Weight Loss Medications That Are Affordable in the UK (October 2026)

01 · Decision

Affordable options compared

The cheapest route is not always the best value, because low-cost products differ hugely in evidence and oversight.

For other cheap products, such as orlistat, figures vary and your prescriber or pharmacist can advise. Browse all weight loss treatments.

02 · Price

What Mounjaro costs with us

The Mounjaro pen costs £169.99 at the 2.5mg starting dose. A new customer gets £40 off their first order at any dose with code FIRST40, and an automatic £25 reorder discount applies to every future order (code DOSE25). Switching at 15mg? Your first order is £289.99.

If you step up after 4 weeks on each dose, your first four pens (2.5mg to 10mg) cost £959.96 at standard prices. A first year costs £2,711.88 if you stay on 5mg after your 2.5mg starting pen, up to £3,599.88 if you step up through every dose to 15mg. Our Mounjaro discount code guide explains the savings. Klarna and pay-monthly options are available, with no subscription lock-in.

Our consultation is free, and the price shown is the price paid. Every order is reviewed by a GPhC-registered prescriber, and unsuitable orders are refunded automatically. We supply genuine KwikPens through official LillyDirect supply, with free next-day tracked delivery.

Related guides: Medications that cause unintentional weight loss and Medications that help with pcos weight loss and Medications that prevent weight loss.

03 · Is Mounjaro suitable?

Who Mounjaro is licensed for

Mounjaro is licensed for weight management in adults with a BMI of 30 or above, or between 27 and 30 with at least one weight-related condition such as high blood pressure, high cholesterol, obstructive sleep apnoea, cardiovascular disease, prediabetes or type 2 diabetes. It must be used alongside a reduced-calorie diet and increased physical activity.¹ A prescriber assesses your BMI, medical history and current medicines first.

Tell them about everything you take, especially warfarin, insulin or sulfonylureas, where doses may need reducing to avoid low blood sugar.¹ Mounjaro must not be used during pregnancy, and it should be stopped at least one month before trying to conceive. Mounjaro slows stomach emptying, which can reduce how well oral contraceptive pills are absorbed: switch to a non-oral method, or add a barrier method (such as condoms), for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase.

04 · What the evidence shows

What you get for the money

In SURMOUNT-1, 2,539 adults taking tirzepatide alongside diet and exercise 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.² For someone starting at 100 kg, 20.9% is about 21 kg. These are trial averages, and individual results vary.

Tirzepatide activates both GIP and GLP-1 receptors, helping regulate appetite and slow stomach emptying.¹

05 · NHS access

The NHS route

Mounjaro is available on the NHS, but access is being phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one 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.⁴⁶ Many people who meet the licensed criteria choose regulated private treatment rather than waiting.

06 · Avoiding counterfeits

Cheap should never mean unregulated

Very low prices from sellers offering to supply without a consultation or prescription are a warning sign. Check any pharmacy on the GPhC register; ours is 9012878. Report suspected counterfeits or side effects through the Yellow Card scheme.⁷

Also see medications that cause weight loss and other online providers.