Can You Stay on 5mg Mounjaro and Still Lose Weight? (October 2026)

01 · The core answer

Yes: 5mg is a real treatment dose, and many people stay on it

You can stay on 5mg Mounjaro and keep losing weight if the dose controls your appetite and you tolerate it well. The dose ladder itself says so: everyone starts on 2.5mg, and the starting dose is about letting your body adjust rather than weight loss itself. After that, many people settle at a maintenance dose of 5mg, 10mg or 15mg, and higher is not automatically better.¹

This is the point many people miss. 5mg is not a warm-up for the "real" doses. It is the first dose at which most measurable progress builds, and for some people it is all they need. The decision is not "how fast can I climb the ladder?" but "is my current dose still doing its job?"

02 · Your decision

Should you stay on 5mg or step up?

Stay on 5mg while your weight is trending down, your appetite is manageable and side effects are tolerable; consider a conversation about stepping up when progress has stalled for a sustained period despite good habits.

If you are on 5mg and wondering about the next rung, our guide to how much weight you can lose on 5mg goes further into expectations. If you are earlier in treatment, the 2.5mg starting dose works differently.

Ready to start or continue treatment? Our Mounjaro pen page shows current doses and a free online consultation, reviewed by a GPhC-registered prescriber. A 5mg pen costs £218.99, and every later order is £25 off the standard price.

Related guide: Can i stay on 5mg mounjaro for weight loss.

03 · What 5mg achieved in trials

What 5mg achieved in the trials

In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg over 72 weeks, compared with 3.1% with lifestyle changes alone.²

Those are trial averages, and individual results vary. They also come from people using the medicine alongside a reduced-calorie diet and increased physical activity, not instead of them. The numbers do not mean you will match the average, and they are not a promise.

The same trial reports how many people reached a meaningful loss at each dose. 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 In plain terms, most people on 5mg lost a clinically meaningful amount. Higher doses added to that, and the biggest losses, the ones reaching a fifth of body weight, were reported on the two higher doses.

So the fair reading is this: 5mg delivers a large part of the benefit for many people, while higher doses tend to deliver more on average. Whether the extra is worth it for you depends on your goals, your side effects and how you respond.

04 · Realistic pace on 5mg

Realistic pace: think in months

Weight loss on Mounjaro is gradual by design, and most measurable progress builds from 5mg onward, month by month. The first weeks on 2.5mg are an adjustment phase, and losses there are usually modest. Trials measured results at 72 weeks, so think in months, not days, and judge progress by trend, not individual weigh-ins.²

If you have only just stepped up to 5mg, it is far too early to decide it is not working. Dose changes take time to show in the trend, and a quiet fortnight proves very little.

Three months in, most people are still on the lower rungs of the dose ladder, so trial-average losses at this stage are modest compared with the headline figures. In SURMOUNT-1, average weight loss built month by month, with the full averages measured at 72 weeks, not at the three-month mark. A sensible three-month expectation on a standard titration is mid single digits as a percentage of body weight, with wide individual variation. Slower early progress does not predict failure, because the dose you respond to may still be ahead of you.²

Early weeks are also noisy. Some people notice appetite change and early loss in the first week, while others feel little until a higher dose, and 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.

The formal review point

Treatment response is reviewed by your prescriber: 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 If 5mg is where you tolerate treatment best, that review is judged from there.

05 · What to do at a plateau

What to do if you stall on 5mg

A stall on 5mg is common and is not automatically a sign that the dose has failed. Weight loss on Mounjaro is not linear: plateaus of a few weeks are normal and expected as the body adapts to a lower weight.

Within the licence, the sensible responses are, in order:

• Review food intake honestly. Portions drift back up, especially as appetite settles and you feel more comfortable eating.
• Protect protein and activity. Medicine works alongside a reduced-calorie diet and increased physical activity, not instead of them.
• Check the basics. Sleep and alcohol both affect appetite and weight.
• Talk to your prescriber about a step-up. If you are not yet at the maximum, they can discuss whether the next dose is appropriate for you.

A plateau is not a reason to double doses or add unlicensed products. The ladder offers a safe, licensed route if you need more.

Tracking helps you see the difference between a plateau and a real stall. Our free companion app, GLPTrackr, lets you log your journey on iOS or Android, so you can judge the trend rather than react to one reading.

