Mounjaro guides
Clear, practical guides on getting the most from your Mounjaro treatment. Educational only — always follow your prescriber.
How long does a Mounjaro pen last?
Four full doses, 240 clicks — but partial dosing can make a pen last much longer.
Read guideManaging Mounjaro side effects while titrating
Why going up slowly helps — and how smaller click-counted steps can ease the transition.
Read guideMounjaro every 5 days vs once a week
Shorter intervals smooth the peaks — here's the trade-off, modelled.
Read guideWhat to do if you miss a Mounjaro dose
Within 4 days, take it as soon as you remember. After that, skip it — never double up.
Read guideMounjaro injection sites: where and how to inject
Abdomen, thigh or upper arm — rotate each week, any time of day, with or without food.
Read guideMounjaro and contraception: what to know
The pill may work less well on Mounjaro — the MHRA advises a barrier or non-oral method. Here's why.
Read guideMounjaro eligibility: NHS vs private criteria
The NHS uses a higher BMI threshold (35+) than the licensed/private route (30+). Here's why.
Read guideHow long do Mounjaro side effects last?
Most are gut-related, peak after starting or a dose increase, and ease over days to weeks.
Read guideMounjaro vs Wegovy vs Ozempic: how they differ
Two different drugs, and only some are licensed for weight loss. Here's the plain-English breakdown.
Read guideWhat to expect in your first month on Mounjaro
Month one is a 'getting-used-to-it' phase — a low starter dose, settling side effects and early appetite changes.
Read guideMounjaro dosing questions: switching, going up early, and plateaus
Switching, stepping up early and plateaus — the common dosing questions, answered from the official guidance.
Read guideHow much does Mounjaro cost in the UK?
NHS vs private, the 2025 list-price rise, and why two pharmacies quote very different numbers.
Read guideEducational tool — not medical advice. This calculator is for general information only. Mounjaro (tirzepatide) is a prescription-only medicine. Always follow the dosing instructions given by your prescriber and the patient information leaflet, and never change your dose or use click-counting without professional guidance.