Mounjaro guides
Referenced information about Mounjaro (tirzepatide) for people in the UK: how it works, what the trials measured, side effects and warning signs, the licensed dose schedule, NHS access, and what happens when treatment stops. Written by a pharmacist and medically reviewed.
Mounjaro is a prescription-only medicine. These pages are general information about a licensed treatment, not a recommendation to use it and not a substitute for advice from a qualified healthcare professional. Only a prescriber can decide whether a treatment is suitable for you. For urgent symptoms call 999, or NHS 111 for urgent advice that is not an emergency.
How does Mounjaro work for weight loss? Tirzepatide explained
Tirzepatide acts on two gut-hormone receptors to change appetite and fullness. What that means in practice, what the trials measured, and why an average is not a forecast.
Read the guideMounjaro side effects: what is common, what is serious and when to get help
Which effects are common and usually settle, which need urgent assessment, and what current MHRA advice says about pregnancy, contraception and surgery.
Read the guideMounjaro dosage: starting dose, dose increases and missed injections
The licensed adult schedule, why increases are gradual, injection sites and rotation, and what the product information says about a missed dose.
Read the guideMounjaro vs Wegovy: how the weight-loss injections compare
A head-to-head trial gave tirzepatide the larger average loss. What that does and does not settle, and the questions worth asking at a consultation.
Read the guideCan you get Mounjaro on the NHS? Eligibility and UK use figures
Why a NICE recommendation is not the same as NHS access, how the phased rollout in England works, and what the survey estimates really measure.
Read the guideWhat happens when you stop Mounjaro? Weight regain and planning ahead
What the SURMOUNT-4 withdrawal trial actually measured, why appetite changes when treatment ends, and what to ask for in a follow-on plan.
Read the guideCan you drink alcohol while taking Mounjaro?
The NHS advises avoiding alcohol on tirzepatide. Why that is, and the extra glucose consideration for people treated for type 2 diabetes.
Read the guideCheck whether you qualify
Work out your BMI against the UK eligibility thresholds, or complete a free online assessment for a GPhC-registered prescriber to review.