GLP-1 Medications: The Complete Guide to Weight Loss Injections in the UK

What Are GLP-1 Medications?

GLP-1 (glucagon-like peptide-1) receptor agonists are a class of prescription medications that mimic a hormone your body naturally produces after eating. Originally developed to treat type 2 diabetes, GLP-1 medications have revolutionised the field of weight management due to their remarkable ability to reduce appetite, slow digestion, and promote significant weight loss.

In the UK, several GLP-1 medications are now approved or available for weight management, and they are at the core of our treatment programmes at Metabolic Slim Clinic.

How GLP-1 Medications Work

When you eat, your gut releases GLP-1, which signals the brain to reduce appetite and the stomach to slow its emptying. GLP-1 receptor agonists amplify this effect continuously, not just after meals. The result is a sustained reduction in hunger, earlier feelings of fullness, and a natural reduction in calorie intake without the willpower battles that come with traditional dieting.

Beyond appetite suppression, GLP-1 medications also improve insulin sensitivity, lower blood sugar levels, and may have beneficial effects on the heart and kidneys.

Available GLP-1 Weight Loss Medications in the UK

Semaglutide (Wegovy / Ozempic)

Semaglutide is the most widely prescribed GLP-1 medication for weight loss in the UK. Wegovy (2.4 mg weekly) is specifically licensed for chronic weight management, while Ozempic (lower doses) is licensed for type 2 diabetes but also used off-label for weight loss.

Clinical trials show average weight loss of 14–17% of body weight over 68 weeks, significantly outperforming older weight loss medications.

Tirzepatide (Mounjaro)

Tirzepatide targets both GLP-1 and GIP receptors, making it even more powerful than standard GLP-1 medications. Clinical trials show average weight loss of up to 20.9% over 72 weeks — numbers that were previously only seen with bariatric surgery.

Mounjaro is licensed in the UK for type 2 diabetes and is increasingly used for weight management in carefully selected patients.

Liraglutide (Saxenda)

Liraglutide was the first GLP-1 medication widely used for weight management. It is given as a daily injection rather than weekly, and produces around 8% weight loss on average. It is generally considered less effective than semaglutide or tirzepatide but may be suitable for some patients.

Who Can Prescribe GLP-1 Weight Loss Medications?

GLP-1 medications must be prescribed by a qualified healthcare professional after a medical assessment. In the UK, this includes doctors, nurse prescribers, and pharmacist prescribers working within appropriate clinical governance frameworks.

At Metabolic Slim Clinic, all prescriptions are issued by our specialist doctors who have specific expertise in obesity medicine and metabolic health. We do not use automated prescribing systems — every patient is assessed individually.

Are GLP-1 Medications Safe?

GLP-1 medications have been studied extensively in large clinical trials involving tens of thousands of patients. Their safety profile is well-established. The most common side effects are gastrointestinal (nausea, vomiting, diarrhoea) and are generally mild to moderate, improving over time.

GLP-1 medications are not suitable for everyone. They are not recommended during pregnancy, for people with a personal or family history of medullary thyroid carcinoma, or for those with certain rare conditions. Your doctor will screen you for these during your initial assessment.

How to Get Started with GLP-1 Weight Loss Treatment

The process at Metabolic Slim Clinic is straightforward:

1. Book a consultation — speak with one of our doctors about your weight loss history and goals
2. Medical assessment — we review your health, medications, and BMI to determine eligibility
3. Personalised prescription — if appropriate, we prescribe the right GLP-1 medication and dose for you
4. Ongoing support — regular check-ins, nutrition guidance, and dose adjustments as needed

Ready to find out if GLP-1 treatment is right for you? Book your consultation with Metabolic Slim Clinic today.

Ready to get started? You can browse our full range of weight loss medications in the shop or read our frequently asked questions if you still have queries about eligibility, delivery, or how treatment works.