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How Monj Works

Monj is an independent UK price comparison index for prescription weight-loss medicines, starting with Mounjaro (tirzepatide). It shows what GPhC-registered pharmacies actually charge at checkout, side by side, so you can see the real cost before you choose where to have a consultation. It is operated by Medstack Ltd and is not a pharmacy.

  • Written by Nick Johnson, founder of Monj
  • Last reviewed 25 August 2026
  • Independent, no advertising, no sign-up

What Monj does

  • Lists verified UK pharmacies and the total price you pay for each dose, including delivery and consumables where they are charged.
  • Shows discount, retail and subscription prices separately, so a first-order offer is never mistaken for an ongoing price.
  • Orders price lists by lowest total patient price, with a published rule that commission cannot change.
  • Explains pharmacy policies that affect you after you sign up, such as maintenance BMI limits and subscription terms.
  • Lets you see every price without an account, a form or an email address.

What Monj does not do

  • Sell, prescribe, supply or dispense any medicine.
  • Give medical advice, or tell you whether a treatment is right for you.
  • Route you to a chosen pharmacy, run a matching service, or ask for your details before showing prices.
  • Accept payment for a listing, a position, a badge or a description.
  • Show advertising or run a mailing list.

How to use Monj in three steps

  1. Find your dose. Open the discount price list or the retail price list and read across the row for the dose you have been prescribed or expect to start on. The price shown is the total at checkout with the offer applied.
  2. Check the pharmacy. Every listed pharmacy has passed Monj’s verification checks, and the GPhC number in the table links to the official register so you can confirm it yourself. Our GPhC verification guide shows how.
  3. Read the policy before you pay. Ask about maintenance BMI limits, time limits and subscription terms up front. Our guides to maintenance pharmacies and subscription pricing list the questions to ask.

How we work, in detail

Each of these pages is the single home for one part of how Monj operates.

Safety before price

A lower price only matters if the pharmacy is legitimate and the clinical pathway is right for you. Check its pharmacy score before you buy, confirm the pharmacy on the GPhC register, expect a consultation that independently verifies your weight and height rather than a questionnaire alone, and report any suspected side effect through the MHRA Yellow Card scheme. Speak to a prescriber or pharmacist about your own treatment.

Beyond prices

Medstack Ltd pledges at least 20% of yearly profits to charity through the charity pledge, and funds Augo, a completely free GLP-1 companion app, from the same commission that funds this site. People using these medicines can share experiences of providers and pricing in the Monjour community, which Medstack supports. Questions, corrections and verification requests go through the contact page.

Sources referenced on this page

Monj is an independent price comparison index operated by Medstack Ltd. We are not a pharmacy and we do not sell, prescribe, supply or dispense medicines. Listings are ranked strictly by the lowest total patient price, with alphabetical order used to break ties. No pharmacy can pay for placement, ranking or badges. Some outbound links earn a referral commission, and this never affects position or inclusion. Read the full independence statement.