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Understanding treatment options

Medicines information

Our approach covers nutrition, physical activity and behavioural support and, for some eligible adults, prescription treatment. This page explains medicines you may have heard about. It isn't a recommendation or an offer to supply any particular medicine.

The medicines Using your injection pen Safety and suitability
Semaglutide · prescription-only medicine

Wegovy®

Wegovy contains semaglutide, a GLP-1 receptor agonist. It's authorised for weight management in eligible patients alongside a reduced-calorie diet and more physical activity.

  • Usually injected once a week, following the instructions you're given.
  • The dose is normally increased gradually to help your body adjust.
  • Common side effects include nausea, vomiting, diarrhoea and constipation.

Your prescriber reviews your medical history, other medicines, relevant risks and the current UK product information before deciding whether it's suitable.

Read the official UK medicine information
Tirzepatide · prescription-only medicine

Mounjaro®

Mounjaro contains tirzepatide, which acts on both GIP and GLP-1 receptors. It's authorised for weight management in eligible adults alongside a reduced-calorie diet and more physical activity.

  • Usually injected once a week, following the instructions you're given.
  • The dose is normally increased gradually, based on the product information and how well you tolerate it.
  • Common side effects include nausea, diarrhoea, vomiting and constipation.

Extra precautions may apply. For example, it can make oral contraception less reliable when you start treatment and after each dose increase.

Read the official UK medicine information
For patients already prescribed treatment

How to use your injection pen

New to injecting? These step-by-step videos can help you get familiar with your pen. Choose the one for the exact medicine and pen you've been prescribed, and always read the instructions that come with your medicine.

Wegovy® FlexTouch® pen video The manufacturer's UK video on preparing and using the multi-dose pen. Novo Nordisk UK · opens an external site Mounjaro® KwikPen® video A pharmacist-reviewed UK demonstration covering preparation, injection technique and safe disposal. NowPatient · opens an external site

Videos don't replace your leaflet or proper training. Different pens work differently, even for the same medicine, so don't learn from a video of a US single-dose pen if you have a UK multi-dose pen. If you're unsure how to take your dose, speak to your pharmacist or prescriber before injecting. External sites may have their own privacy and cookie policies.

Your safety first

Safety and suitability

Neither medicine is right for everyone. Treatment is only chosen after a clinical assessment, and any prescription is dispensed by an independent UK-registered pharmacy.

What we check

Pregnancy or breastfeeding plans, any history of pancreatitis, digestive conditions, your other medicines, and risks linked to diabetes treatment.

Diabetes

People with stable, well-controlled type 2 diabetes may be considered after an individual assessment and, where needed, coordination with their diabetes team. We don't offer this service to people with type 1 diabetes.

Get urgent advice if you have

severe or persistent stomach pain, signs of a serious allergic reaction, or signs of dehydration. Call NHS 111, or 999 in an emergency.

No prescription is guaranteed. This information doesn't replace the patient information leaflet or advice from your clinician. Last reviewed: October 2026.

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