Do you keep losing weight on the maintenance dose of Mounjaro?

The decision you're really facing: is my maintenance dose working, or should something change?

Most people ask this question at a point of uncertainty. The scale has slowed, the early dramatic drops have levelled off, and there's a genuine question about whether that's progress or stagnation. The honest answer is that both interpretations can be correct depending on context, and choosing the right response (staying the course, reviewing lifestyle, or discussing a dose adjustment with your prescriber) matters more than the question itself.

Mounjaro's titration schedule exists for a reason: the 2.5mg starting dose is there to let your body adjust, not to produce weight loss. As the prescriber-set maintenance dose is reached and stabilised, the medicine is doing the work it's licensed for. That work doesn't stop the moment a dose is held steady. SURMOUNT-1 data, published in the New England Journal of Medicine, showed participants continued losing weight across the full 72-week trial, with the greatest cumulative losses seen in those on the highest doses. The trajectory didn't flatten to zero at the point maintenance was reached.

So the first factor in your decision is realistic expectation: slower loss at maintenance is not a sign the treatment isn't working. A plateau, by contrast, may be worth discussing with a prescriber. The distinction matters, and it's one a clinician is better placed to assess than a forum post.

How the dose you're maintained on shapes what you can expect

Not everyone reaches the same maintenance dose, and that gap in dose matters more than most people realise. Someone maintained at 5mg and someone maintained at 15mg are on meaningfully different treatment intensities. In SURMOUNT-1, average weight reduction at 5mg was around 16% over 72 weeks; at 15mg it was around 20–21%. Those are averages across thousands of trial participants (your individual result will vary) but they illustrate that the dose your prescriber settles you on is a genuine driver of outcomes.

The maximum licensed dose of Mounjaro is 15mg. If side effects at a particular dose have led your prescriber to hold you at a lower level, that's a clinical trade-off: tolerability versus potential weight loss, assessed for your specific health picture. Pushing through side effects without clinical guidance isn't sensible. A prescriber can weigh whether a slower titration, a temporary hold, or a different strategy suits you better.

It's also worth knowing that the 2.5mg dose is not typically a maintenance dose for weight loss, it's a tolerability ramp at the start of treatment. If you're still at 2.5mg after several weeks, that's worth a conversation with your prescriber about next steps rather than a conclusion that the treatment isn't doing anything.

What a plateau actually means, and when to bring it up

A weight plateau on Mounjaro is clinically normal. Your body's energy regulation adapts as weight falls: metabolic rate adjusts, appetite signals shift, and the gap between energy in and energy out narrows. This happens on any effective weight-loss treatment, not just GLP-1 medicines. Reaching a plateau doesn't mean the dose has stopped working; it may mean your body has found a new equilibrium at a lower weight, which is itself a meaningful outcome.

NICE's guidance on tirzepatide (TA1026) does include a clinical review point: if less than 5% weight loss has occurred after six months at the highest tolerated dose, continuing treatment should be assessed by the prescriber. That's a clinical threshold to guide decisions, not a self-assessment benchmark. The 5% figure applies to a specific scenario; it isn't a target or a minimum expectation for shorter timeframes.

If you've been on your maintenance dose for a while and weight has plateaued, the practical questions are: has anything changed in diet, activity or stress? Are you still taking the injection correctly each week? Have you spoken to your prescriber about it? Those are the levers available, and your prescriber is the right person to help you work through them, not least because some plateaus resolve without any change to the dose at all. Many of our prescribers find people feel a lot better simply knowing a plateau is expected, not a failure.

Thinking about how long maintenance continues, and what that means for cost

One question we hear often is how long maintenance actually lasts. There's no fixed endpoint for everyone: how long you stay on a maintenance dose depends on your goals, your health picture and the ongoing clinical review at each repeat order. Weight management with tirzepatide is generally considered a longer-term commitment rather than a short course, which is worth factoring into practical planning.

If you're weighing up the cost of staying on treatment, our Mounjaro price comparison page sets out the UK market context honestly, including what's typically included (or not) in headline prices elsewhere. At nume, every repeat order goes through the same clinical review as the first; there's no subscription that rolls on without anyone checking in.

If you'd like to discuss where you are in your treatment (whether you're considering starting, or already on a maintenance dose and wondering what to expect next) you can start your free consultation and a prescriber will review your situation the same day.