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.
Common side effects may include:
• Low blood sugar (hypoglycaemia)
• Feeling sick (nausea)
• Diarrhoea
• Being sick (vomiting)
• Stomach (abdominal) pain
• Constipation
During the consultation side effects will be discussed in more detail.