Mounjaro 5mg Weight Loss Results (October 2026)

01 · Results

What weight loss should you expect on 5mg?

Expect gradual loss that accumulates over months, with the trial average as a long-term reference rather than a target. At 72 weeks, 85% of participants on 5mg, 89% on 10mg and 91% on 15mg had lost at least 5% of their body weight.²

These are trial averages. Individual results vary, and treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.² For a wider view, see our overview of Mounjaro weight loss results, or our guide to what 5mg looks like in practice.

There is no reliable loss per week on 5mg. The trial reported averages over 72 weeks, not a steady weekly figure. Judge progress by the trend across several weigh-ins.

02 · Decision

Is 5mg enough, or should you step up?

5mg can be enough, and your prescriber decides with you. Many people settle at a maintenance dose of 5mg, 10mg or 15mg — higher is not automatically better, and your prescriber will guide the right pace.¹

If progress is slow, ask about a step-up rather than adjusting doses yourself. The licensed ladder rises only after at least 4 weeks on a dose. Our 5mg treatment page covers ordering in detail.

03 · Pace and early weeks

Pace of results in the early weeks

Weight loss on Mounjaro is gradual by design. The first weeks on 2.5mg are an adjustment phase and losses are usually modest; most measurable progress builds from 5mg onward, month by month.¹

Some people notice appetite change and early loss in week one, others feel little until a higher dose. Both are normal. Early loss includes water weight, so the trend over weeks matters more than any single weigh-in. Mild nausea, altered appetite and tiredness in the first days after each injection are the commonest early effects and usually settle.

Early on, average losses are modest compared with the headline figures. In the main trial, average weight loss built month by month, with the full averages measured at 72 weeks. Slower early progress does not predict failure. Our pages on the first week and results after a couple of months give more context.

04 · Plateaus and speeding up

Plateaus and how to get more from 5mg

Weight loss on Mounjaro is not linear, and plateaus of a few weeks are normal as the body adapts to a lower weight. Within the licence, the responses are practical.

• Review food intake honestly, as portions drift back up.
• Protect protein and activity.
• Check the basics, such as sleep and alcohol.
• Discuss with your prescriber whether a dose step-up is appropriate if you are not yet at maximum.

A plateau is not a reason to double doses or add unlicensed products.

Your prescriber will also review your response. If you have lost less than 5% of your starting weight after 6 months on the highest dose you can tolerate, your prescriber will discuss whether continuing or stopping is right for you.¹

05 · Beyond the scales

Health changes beyond the scales

Weight is only one outcome. In trials, weight loss on tirzepatide came with average improvements in waist size, blood pressure, cholesterol and blood-sugar measures, and most participants with prediabetes returned to normal blood-sugar levels.²

These are trial-average secondary outcomes, not promises. They explain why prescribers talk about weight management as health management rather than appearance. For other routes, compare weight loss injection results or see our weight loss clinic.

Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. Individual results vary. This page is information, not a substitute for medical advice.