Wegovy vs Mounjaro: the UK cost comparison (2025)

Wegovy® (semaglutide) and Mounjaro® (tirzepatide) are the two most talked-about weight-loss injections in the UK. If you are paying privately, the cost can vary dramatically depending on the pharmacy, the dose and the month — so it pays to compare before you commit. Here is how the two stack up in 2025.

How the two drugs differ

• Wegovy contains semaglutide, a GLP-1 medicine, dosed weekly and titrated over ~16 weeks up to 2.4 mg.
• Mounjaro contains tirzepatide, a dual GLP-1/GIP medicine, dosed weekly and titrated in 2.5 mg steps up to 15 mg.
• Clinical trials suggest tirzepatide can produce greater average weight loss, but individual results vary and tolerability matters just as much as the headline numbers.

What they cost privately in the UK

Private prices are usually quoted per pen, which is roughly a four-week supply. As a rough guide in 2025, monthly private costs commonly fall in the region of £150–£250 depending on dose and pharmacy. Higher doses generally cost more, and prices creep up as you titrate. The single biggest driver of what you pay is which online pharmacy you use — the gap between the cheapest and most expensive UK pharmacy for the exact same pen can be £30–£50 a month.

Why prices vary so much

Pharmacies buy stock at different times and set their own margins, run promotions, and bundle in consultation fees differently. Some quote a low headline price then add a prescription or delivery charge. Because titration means your dose changes every few weeks, the “best value” pharmacy can change during your journey too.

How to make sure you are not overpaying

• Compare the price for your exact current dose, not just the starting dose.
• Check whether consultation and delivery are included in the quoted price.
• Re-check when you step up a dose — the cheapest pharmacy can change.
• Track what you actually paid so you can see your real annual spend.

This is exactly what JabDay Plus does: it tracks what you have paid, compares it against a maintained table of UK pharmacy prices for your current dose, and shows how much you could save each year by switching. Members regularly find they are overpaying by more than the entire annual cost of the app.

Which should you choose?

That is a decision for you and your prescriber, based on your health, tolerability and goals — not on price alone. But once you and your clinician have chosen a medicine, there is no reason to overpay for it. Compare pharmacies for your dose and keep checking as you titrate.