Compare Side Effects - Get £40 OFF with FIRST40

  • £40 OFF first order with discount code FIRST40
  • Compare side effects between tirzepatide and semaglutide treatments
  • GPhC-registered pharmacy with clinical assessment included
  • Express 24-hour approval available for urgent orders
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Treatment from £144.99

Takes under 2 minutes · 100% online
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Height 175 cm
Weight 82 kg
Your BMI
26.8
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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.

Side Effects Comparison: Save £40 on Your Choice

How to Apply Your £40 Discount Code

Use code FIRST40 at checkout to save £40 on your first Mounjaro order. Your 2.5mg starter pen drops from £169.99 to £129.99, whilst the 5mg pen reduces from £199.99 to £159.99. The discount applies automatically when you enter FIRST40 during payment. Returning customers receive £25 off every subsequent order.

Tirzepatide Side Effects Profile

Mounjaro (tirzepatide) may cause gastrointestinal side effects in some patients. Common side effects can include nausea, vomiting, diarrhoea, and decreased appetite. These effects are typically mild to moderate and may reduce as your body adjusts to treatment. The dual-action mechanism targeting both GIP and GLP-1 receptors may result in different tolerance patterns compared to semaglutide.

Semaglutide Side Effects Overview

Semaglutide treatments commonly report similar gastrointestinal effects, including nausea, vomiting, and diarrhoea. However, the frequency and intensity may vary between individuals. As a single GLP-1 receptor agonist, semaglutide's side effect profile has been extensively documented through clinical trials and real-world usage.

Key Differences in Side Effect Patterns

Clinical studies suggest tirzepatide may have a slightly different tolerability profile due to its dual-hormone approach. Some patients report fewer gastrointestinal side effects with tirzepatide, whilst others find semaglutide more suitable. Both medications require gradual dose escalation to minimise side effects and improve tolerability.

Your Savings Breakdown with FIRST40

Single pen savings: 2.5mg £129.99 (save £40), 5mg £159.99 (save £40), 7.5mg £209.99 (save £40). Bundle savings: Intro Duo £299.99 (save £40), Progress Duo £369.99 (save £40). All prices include clinical assessment and prescription services from our GPhC-registered pharmacy.

Clinical Assessment Process

Complete your online consultation to receive prescription-only Mounjaro with your discount applied. Our clinical team reviews applications within 3 working days, or choose express 24-hour processing. Both tirzepatide and semaglutide require clinical assessment to ensure suitability and discuss potential side effects based on your medical history.

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.

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Your journey,in your pocket

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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

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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?

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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