06 · 2.5mg, 5mg and 7.5mg compared

2.5mg, 5mg and 7.5mg: what changes between doses

The step from 2.5mg to 5mg is the one that matters most for weight loss, because 2.5mg is a starting dose. Everyone starts Mounjaro on 2.5mg once a week, and this starting dose is about letting your body adjust, not about weight loss itself.¹

After at least 4 weeks the dose increases to 5mg, and can then step up by 2.5mg at a minimum of 4-week intervals (7.5mg, 10mg, 12.5mg) up to a maximum of 15mg weekly, depending on how you respond and tolerate it.¹ That is a minimum, not a target. Your prescriber guides the pace.

That is why each step is gradual, and why many people do well without climbing the whole ladder.

Do bear in mind that the benefits of 5mg are not only about the scales. 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. These are trial-average secondary outcomes, not promises.²

07 · Side effects and staying put

If side effects are the reason you want to stay on 5mg

You do not need to push on simply because the minimum interval has passed; if a new dose is hard to tolerate, prescribers can hold the current dose longer before stepping up.

What you should not do is improvise. Altering doses outside the licence means unknown dosing accuracy and no safety data.

Mounjaro is a once-weekly injection, given on the same day each week at any time of day, with or without food. Stretching it to a longer interval is unlicensed and not an approved route. If you want to change your injection day, you can do so as long as there are at least 3 days between two doses.

Serious side effects are uncommon but need urgent attention: for severe, persistent stomach pain that may spread to your back, pain in the upper right abdomen with fever or yellowing of skin or eyes, or signs of a severe allergic reaction, seek immediate medical help. For the full list of side effects, read the patient information leaflet supplied with your pen.¹³ If you notice a new symptom, speak to your prescriber and consider reporting it through the Yellow Card scheme.¹⁹

08 · Keeping going and keeping weight off

Staying on 5mg, coming off it, and what happens to the weight

Mounjaro works alongside habits, so what you build on 5mg is what you carry forward. Treatment is used alongside a reduced-calorie diet and increased physical activity. The routines you practise while appetite is quieter, such as regular protein, sensible portions and steady movement, are the part you keep if treatment ever changes.

If you stop altogether, the medicine does not vanish at once. Tirzepatide has a long half-life, so after a final dose it takes roughly four to five weeks to clear the system. There is no way to speed this up, and nothing needs doing while it clears.¹ Planning ahead with your prescriber is wise instead of stopping abruptly.

Your prescriber can discuss whether to stay on your current dose, adjust it or stop, based on your goals and progress. Our aftercare includes ongoing monthly reviews, dose-titration and follow-up assessments by the prescribing team, plus side-effect support.

In SURMOUNT-4, people who stopped tirzepatide after 36 weeks regained on average 14% of body weight over the following year, while those who continued treatment lost a further 5.5% on average.

09 · Serious side effects

Serious side effects: when to get help straight away

Serious side effects are uncommon but need urgent attention. Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹

10 · Getting 5mg through us

Getting 5mg, privately or on the NHS

You can get Mounjaro through the NHS or privately, and the NHS route is being phased in over several years. Mounjaro is available on the NHS, but access is being phased in. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the NHS primary-care rollout began in June 2025 with the highest-need groups first (initially BMI 40+ with four or more qualifying conditions).⁴ Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment rather than waiting.⁵

With EverydayMeds, ordering follows a short path:

• Free online consultation. A short health questionnaire, no charge and no obligation.
• Prescriber review. Reviewed by a GPhC-registered prescriber (GPhC 9012878), and unsuitable orders are refunded automatically.
• Dispatch and delivery. Same-day dispatch when ordered by 3pm, then free next-day tracked delivery in temperature-controlled packaging.

All six doses are in stock, supplied through official LillyDirect supply. A 5mg pen costs £218.99. New customers save £40 on their first order with code FIRST40, and an automatic £25 reorder discount applies to every future order (code DOSE25). Repeat orders re-check suitability, with no auto-shipping and no subscriptions. See our weight loss clinic for the wider service.

If you are weighing up eating habits alongside treatment, our guide on eating normally on Mounjaro covers it, and our page on staying on 5mg for a couple of months looks at shorter stretches.

Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. It is used alongside a reduced-calorie diet and increased physical activity. Individual results vary. This page is information, not a substitute for medical advice.