help in maintaining a reduced calorie diet

By helping some people feel satisfied with smaller meals, Wegovy may support healthier eating habits alongside lifestyle changes.

However, as individuals differ, treatment effects will also differ. Some individuals will feel the change in appetite faster than others, while some will find the need for a different dose during treatment.

Wegovy is also approved to reduce the risk of major adverse cardiovascular events in eligible adults with obesity and established cardiovascular disease. This indication is supported by large cardiovascular outcomes research. Wegovy injection should always be used alongside a healthy diet and regular exercise and as prescribed, It should be used alongside a healthy diet and regular physical activity as prescribed

Compare Your Weight Management Injection Options

Several prescription medicines are available to support weight management in eligible adults. The most appropriate option depends on your individual health needs, medical history and clinical assessment.

Wegovy contains semaglutide, while Mounjaro contains tirzepatide. Wegovy Pill is the first GLP-1 tablet available in the UK.

Clinical trial results were observed in separate clinical studies under controlled conditions. These results should not be compared directly, as study designs and participant populations differed. Individual outcomes vary.

Complete an online consultation to find out which prescription weight management treatment, if any, may be suitable for you.

Reasons for Selecting a Weekly Weight Management Injection

A weekly injection may be more convenient for some people than a daily medication.

Wegovy is designed for once-weekly administration and may be suitable for eligible adults who prefer a weekly treatment schedule

Wegovy is a prescription weight management medication and should only be used under the supervision of a qualified healthcare professional. This allows for regular check-ins to make sure the treatment is still needed, that side effects are reported, and that the dose can be adjusted.

A clinical assessment and consideration of your lifestyle and medical history will inform if a weekly injection will be used for your treatment.

Changing between weight management injections If you’re currently prescribed a weight management injection, don’t switch between them without talking to your healthcare professional. Even though there are medicines such as Wegovy and other weight loss treatments available to help manage weight, they have different dosing and aren’t directly interchangeable; while Ozempic and Wegovy contain the same active ingredient, semaglutide, Wegovy and Mounjaro do not.

Your healthcare provider will take into account all of the following before advising you if it’s okay to switch treatments:

• Your present or prior weight management medication
  
• The dosage that you’re on
  
• The duration that you’ve taken it
  
• Any side effects that you have suffered
  
• Your advancement in treatment
  
• Your medical history and any other medications that you’re taking
  
• Your physical and mental well-being If your healthcare professional agrees that it is the right time to switch, they will instruct you on the best method to begin using Wegovy.

Do not ever quit taking one prescribed medication and go directly to another, unless guided by your physician or another certified health professional.

How to Use Weight Management Injections Safely

Follow your healthcare provider’s directions carefully for prescription weight loss injections.

You can inject the drug once per week using the Wegovy injection pen. Each Wegovy pen contains 4 doses for 4 weeks, and you’ll start at the lowest possible dose and gradually increase it to the full dose over time to lower the chance of gastrointestinal issues.

Using Wegovy®

To help you use your treatment safely:

• Inject Wegovy once a week on the same day each week where possible.
  
• Choose a time that fits comfortably into your routine.
  
• Wegovy can be taken with or without food.
  
• Follow the instructions provided with your injection pen.
  
• Only use the prescribed dose of Wegovy from your healthcare professional.

Your treatment is increased gradually and should never go above the maximum dose prescribed.

Gradually increasing the dose allows your body time to adjust and may help improve treatment tolerability.

Where to Inject Wegovy

Wegovy is injected just under the skin (subcutaneously) at the recommended injection site.

Recommended injection sites include:

• The abdomen (stomach area)
  
• The front of the thigh
  
• Upper arms (if someone else is giving the injection)

It’s good practice to rotate each injection site each week to help reduce soreness or irritation.

If You Miss a Dose

If you forget your weekly injection, what you should do depends on when your next dose is due.

• If your next dose is more than five days away, take the missed dose as soon as possible.
  
