Does BMI alone determine if I qualify?

BMI is the main cut-off used in FDA approvals. But doctors also consider your overall health, other conditions, medicines you already take, and what you want. If your BMI is borderline, the conversation with your doctor still matters.

I have a BMI of 27 with type 2 diabetes. Do I qualify?

Yes. Type 2 diabetes is one of the qualifying conditions listed in FDA approvals for GLP-1 medications at BMI 27+. It is one of the reasons orforglipron (Foundayo) and semaglutide are also approved to reduce heart risk in people with type 2 diabetes.

What if I am very muscular — is my BMI misleading?

BMI doesn't tell fat from muscle, so a very muscular person can have a high BMI without much body fat. In those cases doctors can use a waist measurement, a scan of fat and muscle, or their own judgement. Bring this up with your doctor if it applies to you.

Can children or teenagers use these medications?

Some GLP-1 medications have been approved for use in adolescents. Semaglutide (Wegovy) is FDA-approved for ages 12+. Tirzepatide and orforglipron do not currently have approvals for children or teenagers. This is a specialist decision. Talk to a doctor who specialises in children's hormone health.

I have a thyroid condition. Am I automatically excluded?

Not necessarily. For GLP-1 drugs, the contraindication applies specifically to medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia type 2 (MEN 2). It does not apply to thyroid disease in general. Hypothyroidism (an underactive thyroid) is not a contraindication. Your doctor will look at your own history.

Am I Eligible for Weight Loss Medication?

BMI eligibility at a glance

Under 27

Not typically eligible

BMI 27–29.9

Eligible with a qualifying condition

BMI 30–39.9

Eligible — all drugs

BMI 40+

Eligible — all drugs

A doctor makes the final decision. This shows the general FDA-approved cut-offs.

Check your BMI

Enter your height and weight to see your number, and whether you would likely meet the standard criteria. This is a guide only. A doctor makes the final decision.

BMI Calculator

Height

Feet

Inches

Weight

Pounds

Standard FDA eligibility criteria

BMI ≥ 30

Classified as obesity. Eligible for all FDA-approved weight loss medications, whether or not other health conditions are present.

— OR —

BMI ≥ 27 with at least one qualifying condition

Type 2 diabetesHigh blood pressureHigh cholesterolObstructive sleep apnoeaHeart disease

Source: FDA approved indications + WHO GLP-1 guideline 2024 [1]

Reasons your doctor might say no

Medullary thyroid carcinoma (MTC)

Affects: All GLP-1 class drugs

Personal or family history of this rare thyroid cancer. The FDA requires a serious warning on the label because animal studies showed a thyroid tumour risk with GLP-1 drugs.

MEN 2 syndrome

Affects: All GLP-1 class drugs

Multiple Endocrine Neoplasia type 2. It is an inherited condition that makes thyroid and other hormone-related tumours more likely.

Pregnancy

Affects: Phentermine/topiramate (black box) and GLP-1s (not studied)

Phentermine/topiramate causes birth defects, so it cannot be used. GLP-1s are not approved for pregnancy.

Active opioid use

Affects: Naltrexone/bupropion (Contrave)

Naltrexone blocks how opioids work in your body. Taking it while on opioids causes immediate withdrawal.

History of seizures

Affects: Naltrexone/bupropion

Bupropion makes seizures more likely — not suitable for people with a seizure history.

Glaucoma or overactive thyroid

Affects: Phentermine/topiramate

Phentermine is a stimulant, so it is not suitable in narrow-angle glaucoma or an overactive thyroid.

BMI isn't perfect

Does not tell fat from muscle. A very muscular person may be above the cut-off without much body fat
Some Asian populations face risk to their metabolic health at lower BMI levels (some guidelines use ≥25 or ≥27)
Does not capture where fat is stored. Belly fat carries more health risk than fat elsewhere

Think you might qualify? Next step: talk to your doctor

Find out what to bring to the appointment, how to open the conversation, and what to do if your GP does not know the current treatments.

How to talk to your doctor →

Written and maintained by one person · Built with agentic AI tools · Every number checked against the cited trial · Not medical advice

How this site is built →

What if you do not meet these criteria?

Not qualifying for medication does not mean you are out of options. Lifestyle approaches work for everyone, and they are the foundation of managing weight over the long term.

Diet strategies →Exercise →Supplements →Lifestyle overview →

Next step most people take

How to talk to your doctorWhat to bring, what to say, and how to navigate common barriers Compare treatment optionsSee all your options side by side Lifestyle approachesDiet, exercise, and supplements — what works without medication

Built with agentic AI tools and not a substitute for medical advice

Last reviewed: September 2026

Was this page helpful?

Medical disclaimer: This website is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any treatment. Prices shown are United States self-pay or list prices and vary by insurance and country.