Wegovy vs Mounjaro Cost: Which Actually Works Out Cheaper in the UK?

If you're weighing up Wegovy and Mounjaro as treatment options, the cost question comes up quickly. Both are once-weekly injections for weight management. Both require a prescription. But their pricing structures are different, and the gap between them isn't straightforward.

Here's a proper breakdown of the Wegovy vs Mounjaro cost comparison in the UK.

When people search for the best Wegovy price UK, they're usually looking for the lowest number. That's understandable. But two providers offering Wegovy at the same dose can vary significantly in what's actually included.

One might include regular clinical check-ins, a dedicated support team, anti-sickness medication, and access to a registered dietitian. Another might dispatch medication with minimal ongoing contact. Both are legal. Both are regulated. But they're not the same thing.

Price is one dimension of value. It's not the only one.

Wegovy contains semaglutide. Mounjaro contains tirzepatide. They work differently at a biochemical level; Wegovy acts on one hormone pathway (GLP-1); Mounjaro acts on two (GLP-1 and GIP). That dual mechanism is part of why Mounjaro tends to produce greater average weight loss in clinical trials.

But this article is about cost, not clinical comparison. So: what do they actually cost?

Both treatments start at low doses and titrate upwards. Wegovy begins at 0.25mg; Mounjaro at 2.5mg. These starter doses are typically the cheapest point in the treatment cycle.

At the starter dose, Wegovy is generally cheaper than Mounjaro across most UK providers. The gap is meaningful as you can find Wegovy at the introductory dose for under £100 a month from some providers; comparable Mounjaro pricing typically starts around £130–£160.

If starter dose cost is the only metric, Wegovy wins on price.

Most patients don't stay on starter doses indefinitely. Wegovy titrates through 0.5mg, 1mg, and 1.7mg to reach the maintenance dose of 2.4mg. Mounjaro works its way through five increments to a maximum of 15mg.

At maintenance doses, the price gap between Wegovy and Mounjaro narrows or reverses depending on the provider. Some UK providers charge broadly similar monthly rates for Wegovy 2.4mg and Mounjaro at mid-range doses. At higher Mounjaro doses (10mg, 12.5mg, 15mg), the cost typically exceeds Wegovy at its equivalent maintenance point.

So the full-course cost comparison depends heavily on which dose you stabilise at, and for how long.

This matters more than most people expect when comparing cost.

Clinical trials show tirzepatide (Mounjaro) produces greater average weight loss than semaglutide (Wegovy). In the SURMOUNT-1 trial, tirzepatide at its highest dose produced an average weight reduction of around 22.5%. Wegovy's equivalent figure in the STEP 1 trial was approximately 14.9%.

If a more effective treatment means you reach your target weight faster and can taper or stop sooner, the higher monthly cost of Mounjaro may represent better overall value. That's just a cost modelling question worth thinking through.

When comparing Wegovy and Mounjaro on cost, these questions give you a more complete picture:

One thing that often surprises people: the same drug at the same dose can vary by £80–£120 per month between UK providers. That price variation between providers is often larger than the price difference between the two drugs themselves.

Which means: the most impactful thing you can do for your budget is compare providers — not just treatments. Once you know which medication is appropriate, use a proper comparison tool to find the best price for that specific drug at each dose level.

Wegovy is generally cheaper at starter doses. Mounjaro tends to be more expensive at higher doses. But the long-term cost difference depends on clinical response, dose stabilisation, and which provider you use.

Neither is categorically 'cheaper.' The right comparison is: cheapest appropriate treatment, from the best-value provider, at the dose you're likely to stay on.