• If more than five days have passed, skip the missed dose and take your next injection on your usual scheduled day.
  
• Never take two doses together or an extra dose to make up for a missed injection.

If you’ve missed more than one dose or are unsure what to do, contact your healthcare professional or pharmacist before restarting treatment. Follow missed-dose guidance to stay on schedule with your once-weekly treatment.

Storage

To help maintain the quality of your medicine and store Wegovy correctly:

• Store unused Wegovy pens in a refrigerator between 2°C and 8°C.
  
• Wegovy can be kept unrefrigerated for up to 6 weeks if stored according to the manufacturer’s instructions.
  
• Do not freeze the medicine.
  
• Keep the pen in its original carton to protect it from light.
  
• Once in use, follow the storage instructions supplied with your pen and the Patient Information Leaflet.

Always check the expiry date before using your pen.

Safe Disposal

After each injection:

• Remove and safely dispose of the used needle in an approved sharps container.
  
• Never throw loose needles into household waste.
  
• Never share your injection pen with another person, even if a new needle is fitted.
  
• Store the pen without a needle attached between doses where instructed.

Why Lifestyle Changes Are an Important Part of Weight Management Treatment

Prescription weight management injections work to accompany a healthy lifestyle-not substitute it. In addition to your prescribed weight management injection (such as Wegovy), a diet and exercise plan is also an important component of your treatment. Wegovy works by reducing appetite and increasing feelings of fullness. It should be used alongside a reduced-calorie diet and increased physical activity. Wegovy is indicated for use with a reduced calorie intake and increased physical activity, and the development of sustainable healthy habits can contribute to both during and after treatment.

Follow a Balanced Eating Plan

Aim to include a variety of nutritious foods, such as:

• Lean proteins
  
• Fruit and vegetables
  
• Wholegrains
  
• Healthy fats in moderation

Eating regular meals and paying attention to portion sizes may also help support your overall goals.

Keep Moving

Regular physical activity supports overall health and wellbeing.

This could include:

• Walking
  
• Cycling
  
• Swimming
  
• Resistance or strength training
  
• Low-impact exercise

The best activity is one you enjoy and can continue over time.

Stay Hydrated

Digestive side effects such as nausea, vomiting or diarrhoea may increase the risk of dehydration.

Drink fluids regularly, particularly if you experience nausea, vomiting or diarrhoea

Prioritise Sleep

Getting enough sleep is an important part of overall health and wellbeing.

Attend Follow-Up Reviews

Regular clinical reviews allow your healthcare professional to:

• Monitor your progress
  
• Review any side effects
  
• Adjust your dose if appropriate
  
• Ensure Wegovy continues to be suitable for you

Everyone’s journey is different, and progress can vary from person to person.

Why a Clinical Assessment Is Required Before Weight Management Injections

Wegovy® is a Prescription Only Medicine (POM) and cannot be supplied without a prescription.

Before treatment can begin, a qualified healthcare professional must determine whether it is clinically appropriate for you.

An online consultation allows your prescriber to assess important information, including:

• Your height and weight
  
• Your Body Mass Index (BMI)
  
• Your medical history
  
• Current prescription and non-prescription medicines
  
• Allergies
  
• Previous weight management treatments
  
• Existing medical conditions
  
• Pregnancy or breastfeeding status, where relevant

Providing accurate information helps your healthcare professional make a safe and informed prescribing decision.

Why Is This Assessment Important?

Prescription weight management injections are not suitable for everyone.

Some people may have medical conditions or be taking medicines that affect whether Wegovy is appropriate.

A clinical assessment helps ensure that:

• Wegovy is suitable for your individual health needs.
  
• The potential benefits and risks have been carefully considered.
  
• You receive the appropriate starting dose if treatment is prescribed.
  
• You understand how to use the medicine safely.

If Wegovy is not considered suitable, your healthcare professional may discuss other evidence-based weight management options that better meet your needs.

