BMI and Other Requirements for Weight Loss Injections: What Generally Qualifies?

Eligibility for weight loss injections is not decided by BMI alone. Prescribers look at a combination of factors, and requirements can vary between countries and individual clinical settings.

BMI thresholds and weight criteria

Many prescribing guidelines set a minimum BMI — often 30 kg/m² or above. A lower threshold (commonly around 27 kg/m²) is frequently used when a person has at least one weight-related health condition such as type 2 diabetes, high blood pressure, or raised cholesterol. There is no universal single figure that applies everywhere; what qualifies in one healthcare system may differ in another. If you have questions about the specific threshold used in your case, speaking with your prescriber or doctor is the most reliable step.

Health conditions and contraindications

Certain conditions can make these medicines unsuitable for some people. Commonly cited contraindications include a personal or family history of medullary thyroid carcinoma, a diagnosis of Multiple Endocrine Neoplasia syndrome type 2, and known hypersensitivity to the active substance or any component of the medicine. Pregnancy, breastfeeding, or planning to conceive are also important considerations — always discuss these with your healthcare professional. This list is not exhaustive; your prescriber reviews your full medical history to assess suitability. For a detailed overview, the electronic Medicines Compendium (eMC) holds the full prescribing information for each medicine.

Who may not be suitable

Beyond the formal contraindications above, prescribers consider factors such as existing gastrointestinal conditions, certain kidney or liver concerns, and current medications that could interact. Age restrictions may also apply — these medicines are generally not prescribed for people under 18 unless a specialist directs otherwise. If you have concerns about whether the medicine is right for you, raise them directly with your prescriber rather than drawing conclusions from general information.

What about NHS requirements or national schemes?

Some national healthcare programmes — such as those in the UK — have their own specific eligibility criteria that may be more detailed than the general thresholds above. These can include requirements around previous weight management attempts or enrolment in a structured programme. Requirements vary by country and can change over time, so check with your own healthcare provider for up-to-date guidance relevant to where you live. For information on costs and access considerations, or to understand more about how these injectable medicines are administered, the linked pages cover those topics in more detail.

For a broader overview of everything to know about weight loss injections, including how they work and what to expect on the journey, visit the main guide.

Once you have been prescribed a weight loss injection, staying consistent and informed is where the real day-to-day work begins — and that is exactly what GLP Trackr is built for.

The most immediately useful feature for injection users is injection-site tracking and rotation. Every time you administer a dose, you can log the site (abdomen, thigh, or upper arm), and GLP Trackr keeps a rotation history so it can suggest your next site automatically. Rotating correctly reduces the risk of local skin reactions and is something your prescriber will have discussed with you. Having a clear log also makes it easy to recall exactly where your last injection was — no guesswork.

Alongside site tracking, dose logging means every injection is recorded with the date, time, and dose strength, and dose reminders help you stay on your once-weekly schedule without relying on memory alone. If you ever miss a dose and need to discuss it with your prescriber, the log gives you an accurate record to refer to.

For more on how injectable pens are used day-to-day, see the guide to using your injection pen. If cost or access is on your mind, the pages on finding affordable options and weight loss injection costs may be useful context.

Any questions about whether the medicine remains right for you, or about side effects or dose changes, should always go to your prescriber or doctor — they have your full history and can advise properly. GLP Trackr gives you a clear record to bring to those conversations; it is not a substitute for clinical guidance.

Ready to keep track of every injection, rotation, and dose in one place? GLP Trackr is free to try for 7 days — available now on the App Store and Google Play.