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An Introduction to Weight Loss
Introduction to Weight Loss Injections
Weight loss injections are one of several evidence based tools that can support people who are struggling to lose weight through lifestyle changes alone. They are not a quick fix, and they work best when combined with healthy eating, regular movement, and behaviour change. For many people, they provide the extra support needed to break long standing patterns, reduce hunger, and make sustainable progress.
How Weight Loss Injections Work
Most licensed weight loss injections work by mimicking natural hormones in the body that help regulate appetite and digestion. These medicines act on areas of the brain involved in hunger and fullness, helping people:
• Feel satisfied sooner
• Experience fewer cravings
• Reduce portion sizes
• Maintain a lower calorie intake more comfortably
Some also slow stomach emptying, which helps people feel fuller for longer.
These effects make it easier to adopt healthier habits and stick to a reduced calorie diet — which is essential for long term success.
Who They Can Be Prescribed For?
Weight loss injections may be considered for adults who meet specific clinical criteria. Typically, they can be prescribed for people who:
• Have a BMI of 30 or above, or
• Have a BMI of 27 or above with a weight related health condition such as high blood pressure, high cholesterol, pre diabetes, or sleep apnoea
They are most suitable for individuals who:
• Have struggled to lose weight despite lifestyle changes
• Are motivated to adopt healthier habits
• Are willing to engage in regular follow up and monitoring
• Understand that medication is only one part of a wider treatment plan
A full clinical assessment is always required to ensure safety and suitability.
Medicines Commonly Used
Several medicines are licensed for medical weight management. These include:
GLP 1 receptor agonists
These mimic the body’s natural “fullness” hormone.
• Liraglutide (daily injection)
• Semaglutide (weekly injection)
Dual action medicines
These target more than one appetite regulating pathway.
• Tirzepatide (weekly injection) — depending on local licensing and availability
Each medicine has its own dosing schedule, safety profile, and suitability criteria. A prescribing clinician will determine which option is appropriate based on medical history, current health, and individual goals.
How They Are Administered?
Weight loss injections are given subcutaneously, meaning they are injected just under the skin. They are not injected into muscle or veins.
Administration is usually:
• Once daily (e.g., liraglutide), or
• Once weekly (e.g., semaglutide or tirzepatide)
Most people inject into the:
• Abdomen
• Thigh
• Upper arm
The injections are delivered using a pre filled pen device with a very fine needle. Patients are shown how to use the pen safely and confidently, and most find the process quick and manageable.
The Importance of Lifestyle Change
Medication alone is not enough. For safe and effective weight loss, patients must also commit to:
• A reduced calorie diet
• Regular physical activity
• Behavioural change strategies
• Ongoing monitoring and support
This combination leads to the best long term outcomes and helps people maintain their progress once treatment ends.
What Are the Benefits?
Many people notice:
• Reduced appetite and fewer cravings
• More control around food
• Steady, sustainable weight loss
• Improved energy
• Less joint pain
• Better confidence
• Improved health markers (such as blood pressure or blood sugar)
Everyone’s journey is different, and progress happens at different speeds — but small steps add up.
Is It Safe?
Weight loss injections are licensed medicines that have been studied in clinical trials. Like all medicines, they can cause side effects, which will be discussed during your consultation.