Ongoing Support Throughout Treatment

Starting treatment is only the beginning of your weight management journey.

Regular follow-up reviews help ensure your treatment continues to meet your needs and remains appropriate over time.

Depending on your provider, ongoing support may include:

• Reviewing your progress
  
• Monitoring side effects
  
• Discussing dose adjustments where appropriate
  
• Providing guidance on healthy eating and physical activity
  
• Assessing whether treatment should continue

These regular check-ins provide an opportunity to ask questions, discuss any concerns and receive personalised advice throughout your treatment journey.

Is Wegovy® Injection Right for You?

Wegovy is a POM that is ..prescribed for weight management in eligible adults when used alongside a reduced-calorie diet and increased physical activity, Yet, as is the case with all POM’s Wegovy is not appropriate for everyone. Your eligibility for treatment will be assessed by a registered medical professional who will evaluate your health, medical history, current medication history and BMI. An online consultation is a key part of your assessment to ensure you can be prescribed Wegovy reasonably and safely.

Who May Be Eligible for Wegovy®?

Wegovy may be considered for adults who meet the licensed prescribing criteria in the UK.

It was approved for obesity treatment in September 2023 by the UK healthcare products regulatory agency.

This generally includes adults who:

• Have obesity, typically with a Body Mass Index (BMI) of 30 kg/m² or above, or
  
• Are overweight, typically with a BMI of 27 kg/m² or above, and have at least one weight-related medical condition.

Examples of weight-related conditions may include:

• High blood pressure
  
• Type 2 diabetes
  
• High cholesterol
  
• Obstructive sleep apnoea
  
• Cardiovascular disease
  
• Other obesity-related health conditions

Your healthcare professional will consider your overall health, current medications and medical history before deciding whether Wegovy is suitable.

Meeting the BMI criteria alone does not guarantee that Wegovy will be prescribed. Every treatment decision is made on an individual basis.

When Might Wegovy® Not Be Suitable?

Some people for whom Wegovy is an option might benefit from another approach.

Tell your healthcare professional if you:

• Are pregnant or planning to become pregnant
  
• Are breastfeeding
  
• Have previously had pancreatitis
  
• Have severe stomach or intestinal disorders
  
• Have kidney or liver disease
  
• Have diabetic retinopathy (an eye condition related to diabetes)
  
• Have experienced an allergic reaction to semaglutide or any ingredient in Wegovy
  
• Are taking medicines that may interact with Wegovy

Providing complete and accurate information during your consultation helps your healthcare professional decide whether Wegovy is the right treatment for you.

How Wegovy® May Support Weight Management

Wegovy is designed to support weight management as part of a broader treatment plan that includes a reduced-calorie diet and increased physical activity.

Semaglutide works by acting on natural appetite-regulating hormones in the body. For some people, this may make it easier to follow healthier eating habits.

When prescribed appropriately, Wegovy may help support:

Appetite Management

Some people find they feel less hungry between meals while using Wegovy, which may help them manage their daily calorie intake.

Everyone responds differently, and appetite changes can vary from person to person. Progress is often reviewed against your starting weight, as individual results can vary.

Feeling Fuller for Longer

Wegovy acts on GLP-1 receptors involved in regulating appetite and satiety.

Some people may notice they feel satisfied after eating smaller meals, which can support healthier portion control.

Building Sustainable Habits

Healthy lifestyle changes remain an important part of treatment.

For some people, Wegovy may support adherence to a reduced-calorie eating plan when used alongside healthy lifestyle changes.. To clarify the common question about Wegovy burn fat, it does not directly burn fat; it helps you eat less consistently, so fat loss can follow a calorie deficit.

A Once-Weekly Treatment Schedule

Wegovy is taken once a week, helping many people establish a consistent treatment routine.

Using the medicine on the same day each week can make it easier to remember your scheduled dose.

