GLP-1 receptor agonists (often shortened to GLP-1 RAs) are a class of injectable medications that mimic the action of a natural gut hormone called glucagon-like peptide-1. Originally developed for type 2 diabetes, they have become some of the most effective tools for weight management as well.
How Do They Work?
When you eat, your gut releases GLP-1, which triggers a cascade of metabolic effects:
- Insulin secretion — GLP-1 tells your pancreas to release insulin, but only when blood sugar is elevated, reducing the risk of hypoglycaemia
- Glucagon suppression — it dampens the release of glucagon, a hormone that raises blood sugar
- Slower gastric emptying — food moves through your stomach more slowly, making you feel full for longer
- Appetite reduction — GLP-1 receptors in the brain's appetite centre reduce hunger and cravings
GLP-1 medications are synthetic versions of this hormone, engineered to last much longer in the body than the natural version (which breaks down within minutes).
GLP-1 Medications Available in the UK
Several GLP-1-based treatments are currently available to UK patients:
- Ozempic (semaglutide) — weekly injection, primarily for type 2 diabetes
- Wegovy (semaglutide 2.4 mg) — weekly injection, licensed for weight management
- Saxenda (liraglutide) — daily injection for weight management
- Mounjaro (tirzepatide) — weekly injection, a dual GLP-1/GIP agonist for diabetes and weight management
- Trulicity (dulaglutide) — weekly injection for type 2 diabetes
Are They Safe?
GLP-1 medications have been extensively studied in large clinical trials and have well-established safety profiles. Common side effects are primarily gastrointestinal — nausea, vomiting, diarrhoea, and constipation — and usually improve over time. Serious side effects are uncommon but can include pancreatitis and gallbladder problems. All GLP-1 medications in the UK are prescribed and monitored by healthcare professionals.
Who Are They For?
In the UK, GLP-1 medications are typically prescribed to:
- Adults with type 2 diabetes who haven't achieved adequate blood sugar control with oral medications alone
- Adults with obesity or overweight (with weight-related comorbidities) who haven't achieved sufficient weight loss through lifestyle changes
Cost and Access
NHS access depends on the specific medication, your diagnosis, and local commissioning policies. Many patients opt for private prescriptions, particularly for weight management. Prices vary significantly between UK pharmacies, so comparing costs on MedsLens before purchasing is always worthwhile.
The Bottom Line
GLP-1 medications represent a significant advance in treating obesity and diabetes. If you're considering starting one, discuss the options with your prescriber to find the best fit for your needs and circumstances.