Mounjaro stock and availability in the UK: what to do about shortages

Mounjaro (tirzepatide) has been in and out of supply across the UK since 2024, and the pattern isn't over. If your usual pharmacy is showing a specific dose as out of stock, that doesn't mean the medicine has vanished — it usually means one supply line is squeezed while others still have pens on the shelf. This guide explains the current Mounjaro stock picture in the UK, why shortages hit certain doses, and the exact steps to take so a supply gap doesn't interrupt your treatment.

Why is there a Mounjaro shortage in the UK?

Demand for GLP-1 and dual-hormone weight-loss injections has grown far faster than manufacturers planned for. Mounjaro is the only dual-hormone jab licensed in the UK — it acts on both the GIP and GLP-1 receptors — and it's linked to the largest average weight loss of the current options (around 21–22% of body weight over 72 weeks at higher doses in the SURMOUNT-1 trial). That reputation drives demand, and demand periodically outruns the supply of specific pen strengths.

The MHRA and the manufacturer have flagged intermittent supply pressure on individual doses rather than a total outage. In practice that means:

• One strength (say 5 mg or 10 mg) is unavailable for a few weeks while other strengths ship normally.
• Availability differs between pharmacies, because each wholesaler and pharmacy holds different stock at any given moment.
• Supply tends to recover, then a different dose comes under pressure as more people move up the dosing ladder.

None of this is a reason to panic-buy or to look outside regulated routes. It's a reason to know your options before you need them.

How to check Mounjaro stock before you order

You don't have to guess. Every legitimate UK provider only takes payment once a prescriber has approved you and stock is confirmed, so a quick check saves you a wasted consultation.

1. Check your exact dose, not just "Mounjaro". A provider can have 2.5 mg in stock and 7.5 mg out. Availability is dose-specific.
2. Look for a live stock note at the point of dose selection. Regulated pharmacies flag out-of-stock strengths before you pay, not after.
3. Have a second regulated provider ready. If your first choice is out, a comparison table (like the one below and on our homepage price table) lets you switch in minutes.
4. Never substitute the source. If regulated pharmacies are short, the answer is to wait or switch pharmacy — not to buy "compounded tirzepatide" or ship pens from abroad without a prescription. Those routes are unregulated, unlicensed and genuinely dangerous.

Where Mounjaro is available right now: 24 regulated providers

The strongest defence against a shortage is choice. Below is a sample of the GPhC- and CQC-regulated providers we track that stock Mounjaro, sorted by ongoing 5 mg price. Because they source through different supply lines, it's rare for all of them to be short of the same dose at once. Prices are the 2.5 mg starter pen (four weeks) and the 5 mg maintenance pen; prices last checked 4 July 2026.

A sample of the 24 regulated providers we track; see the full, price-sorted list on the homepage table. Providers are GPhC-registered pharmacies or CQC-regulated services. This is price and availability information, not an offer of supply — always confirm the current price and stock on the provider's own website. Listing order is by price and can never be paid for.

What to do if your dose is out of stock

A shortage is an inconvenience, not an emergency — but a gap in a weekly injection is worth handling properly. Here's the practical sequence.

1. Don't skip ahead or double up

If you can't get your current dose, do not jump to a higher strength just because it's available, and don't take two lower pens to "make up" a dose. The dosing ladder exists to limit side effects: 2.5 mg for four weeks as a starter, then 5 mg, then 2.5 mg steps up to a maximum of 15 mg, at least four weeks apart. Changing that off your own back is a decision for your prescriber, not for you.

2. Check a second regulated provider

This is the single most effective fix. Because each pharmacy sources independently, one being out of your dose rarely means all 24 are. Use the table above or our guide to where to buy Mounjaro online to line up an alternative that has your strength.

3. Ask your prescriber about a short break or bridge

If no regulated provider has your dose, message your prescriber. Missing a single weekly dose is not the same as stopping treatment, and a clinician can advise whether to wait, hold at your current dose, or adjust the plan. Providers that include ongoing clinical support — monthly video reviews, for example — make this far easier than one-off dispensing.

4. Never fill the gap outside the regulated system

The temptation during a shortage is to accept a "compounded" version or an unbranded pen from a social-media seller. Don't. These are not the licensed medicine, there's no UK regulator standing behind them, and you have no idea what's in the pen. There is no legal grey area here: buy through a GPhC-registered pharmacy or a CQC-regulated clinic, or don't buy at all.

Will Mounjaro shortages continue in 2026?

Supply has improved compared with the tightest periods of 2024–25, but intermittent pressure on individual doses is likely to persist while demand keeps climbing and more people move up the ladder to higher strengths. The sensible planning assumption is: your medicine will be available, but your specific pharmacy and specific dose might not be on any given week. Keeping a regulated alternative in your back pocket — and choosing a provider with proper clinical support — is what turns a shortage from a crisis into a five-minute switch.

For more on the buying side, see our guides on Mounjaro price per pen, who's eligible for Mounjaro, and how to start Mounjaro in the UK.

Frequently asked questions