Weight Loss Injections UK 2025
Everything you need to know about GLP-1 weight loss injections in the UK — what they are, how they work, which is most effective, and how to get them at the best price.
UK Weight Loss Injections Compared
Mounjaro (Tirzepatide)
The newest and most effective weight loss injection available in the UK. Mounjaro targets both GIP and GLP-1 receptors, producing greater weight loss than any other approved treatment.
Wegovy (Semaglutide 2.4mg)
The first GLP-1 injection licensed specifically for weight loss in the UK. Wegovy is now available through some NHS specialist clinics and widely available privately.
Ozempic (Semaglutide)
Licensed for type 2 diabetes in the UK, Ozempic is sometimes prescribed off-label for weight loss. Wegovy (same drug, higher dose) is the preferred option for weight management.
Saxenda (Liraglutide)
An older GLP-1 injection requiring daily administration. Saxenda is still prescribed in the UK but has largely been superseded by once-weekly options like Wegovy and Mounjaro.
Side-by-Side Comparison
| Feature | Mounjaro | Wegovy | Ozempic | Saxenda |
|---|---|---|---|---|
| Mechanism | GIP + GLP-1 | GLP-1 | GLP-1 | GLP-1 |
| Frequency | Once weekly | Once weekly | Once weekly | Once daily |
| Avg weight loss | ~20% | ~15% | ~6–14% | ~8% |
| UK licensed (weight) | ✓ | ✓ | ✗ | ✓ |
| NHS available | ✗ | ✓ | ✗ | ✗ |
| Price range | £129 – £249/pen | £149 – £259/pen | £80 – £150/pen | £180 – £250/month |
How Do Weight Loss Injections Work?
Weight loss injections work by mimicking naturally occurring gut hormones called GLP-1 (glucagon-like peptide-1) and, in the case of Mounjaro, also GIP (glucose-dependent insulinotropic polypeptide). These hormones are released after eating and signal to the brain that you are full.
By activating these hormone receptors, GLP-1 medications slow gastric emptying (food stays in your stomach longer), reduce appetite, lower blood sugar levels, and decrease food cravings. The result is a significant reduction in calorie intake, leading to sustained weight loss over weeks and months.
Mounjaro's dual GIP + GLP-1 action is believed to be why it achieves greater weight loss than GLP-1-only medications like Wegovy and Saxenda. The GIP receptor activation appears to enhance the appetite-suppressing and metabolic effects of GLP-1 stimulation.
Weight Loss Injections UK — FAQs
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