BMI Requirements

Body Mass Index (BMI) is a simple, widely used screening tool to estimate body fat based on an individual's height and weight.

Eligibility for weight loss medications varies by treatment and provider. Below are general BMI thresholds based on UK guidelines and private pharmacy criteria:

•  NHS (since June 2025):

•  BMI ≥ 40, or BMI ≥ 35 with multiple weight related conditions (e.g. type 2 diabetes, hypertension).

•  Availability is limited; many opt for private prescriptions due to strict NHS rules.

•  Private Prescriptions:

•  BMI ≥ 30, or BMI ≥ 27 with comorbidities (e.g. high cholesterol), depending on the medication and pharmacy consultation.

•  Examples: Mounjaro (BMI ≥ 30), Wegovy (BMI ≥ 30), Saxenda (BMI ≥ 30), Orlistat (BMI ≥ 28 with existing health conditions).

Note: These are general guidelines. GPhC-verified UK pharmacies require an online consultation to confirm eligibility. Always consult your GP or a healthcare professional for personalised advice.

•  Underweight: BMI < 18.5

•  Normal Weight: BMI 18.5–24.9

•  Overweight: BMI 25–29.9

•  Obese Class I: BMI 30–34.9

•  Obese Class II: BMI 35–39.9

•  Obese Class III: BMI ≥ 40

Most weight loss treatments target BMI 30+ or higher, especially for those who have other health conditions.

Use the tool below to estimate your BMI and see where you stand. This is for informational purposes only.