Can You Get Weight Loss Injections If Not Overweight? (October 2026)

01 · The rules

What BMI do you need for weight loss injections?

You need a BMI of 30 or above, or between 27 and 30 with at least one weight-related condition. Qualifying conditions include high blood pressure, high cholesterol, obstructive sleep apnoea, cardiovascular disease, prediabetes or type 2 diabetes. Treatment must be used alongside a reduced-calorie diet and increased physical activity.¹

If you are unsure of your BMI, our free consultation is the place to start. Related guides cover how overweight you need to be and what weight qualifies.

02 · NHS and private

NHS versus private access

Mounjaro is available on the NHS, but access is phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus a weight-related condition, and the primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁴ Private treatment follows the licensed criteria. Either way, being under the threshold does not qualify you.

If you meet the criteria, the Mounjaro pen starts at £169.99 for the 2.5mg pen, and new customers can use code FIRST40 to save £40 on their first order. You can also buy Mounjaro after approval. Prices checked 11 October 2026.

03 · Why prescribers say no

Why prescribers decline at a healthy weight

The licence and the trial evidence both relate to adults with overweight or obesity. In SURMOUNT-1, 2,539 adults on tirzepatide lost on average 15% of body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, versus 3.1% with lifestyle changes alone. Individual results vary.²

Mounjaro is licensed for weight management in adults with overweight or obesity, so prescribing it at a normal BMI would be outside the licence. Our guides on getting Mounjaro if not overweight and GLP-1 medicines if not overweight cover this further.

04 · Risks of taking it anyway

What happens if you take it without need

Mounjaro slows stomach emptying, and the most common early effects are mild nausea, altered appetite and tiredness in the first days after each injection.¹ It can also affect how quickly some oral medicines are absorbed, so your prescriber needs to know everything you take.¹

Sellers offering to supply without a consultation or prescription are a red flag. Buy only from a registered pharmacy, which you can check on the GPhC register. Serious side effects are uncommon but need urgent attention. Seek immediate medical help for severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin or eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. Report suspected side effects through the Yellow Card scheme.¹⁹

05 · Alternatives to consider

Alternatives if you do not qualify

Start with your GP, who can look at diet, activity and any health concern behind your wish to lose weight. Low-cost supplements sold as "poor man's Ozempic" carry no clinical oversight, and dosing is not standardised, so they are no substitute for a licensed medicine. Our weight loss treatments overview and guide to weight loss medication if not obese explain the options, and Mounjaro and not being overweight goes deeper.

06 · How ordering works

How ordering works if you qualify

First, complete a free online consultation, with no charge or obligation. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full. Our registered pharmacy then dispenses and ships with free next-day tracked delivery, with same-day dispatch when ordered by 3pm. Ongoing monthly reviews are included.