Tirzepatide Weight Loss: Everything You Need to Know

What Is Tirzepatide?

Tirzepatide is a groundbreaking weight loss medication that targets two key hormones simultaneously: GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide). This dual-action mechanism makes it one of the most powerful prescription treatments for weight loss currently available. At Metabolic Slim Clinic, our doctors work with eligible patients to determine if tirzepatide could be the right choice for their weight management journey. In the UK, tirzepatide for weight loss is available under the brand name Mounjaro.

How Tirzepatide Works for Weight Loss

Unlike semaglutide, which activates only GLP-1 receptors, tirzepatide activates both GLP-1 and GIP receptors. This dual receptor agonism has a synergistic effect on appetite suppression, insulin sensitivity, and fat burning. In simple terms, tirzepatide tells your brain you are full sooner, keeps food in your stomach longer, and helps your body use energy more efficiently.

The result? Patients tend to eat considerably less without feeling deprived, and their metabolism shifts in a way that promotes sustained fat loss.

Clinical Trial Results: The SURMOUNT Programme

The SURMOUNT clinical trial programme has produced remarkable results that have excited the medical community. In SURMOUNT-1, participants taking the highest dose of tirzepatide (15 mg) lost an average of 20.9% of their body weight over 72 weeks. Nearly half of all participants achieved weight loss of 20% or more.

To put this in perspective, someone weighing 100 kg could expect to lose approximately 20 kg — a level of weight loss that previously required bariatric surgery. Tirzepatide represents a true paradigm shift in how we think about non-surgical weight management.

Tirzepatide vs Semaglutide: Which Is Better?

Head-to-head comparisons between tirzepatide and semaglutide consistently show that tirzepatide produces greater weight loss on average. The SURMOUNT-5 trial directly compared the two medications and found that tirzepatide led to approximately 47% more weight loss than semaglutide.

However, the “best” medication depends on the individual. Factors such as your health history, other medications, cost, and how your body responds to treatment all play a role. Our doctors will help you weigh up these factors during your consultation.

Dosing and Administration

Tirzepatide is given as a once-weekly subcutaneous injection. The starting dose is 2.5 mg per week, with gradual increases every four weeks as tolerated:

• Weeks 1–4: 2.5 mg weekly
• Weeks 5–8: 5 mg weekly
• Weeks 9–12: 7.5 mg weekly
• Weeks 13–16: 10 mg weekly
• Weeks 17–20: 12.5 mg weekly
• Week 21 onwards: 15 mg weekly (maximum dose)

Not all patients need to reach the maximum dose. Our clinical team monitors your progress and adjusts your dose based on your individual response and tolerability.

Who Qualifies for Tirzepatide?

Tirzepatide for weight management is typically prescribed to adults with a BMI of 30 or higher, or a BMI of 27 or higher with weight-related conditions such as type 2 diabetes, hypertension, or dyslipidaemia. A full medical assessment is required before starting treatment.

Side Effects to Be Aware Of

The most common side effects of tirzepatide are similar to those seen with other GLP-1 medications and primarily affect the gastrointestinal system:

• Nausea (particularly in the early weeks)
• Diarrhoea
• Vomiting
• Decreased appetite
• Constipation

These effects are usually mild to moderate and tend to subside as your body adapts. Starting at a low dose and increasing gradually is the key to managing these side effects effectively.

Tirzepatide at Metabolic Slim Clinic

At Metabolic Slim Clinic, tirzepatide is prescribed as part of a comprehensive, medically supervised programme. You will receive ongoing support from our doctors, personalised nutrition guidance, and regular check-ins to track your progress.

Contact us today to find out whether tirzepatide could be the breakthrough you have been waiting for.