Best Diet Pills UK - Get £40 Off with Code FIRST40

  • Save £40 instantly with exclusive discount code FIRST40
  • Prescription-only Mounjaro from £129.99 after discount
  • GPhC-registered UK pharmacy with 3-day standard approval
  • Free discreet delivery on all weight management orders
Start free consultation

Treatment from £144.99

Takes under 2 minutes · 100% online
Person enjoying the outdoors

Check if you're eligible

Height 175 cm
Weight 82 kg
Your BMI
26.8
Check with prescriber
Start free consultation
Free · BMI thresholds shown are illustrative. Final eligibility is confirmed by a UK prescriber during your free consultation.
100% UK-based pharmacy Free advice & support Rated Excellent 2,400+ reviews
Which route suits you

Two clinically backed paths to results

A weekly GLP-1 injection or a daily capsule — each fully overseen by our UK pharmacy team, with no obligation to continue.

Treatment
Avg. weight loss
05%10%15%20%25%
Availability
Injection
Weekly pen · GLP-1
Avg. weight loss
~20%up to
Availability Available now
Pill NEW
Daily tablet · Oral GLP-1
Avg. weight loss
~17%up to
Availability Explore now
Live Pricing

Our Range

Prices update live and may change. The live table below always takes precedence.
All treatment is subject to a prescriber consultation and clinical approval.

How to Apply Your FIRST40 Discount Code Today

Exclusive £40 Discount on Best Diet Pills

Transform your weight management journey with our exclusive FIRST40 discount code. This prescription-only offer gives you £40 off your first order of Mounjaro, the clinically-proven weight management injection that may help reduce appetite and support sustainable weight loss.

Your Savings with Code FIRST40

See how much you can save with our exclusive discount code:

• Mounjaro 2.5mg: Was £169.99 - Now £129.99 (Save £40)
• Mounjaro 5mg: Was £199.99 - Now £159.99 (Save £40)
• Intro Duo Bundle: Was £339.99 - Now £299.99 (Save £40)
• Progress Trio Bundle: Was £674.99 - Now £634.99 (Save £40)

How to Apply Your FIRST40 Code

Claiming your £40 discount is simple. Add your chosen Mounjaro prescription to your basket, proceed to checkout, and enter code FIRST40 in the discount field. Your £40 saving will be applied instantly before payment. This exclusive offer is available for new customers only and can be used on any Mounjaro product or bundle.

Why Choose Mounjaro for Weight Management

Mounjaro contains tirzepatide, which activates GIP and GLP-1 - two natural hormones that may help regulate appetite and promote feelings of fullness. This prescription-only medication is designed to support weight management alongside a reduced-calorie diet and increased physical activity. Our GPhC-registered pharmacy ensures you receive genuine, MHRA-approved medication.

Fast Clinical Assessment Process

Start your order today with our streamlined clinical assessment. Standard approval takes just 3 working days, or upgrade to express service for 24-hour approval. Our qualified prescribers will review your medical history and weight management goals to ensure Mounjaro is suitable for you.

Complete Your Discounted Order Now

Don't miss out on this exclusive £40 saving. Select your Mounjaro prescription, apply code FIRST40 at checkout, and start your weight management journey with Britain's trusted online pharmacy. Free discreet delivery included on all orders.

NEW

GLP-1, now in adaily pill

Meet the daily GLP-1 tablet — needle-free, taken on your schedule, and prescribed by UK pharmacists. Designed for flexibility.

Join the free waitlist
Track your progress

Your journey,in your pocket

Track Now

Meet the newGLP-1 pill

  • Once-daily tablet · room-temp storage
  • No needles, no fridge
  • Up to ~15–17% in trials
How treatment works

How GLP-1 treatments help

Reduces appetite

Helps you feel fuller, sooner — so portions naturally shrink.

Curbs cravings

Quietens food noise so snacking and cravings ease off.

Slows digestion

Food stays in your stomach longer, steadying hunger between meals.

Steady blood sugar

Supports more stable glucose levels through the day.

Is GLP-1 treatment right for you?

GLP-1 medicines are powerful and prescription-only for good reason. They suit many people very well — and they aren’t appropriate for everyone. Here’s a clear, honest picture before you decide.

You may be suitable

Criteria met
BMI of 30 or higher
BMI of 27+ with weight-related conditions
Struggled to lose weight with diet alone
Ready to pair with lifestyle changes

Speak to us first

Potential risk
Pregnant, trying to conceive, or breastfeeding
History of certain thyroid cancers
Certain pancreatic or digestive conditions
Under the age of 18

Ready to start your journey?

Check Eligibility
Track your progress

Your journey, in your pocket

Track your journey

Log every dose and watch your progress build.

Download now Free to download — takes a minute to set up. App Store and Google Play

AI Meal Tracking. Built for GLP-1 Appetites.

Point your camera at any meal and in 4–6 seconds it logs the calories, macros, weight, and fullness it expects.

Never miss a dose

A daily nudge keeps you on track.

Download now App Store and Google Play

How it works

Achieve your goals in just a few simple steps.

Step 1

Start Free Consultation

Select safe UK treatments. Quick answers.

Step 2

Review By Our Clinical Team

Our expert team will use your consultation as the basis of our recommendation and communicate with you.

Step 3

Get it delivered fast

We’ll deliver direct to you, as quickly as tomorrow.

Trusted by thousands

Real people, real change

Hannah M.
Lost 2 st 4 lb in a year

“The cravings that used to run my evenings just quietened down. Having a pharmacist to message made it feel safe.”

David O.
Lost 3 st in a year

“Discreet, simple and genuinely supportive. The dose steps were explained clearly every time.”

Priya S.
Lost 1 st 9 lb in a year

“I finally feel like food isn’t the loudest thing in my head. The delivery was always discreet and on time.”

Frequently asked questions