Active and Inactive Ingredients in Mounjaro
Every Mounjaro pen contains one active ingredient and several excipients. Here is what the formulation generally includes, based on the product information published on the electronic Medicines Compendium (eMC):
Active ingredient
- Tirzepatide — the medicine itself, present at the dose strength of your pen (2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, or 15 mg per 0.5 ml dose). Tirzepatide acts on both GIP and GLP-1 receptors, which are involved in appetite regulation and blood-sugar control.
Inactive ingredients (excipients)
- Sodium phosphate dibasic heptahydrate and sodium phosphate monobasic monohydrate — buffering agents that help maintain the pH of the solution.
- Sodium chloride — helps make the solution suitable for injection into the body (isotonic).
- Polysorbate 80 — a surfactant used to stabilise the formulation.
- Water for injections — the solvent that carries all other ingredients.
Mounjaro does not contain latex, and the pen device itself is made up of standard medical-grade plastic and stainless-steel components. Always check the leaflet that came with your specific pen, as formulation details should be confirmed against the most current product information rather than recalled from memory.
If you have a known allergy to any of the listed ingredients, discuss this with your prescriber or doctor before using the medicine — they are best placed to advise on suitability for you specifically.
For a deeper look at what goes into each pen, see our guides on Mounjaro's full ingredient breakdown and what's in each Mounjaro pen. You may also find it useful to read about air bubbles in the Mounjaro pen if you have noticed small bubbles before injecting.
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GLP Trackr is a companion app for people already on Mounjaro or Wegovy — it does not sell, supply, or provide medical advice. Any questions about whether Mounjaro's ingredients are suitable for you should go to your prescriber or doctor, not an app.
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Frequently asked questions.
The active ingredient in Mounjaro is tirzepatide, a dual GIP and GLP-1 receptor agonist. It is present in each pre-filled pen at dose strengths ranging from 2.5 mg to 15 mg per 0.5 ml dose, as prescribed by your doctor.
Mounjaro does not contain latex, but it does include excipients such as polysorbate 80 and sodium phosphate salts. If you have a known allergy to any ingredient, speak with your prescriber or doctor before using it — they are best placed to assess suitability for you.
Mounjaro's excipients typically include sodium phosphate dibasic heptahydrate, sodium phosphate monobasic monohydrate, sodium chloride, polysorbate 80, and water for injections. Always confirm against the leaflet in your pen or the electronic Medicines Compendium for the most current information.
The full ingredient list is printed in the patient information leaflet inside your pen packaging. You can also find it on the electronic Medicines Compendium (medicines.org.uk) by searching for Mounjaro. Your prescriber or pharmacist can also walk you through it.
GLP Trackr lets you log each Mounjaro injection — dose strength, date, and time — and record side effects after each dose. This gives you a dated record to discuss with your prescriber if you have concerns about a particular ingredient or reaction.