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Wegovy

Wegovy Online UK

Active Ingredient: Semaglutide
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The medical information on this site has been reviewed by Dr. Ross Elledge (GMC registered) and is provided for educational purposes. It does not replace a face-to-face consultation with your GP or specialist. Always follow the advice of your prescribing doctor and read the patient information leaflet supplied with your medication.

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About This Medicine

Wegovy contains semaglutide. This is a glucagon-like peptide-1 (GLP-1) receptor agonist, a medicine that works like a natural gut hormone.

You take it as an injection under the skin (subcutaneous) once a week for long-term weight management. Doctors prescribe it for adults with obesity, which means a BMI of 30 kg/m2 or greater.

They also prescribe it for adults who are overweight, with a BMI of 27 kg/m2 or greater, who have at least one weight-related health problem.

These problems include type 2 diabetes, high blood pressure (hypertension), abnormal blood fats (dyslipidaemia), or pauses in breathing during sleep (obstructive sleep apnoea).

You use Wegovy alongside a reduced-calorie diet and more physical activity.

Semaglutide copies a natural hormone called GLP-1. Your gut releases this hormone after you eat. It acts on parts of the brain that control appetite and how much you eat.

As a result, you feel full sooner and feel less hungry. It also slows down how fast your stomach empties, so you eat less. Together, these effects lead to clear weight loss.

The STEP clinical trial programme showed strong results. People taking semaglutide 2.4 mg each week lost about 15% of their starting body weight over 68 weeks.

This is much more than older weight management medicines achieved. Wegovy is a major step forward in treating obesity with medicine.

Usage & Dosage

You take Wegovy as an injection under the skin once a week. Use it on the same day each week, at any time of day, with or without food. Inject into your tummy (abdomen), thigh, or upper arm.

Change the injection site each week. Your dose goes up slowly over 16 weeks until you reach the maintenance dose. This gradual increase lowers the risk of stomach and gut side effects.

If you miss a dose and your next dose is more than two days away, inject as soon as you can. If your next dose is closer than that, skip the missed dose and go back to your usual schedule.

Your dose goes up step by step. In weeks 1 to 4, you take 0.25 mg once a week. In weeks 5 to 8, you take 0.5 mg. In weeks 9 to 12, you take 1 mg. In weeks 13 to 16, you take 1.7 mg.

From week 17 onwards, you take 2.4 mg, which is the maintenance dose. If you cannot tolerate the maintenance dose, your prescriber may reduce it to 1.7 mg once a week.

You do not need a dose change if you have kidney (renal) or liver (hepatic) problems. Wegovy is not recommended if you have severe disease of the stomach or gut.

Side Effects

Very common (more than 1 in 10): feeling sick (nausea), diarrhoea, being sick (vomiting), constipation, tummy pain, headache, tiredness, and indigestion (dyspepsia).

These happen most often while your dose is going up. They usually ease over time.

Common (1 in 10 to 1 in 100): dizziness, wind (flatulence), acid reflux (gastro-oesophageal reflux), burping (eructation), reactions where you inject, hair loss (alopecia), low blood sugar (hypoglycaemia, especially if you also take sulfonylureas or insulin), and gallbladder problems including gallstones (cholelithiasis).

Uncommon (1 in 100 to 1 in 1,000): inflammation of the pancreas (pancreatitis), a faster heartbeat, and sudden kidney damage (acute kidney injury, caused by dehydration from stomach and gut side effects).

Rare: thyroid C-cell tumours. These were seen in rodent studies, and it is not clear what they mean for people.

Warnings & Precautions

Pancreatitis, which means inflammation of the pancreas, has been reported with GLP-1 receptor agonists. Stop Wegovy if pancreatitis is suspected. Do not restart it if pancreatitis is confirmed.

Do not use semaglutide if you or a family member has had medullary thyroid carcinoma (a type of thyroid cancer) or multiple endocrine neoplasia syndrome type 2.

Watch for gallbladder problems, especially during fast weight loss. Drink enough fluids to lower the risk of kidney problems from vomiting or diarrhoea.

If you take insulin or sulfonylureas, you may need a lower dose to avoid low blood sugar (hypoglycaemia). Stop Wegovy at least two months before you plan to become pregnant.

Contraindications

Do not use Wegovy if you or a family member has had medullary thyroid carcinoma (a type of thyroid cancer) or multiple endocrine neoplasia syndrome type 2.

Do not use it if you are allergic to semaglutide or any other ingredient. Do not use it during pregnancy or while breastfeeding.

You should also not use it if you have a history of pancreatitis where the risks outweigh the benefits.

Frequently Asked Questions

How much weight can I expect to lose with Wegovy?
In clinical trials, people lost about 15% of their body weight over 68 weeks. This was when they used Wegovy together with diet and exercise. Results vary from person to person. To keep the weight off, you need to stick with your lifestyle changes.
What happens if I stop taking Wegovy?
Studies show that many people put weight back on after they stop semaglutide. Wegovy is meant to be a long-term treatment. Your prescriber will talk through a plan for ongoing weight management. This plan should always include changes to your diet and physical activity.
Can I use Wegovy if I have type 2 diabetes?
Yes. Semaglutide helps control your blood sugar as well as lowering your weight. But if you also take insulin or a sulfonylurea, you may need to lower the dose of your diabetes medicine. This helps prevent low blood sugar (hypoglycaemia). Talk to your prescriber before you start.
Why do I feel nauseous on Wegovy?
Feeling sick (nausea) is the most common side effect. It happens because semaglutide slows down how fast your stomach empties and acts on appetite centres in the brain. It is usually worst while your dose is going up, and it improves within weeks. Eating smaller meals and avoiding high-fat foods may help.
Is Wegovy the same as Ozempic?
Both contain semaglutide, but doctors prescribe them for different reasons. Ozempic (up to 2 mg) is licensed for type 2 diabetes. Wegovy (2.4 mg) is licensed only for long-term weight management. You should not swap one for the other.

Related articles: Wegovy

side-effects

Wegovy side effects: a doctor's guide to what to expect

Wegovy (semaglutide 2.4 mg) commonly causes gastrointestinal side effects including nausea, diarrhoea, and constipation, particularly during dose escalation. Most side effects are mild to moderate and improve over time. Serious but rare risks include pancreatitis and gallbladder disease. Following the recommended dose escalation schedule helps minimise symptoms.

dosage

Wegovy dosage: the complete escalation and maintenance guide

Wegovy uses a 16-week dose escalation schedule, starting at 0.25 mg weekly and increasing to the maintenance dose of 2.4 mg weekly. The gradual increase helps your body adjust and reduces gastrointestinal side effects. Wegovy is administered as a once-weekly subcutaneous injection using a pre-filled pen.

weight-loss

Wegovy weight loss: real results from clinical trials and UK practice

Clinical trials show that patients taking Wegovy lose an average of 12 to 15 per cent of their body weight over 68 weeks. This equates to roughly 15 to 20 kg for a person weighing 120 kg. Weight loss begins within the first month and continues steadily, with the greatest rate of loss occurring between months 3 and 9. Sustained weight management requires ongoing lifestyle changes alongside medication.

Overview

GLP-1 medications explained: how they work and which is right for you

GLP-1 receptor agonists are medicines that copy a gut hormone called GLP-1. They lower blood sugar and reduce appetite. They include semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro) and liraglutide (Saxenda). These medicines have changed how doctors treat type 2 diabetes and obesity, and the benefits are proven in trials.

Medically Reviewed

Dr. Ross Elledge

Consultant Surgeon · Oral & Maxillofacial Surgery

Verified Healthcare Professional