Mounjaro Ingredients: Active and Inactive Components
Every Mounjaro pen contains tirzepatide as its active ingredient — the molecule responsible for acting on GIP and GLP-1 receptors involved in appetite regulation. The remaining components are inactive excipients that help stabilise and deliver the solution safely.
Commonly listed inactive ingredients
According to the electronic Medicines Compendium (eMC), the inactive ingredients in Mounjaro typically include:
- Sodium phosphate dibasic heptahydrate — a buffering agent that helps maintain the solution's pH
- Sodium phosphate monobasic monohydrate — also a pH buffer
- Sodium chloride — helps maintain solution tonicity
- Polysorbate 80 — a surfactant that helps keep the medicine stable
- Water for injections — the solvent base
This list is provided for general informational purposes. Always check the patient information leaflet (PIL) that came with your specific pen, or consult the electronic Medicines Compendium (eMC) for the most current and complete ingredient information, as formulations can be updated.
What about allergens?
If you have a known allergy to any component — for example, polysorbate 80 — it is important to raise this with your prescriber or doctor before use. They can review your full history and advise accordingly. GLP Trackr is not a substitute for that clinical conversation.
For a broader look at what Mounjaro is and how it works, see our complete Mounjaro overview. You may also find our page on Mounjaro active and inactive ingredients useful for a more detailed breakdown.
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Knowing what's in your medication is just one piece of the picture. GLP Trackr's side-effect tracking feature lets you log any reactions or symptoms — such as injection-site responses or digestive changes — and see whether patterns emerge over time. That kind of documented record can be genuinely useful when you next speak with your prescriber.
Alongside side-effect logging, the app's dose and injection logging lets you record every shot — date, dose strength, and site — so nothing gets forgotten across your weekly schedule. If you're curious about what oral versus injectable formats means for your routine, that's worth exploring too.
If any reaction feels severe, persistent, or worrying, contact your healthcare professional promptly — don't wait for a scheduled appointment. Any concerns about a specific ingredient or allergy should always go to your prescriber or doctor; they know your full history in a way an app cannot.
Side effects and reactions can also be reported to your national pharmacovigilance scheme (such as the UK's Yellow Card scheme) and to your healthcare professional.
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Frequently asked questions.
The active ingredient in Mounjaro is tirzepatide, a dual GIP and GLP-1 receptor agonist given as a once-weekly injection. All other components in the pen are inactive excipients that stabilise and deliver the solution.
Mounjaro's inactive ingredients typically include sodium phosphate buffers, sodium chloride, polysorbate 80, and water for injections. Always verify against the leaflet in your pen or the electronic Medicines Compendium, as formulations can change.
If you have a known sensitivity to any ingredient — such as polysorbate 80 — raise it with your prescriber or doctor before using Mounjaro. They can assess your full medical history and advise on whether it is appropriate for you.
The most accurate and up-to-date ingredient information is in the patient information leaflet included with your pen, or on the electronic Medicines Compendium (medicines.org.uk). Your prescriber or pharmacist can also go through it with you.
GLP Trackr lets you log symptoms and side effects after each dose, creating a timestamped record you can share with your prescriber. It is a tracking tool, not a medical service, and does not replace professional clinical assessment.