Mounjaro BMI Cut Offs: Why Pharmacies Stop Prescribing and How to Plan Around It

What people are reporting

The pattern is consistent. Someone loses weight steadily for a year, goes to reorder as normal, and the pharmacy declines because their updated BMI has crossed an internal threshold, often somewhere between about 22 and 25. No taper, no maintenance plan, sometimes not even a conversation, just a refusal at checkout. For a person mid treatment, that can mean a sudden return of appetite with no plan for what comes next.

To be clear about both sides: a pharmacy refusing to prescribe below its floor is not doing anything wrong in itself. The problem Monj keeps hearing about is transparency, cut offs that nobody mentioned at sign up, applied without warning at the moment of reorder.

Why cut offs exist at all

Mounjaro’s licence describes who can start: adults with a BMI of 30 or more, or 27 or more with at least one weight-related condition. It says nothing about a BMI at which everyone must stop, so continuing at a lower BMI is a clinical judgement for the prescriber, who must be satisfied the medicine is still appropriate and safe for you.

That judgement now has teeth. Guidance from the General Pharmaceutical Council, updated in February 2025, requires online prescribers to independently verify your weight, height or BMI before supplying weight loss medicines, rather than relying on a self-completed questionnaire. That is a genuinely good rule, it exists to stop unsafe supply to people who should never have qualified, and it is why your BMI is checked properly at reorder rather than waved through.

The flip side is that no prescriber can responsibly keep supplying an appetite suppressant to someone heading towards underweight. Somewhere between a healthy BMI and an unsafe one, every provider has to draw a line. The licence does not draw it for them, so each company draws its own, and that is exactly why the lines vary so much.

Every provider draws the line differently

Some pharmacies stop issuing the moment BMI reaches the healthy range. Others run structured maintenance programmes down to a stated floor, with spaced-out doses or the lowest pen strength. A few publish their maintenance policy clearly; many do not publish one at all, and you only discover the line by hitting it.

Because this is one of the most common questions Monj gets, our maintenance friendly pharmacies directory lists providers by their stated maintenance BMI, ordered from the lowest floor upwards, with the ordering rule printed above the grid. The maintenance price list covers what those providers charge.

One distinction worth keeping straight: the BMI needed to start is a different question from the BMI at which a provider stops. For starting criteria, see the BMI requirements guide.

Why an abrupt stop is the worst version

The evidence on stopping is blunt. In SURMOUNT-4, participants who stopped tirzepatide after 36 weeks regained on average about 14% of their body weight over the following year, while those who continued kept losing. Appetite returns when the medicine leaves your system, and if that happens on a random Tuesday because a reorder bounced, none of the habits, support or tapering that make maintenance work are in place.

That is the real case against undisclosed cut offs. It is not that a floor exists, it is that a floor you discover by surprise converts a planned landing into a cliff edge. If you and your prescriber decide to stop or step down, that should happen as a plan, with the last months used deliberately to build the habits that take over.

How to avoid being caught out

• Ask before you commit. One question for any provider: what is your maintenance policy, and at what BMI do you stop prescribing? Get the answer in writing, even a chat transcript. If they cannot answer it, that is your answer.
• Track your own BMI. The free BMI calculator takes seconds. Know how far you are from your provider’s line before your provider tells you.
• Raise maintenance early. When you are within a few BMI points of the healthy range, ask your prescriber what the plan is: continue, space doses, step down a strength, or stop with support. Do not let the reorder screen make the decision.
• Switch on your terms if you need to. If your provider’s floor does not fit your plan, moving is straightforward and does not need a treatment summary. The switching pharmacy guide covers the evidence to have ready, and the golden rule: start the switch with a dose in hand.
• Never bridge a gap with grey market pens. Being cut off is frustrating; buying from social media sellers or beauticians is dangerous. Only GPhC registered pharmacies, always.

Help us keep the record honest

Monj logs which providers state their maintenance floors and which apply them unannounced, and the directory above only improves when people tell us what actually happened. If a pharmacy cut you off without warning, or handled maintenance well, drop Monj a message. We check reports before anything changes on the site.