Mounjaro Dosage: The Complete UK Dose Schedule Explained

Every dose from 2.5mg to 15mg — how the titration schedule works, what to do about missed doses, and why most people never need the maximum.

Part of the Overweight and Obesity Guide.

One of the first things people notice about Mounjaro is that the dose you start on is not the dose you stay on. The medicine is designed to be stepped up gradually, and understanding that schedule — why it exists, how long each stage lasts, and when to stop climbing — makes the whole treatment far less confusing.

This guide covers the practical side of Mounjaro dosing in the UK. If you're still weighing up the treatment itself, start with what is Mounjaro? or dig into the science in how does Mounjaro work?

How Mounjaro dosing works

Mounjaro (tirzepatide) is a once-weekly injection, taken on the same day each week, with or without food, at any time of day. It comes in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg — each supplied as its own pre-filled KwikPen.

Nobody starts at the top. Everyone begins on 2.5mg, and the dose rises in 2.5mg steps, with a minimum of 4 weeks on each dose before any increase. There's a good reason for the slow climb: Mounjaro's most common side effects — nausea, and other digestive symptoms — are strongly linked to how quickly the dose rises. Titrating slowly gives your gut time to adapt at every stage.

The full Mounjaro dose schedule

Here's the standard titration pathway for weight management, assuming each dose is tolerated and an increase is clinically appropriate. Your prescriber may hold any step for longer — the weeks shown are minimums, not a race.

Finding your maintenance dose

A common misunderstanding is that everyone is meant to end up on 15mg. They aren't. For weight management, the recommended maintenance doses are 5mg, 10mg and 15mg — the 7.5mg and 12.5mg strengths are stepping stones between them.

Higher doses did produce more weight loss on average in the SURMOUNT-1 trial, so there's a real dose-response relationship. But averages aren't individuals: plenty of people lose steadily at 5mg or 10mg with fewer side effects than they'd have higher up. The right maintenance dose is the lowest one that keeps your weight moving in the right direction with side effects you barely notice.

It's also normal for progress to come in waves. A slower month doesn't automatically mean you need a higher dose — sleep, food choices and activity all play a part, which is where our weight management tips for busy adults and our guide to what to eat on Mounjaro earn their keep.

Missed doses and changing your injection day

Life happens — holidays, night shifts, a pen left in the wrong fridge. The rules here are simple:

Managing dose increases

Most side effects cluster around two moments: your very first injections, and the days after each dose increase. That's expected — your body is adjusting to a higher level of tirzepatide — and for most people the symptoms fade within days.

If a new dose is hitting you harder than expected, tell your prescriber rather than pushing through. The schedule has built-in flexibility: you can stay longer at your current dose, or step back down and try again later. Nothing about the licence forces you upwards on a timetable.

For what those symptoms look like and how to take the edge off them — from food choices to hydration — our dedicated guide to Mounjaro side effects covers it in full. And if Mounjaro doesn't suit you, there are alternatives: see Mounjaro vs Saxenda and our UK guide to prescription weight loss medication.

The bottom line

Mounjaro dosing is a ladder, not a lift: start at 2.5mg, climb in 2.5mg steps with at least 4 weeks on each rung, and stop climbing at whichever maintenance dose — 5mg, 10mg or 15mg — gives you steady results you can tolerate. Miss a dose? Take it within 4 days or skip it. And never, ever double up.

Your prescriber sets the pace with you. At Access Doctor, every dose change is reviewed by a prescriber, so you're never guessing your way up the schedule alone.

Every Mounjaro dose strength is available from Access Doctor following an online consultation reviewed by a prescriber, dispensed from our GPhC-registered pharmacy in temperature-controlled packaging.