Ongoing Clinical Monitoring

Regular reviews with your healthcare professional help ensure that:

• Treatment remains appropriate
  
• Side effects are monitored
  
• Dose increases are made safely when needed
  
• Your progress can be reviewed over time

Individual responses to treatment vary, and your healthcare professional will discuss your progress during follow-up reviews.

Possible Side Effects of Wegovy®

Like all medicines, Wegovy can cause side effects, although not everybody experiences them.

Many side effects are mild to moderate and are most common when treatment begins or when the dose is increased. These side effects are commonly reported when treatment begins or when the dose is increased

If you experience persistent, severe or worrying symptoms, speak to your healthcare professional.

Common Side Effects

The most commonly reported side effects include:

• Nausea
  
• Vomiting
  
• Diarrhoea
  
• Constipation
  
• Stomach pain
  
• Indigestion
  
• Headache
  
• Tiredness
  
• Dizziness
  
• Reduced appetite

Your healthcare professional will usually increase your dose gradually, which may help reduce the likelihood of digestive side effects.

Managing Common Side Effects

The following measures may help some people manage digestive side effects:

• Eat smaller meals more often.
  
• Eat slowly and stop when you feel comfortably full.
  
• Avoid large, rich or fatty meals if they make symptoms worse.
  
• Drink enough water throughout the day.
  
• Continue taking Wegovy exactly as prescribed unless advised otherwise by your healthcare professional.

These suggestions may help some people, but everyone’s experience is different.

Serious Side Effects: When to Seek Medical Advice

Serious side effects are uncommon but require prompt medical attention.

Seek urgent medical advice if you experience:

Symptoms of Pancreatitis

Contact a healthcare professional immediately if you develop:

• Severe abdominal pain that does not go away
  
• Pain that spreads to your back
  
• Pain accompanied by nausea or vomiting

Signs of a Serious Allergic Reaction

Seek emergency medical help if you notice:

• Swelling of the face, lips, mouth or throat
  
• Difficulty breathing or swallowing
  
• Severe rash
  
• Feeling faint or dizzy

Severe Dehydration

Persistent vomiting or diarrhoea may lead to dehydration.

Contact your healthcare professional if you cannot keep fluids down or notice symptoms such as dizziness, weakness or reduced urination.

Important Safety Information

Before starting Wegovy, tell your healthcare professional if you have or have had:

• Kidney disease
  
• Liver disease
  
• Gallbladder disease or gallstones
  
• Pancreatitis
  
• Diabetic retinopathy
  
• Severe gastrointestinal disease
  
• Any allergies to medicines

Also tell your healthcare professional about any prescription medicines, over-the-counter medicines or supplements you are taking.

Some medicines may require additional monitoring while you are using Wegovy.

Pregnancy and Breastfeeding

Wegovy should not be used during pregnancy.

If you are planning to become pregnant, think you may be pregnant or become pregnant during treatment, speak to your healthcare professional as soon as possible.

Wegovy is also not recommended while breastfeeding, as it is not known whether semaglutide passes into breast milk.

Driving and Using Machines

Wegovy is not generally expected to affect your ability to drive or operate machinery.

However, if you also use insulin or certain medicines for diabetes, you may be at increased risk of low blood sugar (hypoglycaemia), which can affect concentration and reaction times.

If this applies to you, discuss safe driving with your healthcare professional.

Using Wegovy Safely

To help ensure safe treatment:

• Always use Wegovy exactly as prescribed.
  
• Never share your injection pen with another person.
  
• Do not increase or reduce your dose unless advised by your healthcare professional.
  
• Do not stop treatment without discussing it with your prescriber.
  
• Do not use Wegovy after its expiry date.
  
• Do not use a pen that appears damaged or has been stored incorrectly.

Following your prescribed treatment plan and attending regular clinical reviews can help your healthcare professional monitor your progress and ensure the medicine continues to be suitable for you.

Lifestyle Support

Prescription medicines are only one part of weight management.

