Is There a 10 mg Mounjaro Shortage — and What Should You Do?

The biggest misconception: a shortage means you need to find another source fast

This is the one worth setting down gently. When a specific Mounjaro strength becomes hard to source, a lot of people assume the logical fix is to find it wherever it's available, including sellers on social media or marketplace sites. That instinct is understandable; you've made progress, you don't want to lose it, and the next dose feels like the obvious thing to protect.

The problem is that tirzepatide is a prescription-only medicine. Buying it outside a registered pharmacy, from a seller who isn't asking for a valid prescription, is both illegal and genuinely dangerous. The MHRA has documented seizures of fake weight-loss pens that looked identical to the real product, some contained entirely different substances. A supply gap is frustrating. Sourcing medicine from an unverified seller is a risk of a different order. Report any suspicious seller at the MHRA's Yellow Card scheme, which handles suspect products as well as side effects.

The right response to a shortage isn't to find an alternative source. It's to talk to your prescriber about what the gap means for your specific programme.

What actually happens during a dose shortage, and why staying at one dose isn't automatically a failure

Mounjaro is titrated gradually. The 10 mg dose sits in the middle of the six-strength schedule (2.5, 5, 7.5, 10, 12.5 and 15 mg) and most people reach it after several months of treatment. If you want a closer look at what treatment involves at that stage, our guide to 10 mg Mounjaro covers what to expect from that specific strength, including how it fits into the broader titration schedule. If 10 mg pens are temporarily unavailable, a prescriber has a few considered options.

One is a planned pause at 7.5 mg while the higher strength becomes available. Staying at a working, tolerated dose for a few extra weeks is not the same as going backwards. The appetite-regulating and blood-sugar effects of tirzepatide don't switch off during a brief hold at an intermediate dose. Another option, where clinically appropriate, is reviewing whether titration to 12.5 mg is suitable if 10 mg cannot be obtained but higher strengths are in stock, though that is a clinical call, not a self-directed one. You can read more about how the dose range works on our guide to the full Mounjaro dose range.

What a prescriber will not recommend: doubling up on lower doses to approximate the missed strength, splitting pens, or skipping doses speculatively. The licensed schedule exists because tolerability depends on it.

How to navigate a supply gap without compromising your safety

The first step is straightforward: contact your prescriber or pharmacy as soon as you're aware of a potential gap, before you run out. A registered pharmacy with genuine supply-chain relationships (sourcing directly from Eli Lilly's authorised UK distribution network) will have better and earlier visibility of stock issues than you will through secondhand reports online.

For context on what private treatment costs at different doses and how pricing is structured, our Mounjaro cost guide explains what's typically included and what to watch for. It won't resolve a stock issue, but understanding the pricing landscape helps you recognise when a deal looks implausible.

If you're currently on treatment and concerned about continuity, our support team is available seven days a week. At nume, every repeat order goes through a fresh clinical review by a GPhC-registered prescriber, which means if your due dose is unavailable, you get a real clinical conversation about what comes next, not an automated substitution.

The NHS's own guidance on tirzepatide, published at nhs.uk/medicines/tirzepatide, includes patient-level information on dosing, storage and what to do if a dose is missed, and it's worth bookmarking for exactly these situations.

If you haven't started Mounjaro yet and are planning to begin at a lower dose

Supply gaps at 10 mg are less immediately relevant if you're at the beginning of a programme. Treatment starts at 2.5 mg regardless of eventual target dose, and shortages at higher strengths don't predict what will be available months down the line. Shortages tend to be temporary and dose-specific.

What matters most before starting is that you go through a proper clinical assessment. A full overview of Mounjaro covers the eligibility criteria, how the medicine works and what to expect from the programme. If you're weighing up different treatment paths, our treatment overview sets out the options clearly.

When you're ready to take the next step, check your eligibility with a free consultation, a prescriber will review your situation the same day and be honest about what's appropriate for you.