Semaglutide for Weight Loss: Complete Guide for 2026

What Is Semaglutide and How Does It Work?

Semaglutide is a GLP-1 receptor agonist originally developed to treat type 2 diabetes. In recent years, it has become one of the most prescribed medications for chronic weight management. At Metabolic Slim Clinic, we use semaglutide as part of a doctor-led, personalised weight loss programme designed to deliver real, lasting results. In the UK, semaglutide for weight loss is available under the brand name Wegovy.

The medication works by mimicking a hormone called glucagon-like peptide-1 (GLP-1), which the body naturally produces after eating. Semaglutide slows gastric emptying, reduces appetite, and helps regulate blood sugar levels — making it significantly easier to eat less and lose weight consistently.

Clinical Evidence: How Much Weight Can You Lose?

Large-scale clinical trials have demonstrated that semaglutide is highly effective for weight loss. The STEP trial programme, which studied thousands of participants over 68 weeks, showed that people using semaglutide alongside lifestyle changes lost an average of 14–17% of their body weight. This is significantly more than what most people achieve through diet and exercise alone.

What does that mean in practice? If you weigh 90 kg, you could expect to lose roughly 12–15 kg over the course of your programme. Some patients achieve even greater results, particularly when they combine semaglutide with a structured nutrition plan and regular physical activity.

Who Is a Candidate for Semaglutide?

Semaglutide is generally recommended for adults who meet one of the following criteria:

• A Body Mass Index (BMI) of 30 or higher (classified as obese)
• A BMI of 27 or higher with at least one weight-related health condition, such as type 2 diabetes, high blood pressure, or sleep apnoea

At Metabolic Slim Clinic, every patient undergoes a thorough medical assessment before starting treatment. Our doctors review your health history, current medications, and weight loss goals to determine whether semaglutide is the right fit for you.

What to Expect During Treatment

Semaglutide is administered once weekly via a small subcutaneous injection (just under the skin). Most patients find it easy to self-administer at home after a brief demonstration. The dose is gradually increased over several weeks to minimise side effects.

Here is a typical titration schedule:

• Weeks 1–4: 0.25 mg per week (starting dose)
• Weeks 5–8: 0.5 mg per week
• Weeks 9–12: 1.0 mg per week
• Weeks 13–16: 1.7 mg per week
• Week 17 onwards: 2.4 mg per week (maintenance dose)

Common Side Effects and How to Manage Them

Like all medications, semaglutide can cause side effects. The most common ones are gastrointestinal in nature:

• Nausea (most common, especially in the early weeks)
• Vomiting
• Diarrhoea or constipation
• Bloating or indigestion

These symptoms typically improve as your body adjusts to the medication. Eating smaller meals, avoiding high-fat foods, and staying well hydrated can all help. Our clinical team provides personalised guidance throughout your programme to help you manage any symptoms effectively.

Semaglutide vs Other Weight Loss Medications

There are several prescription weight loss medications available in the UK, including orlistat, liraglutide, and tirzepatide. How does semaglutide compare?

Compared to orlistat, semaglutide produces significantly greater weight loss and tends to be better tolerated. Compared to liraglutide (another GLP-1 agonist), semaglutide is more effective and only needs to be taken once weekly rather than daily. Tirzepatide, which targets both GLP-1 and GIP receptors, appears to produce slightly greater weight loss but is newer and not yet as widely available.

Maintaining Your Results After Semaglutide

One of the most common questions we hear is: “What happens when I stop taking semaglutide?” Research shows that weight regain is possible if the medication is stopped without maintaining lifestyle changes. This is why Metabolic Slim Clinic’s programme includes nutrition coaching, behavioural support, and a long-term maintenance plan.

Our goal is not just to help you lose weight — it is to help you build sustainable habits that keep it off for good. Many patients continue on a lower maintenance dose of semaglutide after reaching their target weight.

Start Your Journey at Metabolic Slim Clinic

If you are ready to explore whether semaglutide is right for you, our team of specialist doctors is here to help. We offer free initial consultations, flexible appointment options, and a fully personalised approach to weight management.

Book your consultation today and take the first step towards a healthier, lighter you.