Lifestyle measures remain an important part of weight management and may include:

• Nutritional guidance
  
• Regular physical activity
  
• Behavioural support
  
• Ongoing clinical reviews
  
• Healthy sleep habits

These measures remain important whether or not you are prescribed medication.

NHS Weight Management Services

Depending on your circumstances, you may also be eligible for NHS weight management services, which may include lifestyle programmes and, for some people, prescription treatments where clinically appropriate.

Frequently Asked Questions

What is Wegovy® Injection?

Wegovy® is a prescription weight loss medication that contains semaglutide. It is used to help eligible adults reach and maintain a healthy weight when combined with a reduced-calorie diet and regular physical activity. It is taken once a week and is prescribed to help eligible adults lose weight and keep it off when combined with a healthy, reduced-calorie diet and regular physical activity.

Is Wegovy available without a prescription?

No. Wegovy is a Prescription Only Medicine (POM) in the UK, so you will need to be assessed by a qualified healthcare professional before it can be prescribed.

How often do I inject Wegovy?

Wegovy is injected once a week, ideally on the same day each week. Your healthcare professional will explain how to use your injection pen correctly and advise you on your dosing schedule.

How long does treatment usually last?

Everyone’s journey is different. Some people use Wegovy for several months, while others may benefit from longer treatment. Your healthcare professional will review your progress regularly and help decide how long it’s appropriate for you.

Can I change my injection day?

Yes, in many cases you can. However, there needs to be enough time between doses. If you’d like to change your injection day, speak to your healthcare professional or pharmacist first so they can advise you safely.

What happens if I miss an injection?

If you miss an injection, follow the instructions in the Patient Information Leaflet or ask your healthcare professional for advice. Don’t take an extra dose to make up for the one you missed.

Do not take an extra dose to make up for a missed injection.

Can I take Wegovy with other medicines?

It depends on what you’re taking. Some medicines may need extra monitoring or dose adjustments while you’re using Wegovy. Always let your healthcare professional know about any prescription medicines, over-the-counter medicines, vitamins, or supplements before starting treatment.

Can I drink alcohol while using Wegovy?

Alcohol isn’t specifically banned while using Wegovy. However, it can make side effects like nausea or an upset stomach worse for some people. If you’re unsure, it’s best to speak to your healthcare professional.

Can I travel with Wegovy?

Yes. Just make sure you store your Wegovy pen according to the manufacturer’s instructions, especially if you’re travelling somewhere warm. If you’re going away for a longer trip, remember to take enough medication with you for the duration of your holiday.

Will I need regular reviews?

Yes. Regular reviews are an important part of treatment. They’ll help your healthcare professional monitor your progress, discuss any side effects, and make sure Wegovy is still the right option for you.

Can Wegovy be used during pregnancy?

No. Wegovy isn’t recommended during pregnancy. If you’re pregnant, think you might be pregnant, or are planning to become pregnant, speak to your healthcare professional as soon as possible.

Can I stop taking Wegovy whenever I want?

If you are thinking about stopping treatment, speak to your healthcare professional first. They can explain what to expect and help you decide on the best next steps for your long-term weight management.

Does Wegovy work for everyone?

Not always.Individual responses vary. Some people may notice changes in appetite and weight, while others may experience more gradual results. Your progress will depend on factors such as your overall health, lifestyle, and how consistently you follow your treatment plan.

Where can I read more about Wegovy?

For complete information about dosing, side effects, warnings and precautions, refer to the official Patient Information Leaflet and Summary of Product Characteristics (SmPC).

Start Your Online Consultation

If you’re considering Wegovy® Injection as part of your weight management plan, the first step is to complete a confidential online consultation.

A qualified UK healthcare professional will review your medical history, current health, medications and eligibility before deciding whether Wegovy is clinically appropriate for you.

If prescribed, your treatment will be dispensed by a registered UK pharmacy with clear guidance on how to use your injection safely.

Complete your online consultation today to find out whether Wegovy® Injection may be suitable for you.