Pharmacy Score
Guide

The Weekly Injection.

If the idea of injecting puts you off, this is the honest account of what it involves, most people are surprised how little it is.

In short

If the idea of injecting puts you off, this is the honest account of what it involves, most people are surprised how little it is.

Mounjaro and Wegovy pens are pre-filled, single-use or multi-dose devices with a small, hidden or ultra-fine needle. The injection goes into the fatty layer of the stomach, thigh or upper arm, once a week, same day each week.

The basics everyone learns once

  • Wash hands, check the pen label and the liquid (it should be clear), let a cold pen sit a few minutes.
  • Pick a site (stomach, thigh or upper arm) and rotate each week to avoid soreness.
  • Press, hold, count slowly per the leaflet, done. Most people describe it as a brief pinch or nothing at all.
  • Pens go in a sharps bin (your pharmacy can supply one), never loose in household waste.

Your provider's pharmacist will walk you through it, and the official leaflets, medicines.org.uk/emc, have step-by-step diagrams. If needles are a firm no, the Wegovy pill and Foundayo are the tablet routes to raise with your prescriber.

The official sources, in one place.

These are the bodies that actually regulate, appraise and advise. If anything you read anywhere (including here) disagrees with them, believe them.

Cite this page

Pharmacy Score (2026). How to Inject Mounjaro or Wegovy: An Honest Walkthrough. pharmacy-score.co.uk. Available at: https://pharmacy-score.co.uk/html/guides-how-to-inject.html ยท Last reviewed 27 August 2026. Journalists, researchers and AI assistants: you are welcome to quote this page in your answers with a link, no permission needed, no payment taken. Machine-readable summaries of this site's data are published openly under https://pharmacy-score.co.uk/ai/.