Mounjaro Dosage Chart: Full UK Dose Escalation Guide
Mounjaro (tirzepatide) is available in six doses, ranging from 2.5 mg to 15 mg, all administered as a once-weekly subcutaneous injection. All patients begin at the 2.5 mg starting dose regardless of body weight, and doses are increased gradually every four weeks under clinical supervision. No patient should increase their own dose without instruction from their prescribing clinician.
Mounjaro Dosage Chart: UK Escalation Schedule
| Phase | Dose | Duration | Purpose |
|---|---|---|---|
| Starting dose | 2.5 mg | Minimum 4 weeks | Introduces the medication at a low level to minimise gastrointestinal side effects |
| Dose increase 1 | 5 mg | Minimum 4 weeks | First therapeutic increase; appetite suppression becomes more consistent at this level |
| Dose increase 2 | 7.5 mg | Minimum 4 weeks | Mid-range dose associated with meaningful weight loss in most patients |
| Dose increase 3 | 10 mg | Minimum 4 weeks | Higher therapeutic dose; many patients achieve target weight loss at this level or below |
| Dose increase 4 | 12.5 mg | Minimum 4 weeks | Prescribed where additional weight loss benefit is needed, and lower doses are well tolerated |
| Maximum dose | 15 mg | Ongoing as clinically directed | The maximum licensed dose is associated with the greatest average weight loss outcomes in trial data |
The above schedule reflects the standard escalation pathway. Your clinician may recommend remaining at a given dose for longer than four weeks based on your individual response and tolerability. Not all patients will need to reach the maximum dose.
How the Dose Escalation Process Works in Practice
The structured escalation schedule exists for patient safety. Increasing the dose too quickly significantly increases the risk and severity of gastrointestinal side effects such as nausea and vomiting. By allowing a minimum of four weeks at each level, the body has time to adapt before the dose is raised further.
At each follow-up appointment as part of our Mounjaro weight loss programme in Chelmsford, your clinician will assess how well you are tolerating your current dose and whether progress warrants an increase. Dose decisions are never automatic and always take into account your individual clinical picture.
What Each Dose Level Means for Weight Loss
These doses are primarily about tolerance rather than the maximum weight loss effect. Patients typically notice reduced appetite and early changes in food preferences at these levels, but the most substantial weight loss generally occurs as the dose increases further.
These are the doses at which the majority of patients experience their most consistent and noticeable weight loss. Clinical trial data show meaningful body weight reduction at these levels, and a significant proportion of patients achieve their clinical targets without needing to escalate further.
Prescribed where additional benefit is needed, and the lower doses are well tolerated. The SURMOUNT-1 trial showed the greatest average weight loss outcomes at 15 mg, but not all patients require or will be clinically appropriate for these levels. Your clinician will guide this decision.
Can the Dose Be Reduced or Paused?
Yes. Dose flexibility is an important part of safe Mounjaro prescribing. If side effects at a given dose are persistent or significantly affecting quality of life, your clinician may recommend:
- → Remaining at the current dose for an extended period before attempting an increase
- → Reducing back to the previous dose temporarily until symptoms settle
- → Pausing treatment for a short period in exceptional circumstances
Any change to your dose must be made in consultation with your prescribing clinician. Self-managing dose changes outside of clinical guidance carries risks including reintroducing side effects or reducing treatment efficacy.
Mounjaro Dosing: What the NHS and Regulators Say
The dose escalation schedule described above is consistent with the Summary of Product Characteristics (SmPC) approved by the MHRA for Mounjaro in the UK. The NHS information page for tirzepatide also provides details on how the medication is used and what patients can expect throughout treatment.
Frequently Asked Questions: Mounjaro Dosage
What dose of Mounjaro should I start on?
All patients, regardless of body weight or previous weight loss medication experience, must begin Mounjaro at the 2.5 mg starting dose. This is a clinical requirement, not an optional step. The starting dose is lower than the therapeutic target specifically to allow the body to adjust and minimise early side effects.
How often do I increase my Mounjaro dose?
Dose increases typically happen every four weeks, provided the current dose is well tolerated, and your clinician agrees an increase is appropriate. Some patients remain at a given dose for longer if they are still experiencing side effects or if their progress at the current level is sufficient. Your clinician makes this decision at each follow-up review.
What is the maximum dose of Mounjaro in the UK?
The maximum licensed dose of Mounjaro in the UK is 15 mg, administered once weekly. This is only reached after progressing through all lower dose levels and is only prescribed where clinically appropriate and well tolerated. Not all patients need to reach the maximum dose to achieve their weight loss goals.
Can I skip a dose of Mounjaro?
If you miss a dose and it has been fewer than four days since your scheduled injection day, take the missed dose as soon as possible and then return to your normal weekly schedule. If it has been more than four days, skip the missed dose and resume your regular schedule the following week. Do not take two doses in the same week. Contact your clinician if you are unsure.
What happens if I take too much Mounjaro?
Taking more than your prescribed dose increases the risk of gastrointestinal side effects, including severe nausea and vomiting. If you believe you have administered too much, contact your clinician or call 111 for advice. Store your medication securely and never adjust your dose outside of clinical guidance.
⚠ Important Disclaimer
This blog is intended as a general guide only and does not constitute personalised medical advice. Individual responses to Mounjaro can vary, and this information should not replace a consultation with a qualified healthcare professional. If you have specific concerns about side effects or your suitability for treatment, please get in touch with our team or speak to your GP.