I Spent Hours Comparing UK Weight Loss Treatment Prices So You Don't Have To

 Let me be upfront about something before we get into this.

I'm not a doctor. I'm not affiliated with any pharmacy. And I'm not here to tell you which weight loss treatment to use. What I am going to do is lay out exactly how pricing works for the three main injectable weight loss treatments available privately in the UK right now — because I spent a frustrating amount of time trying to figure this out myself, and the information scattered across pharmacy websites is genuinely hard to piece together.

So consider this the article I wish I'd found when I first started looking.

First: Why Is There Such a Huge Price Range?

If you've already started Googling, you've probably noticed that the same medication — same drug, same dose, same manufacturer — can be listed at completely different prices depending on the website you're on.

For Mounjaro (tirzepatide), the difference between the cheapest and most expensive provider for the same 5 mg pen can be over £50. That's not a rounding error. That's a genuine pricing gap driven by how much margin each pharmacy adds on top of their wholesale cost.

The drug itself doesn't change. What changes is the pharmacy's pricing strategy, what services are bundled in (consultation, delivery, support programme), and whether any of those costs are disclosed upfront or only appear at checkout.

The Three Treatments: A Quick Overview

Mounjaro (Tirzepatide)

Weekly injection. Acts on two receptors — GIP and GLP-1 — which is why clinical trials have shown it tends to produce higher average weight loss than older options. Available in six dose strengths from 2.5 mg up to 15 mg. You start low and increase every four weeks (or on clinical advice).

Want the full breakdown of how it works? Healthwise360 has a solid explainer on Mounjaro here — written clearly, no sales pitch.

Wegovy (Semaglutide)

Also a weekly injection, but works on the GLP-1 receptor only. Backed by the large STEP clinical trial programme. Now NICE-approved and available through limited NHS pathways, though most people in the UK still access it privately. Five dose steps from 0.25 mg to 2.4 mg.

For context on how Wegovy works: Healthwise360's Wegovy overview is worth a read before you start thinking about cost.

Saxenda (Liraglutide)

The older one of the three. Daily injection (not weekly), GLP-1 receptor only. Generally lower average weight loss in clinical comparisons with Mounjaro and Wegovy. Has been around longer, so there's more long-term data. Some people find the entry-level pricing slightly lower, though daily dosing means you go through pens faster.

Healthwise360's Saxenda guide explains how it compares to the newer options.

What Does Each Treatment Actually Cost?

Here's where it gets detailed. All three treatments use a titration model — meaning you start at the lowest dose and increase over time. Prices go up with each dose step.

Mounjaro — Approximate Price Per Pen (2026)

Dose Price Range
2.5 mg £130 – £180
5 mg £155 – £200
7.5 mg £200 – £270
10 mg £220 – £305
12.5 mg £245 – £315
15 mg £260 – £340

Wegovy — Approximate Price Per Pen (2026)

Dose Price Range
0.25 mg £130 – £170
0.5 mg £145 – £185
1 mg £175 – £220
1.7 mg £215 – £270
2.4 mg £240 – £295

Saxenda — Approximate Monthly Cost (2026)

Titration Stage Estimated Monthly Cost
0.6 mg to 3 mg (daily) £150 – £290/month

All prices are approximate and vary between providers. They're based on data from GPhC-registered pharmacies and are subject to change — always confirm directly with a pharmacy before ordering.

The Hidden Cost Problem

Here's what most comparison articles skip over: the pen price is not the full cost.

On top of what you pay for the medication, many providers also charge for:

  • Initial consultation (sometimes £20–£50, sometimes bundled in)
  • Ongoing prescription renewals (some providers charge per renewal)
  • Delivery (especially for cold chain items, can be £5–£15 per order)
  • Programme or support fees (if the provider runs a structured coaching or monitoring programme)

This means two providers could both advertise "Mounjaro from £160" and one could be genuinely £160 all-in while the other is actually closer to £200 once you hit checkout.

The only way to really compare is to get to the final checkout page — or use a platform that already does this. The best weight loss treatment options in the UK comparison at Healthwise360 does exactly that, pulling live pricing from over 60 GPhC-registered pharmacies and displaying the total across all three treatments side by side.

Annual Cost Reality Check

Just so you can plan ahead — here's a rough annual estimate based on maintenance doses:

Treatment Monthly (Maintenance) Annual (Rough Estimate)
Mounjaro £260 – £340 £3,120 – £4,080
Wegovy £240 – £295 £2,880 – £3,540
Saxenda £200 – £290 £2,400 – £3,480

Most people don't reach the maintenance dose until month 4–6, so year one might average slightly lower depending on how quickly you titrate.

Is the Pharmacy You're Looking At Legit?

This matters more than price, honestly. There are some very dodgy sites operating in this space — selling medications without a proper prescription process, or sourcing from unverified supply chains.

The basics to check:

✅ GPhC registration — all legitimate UK online pharmacies are registered. You can check the number on the GPhC public register

✅ MHRA internet pharmacy logo — should be displayed and clickable on their homepage

✅ Named prescribers — who is actually signing the prescriptions? This should be transparent

✅ Verified reviews — check Trustpilot, not just the testimonials on their own site

For a broader look at how to evaluate providers safely, the UK online pharmacy verification and GPhC safety standards overview at Healthwise360 is a helpful independent reference.

Where to See the Full Price Comparison

If you want to see all of this in one place — every treatment, every dose, every verified provider — the most up-to-date independent resource I've found is the weight loss treatment price comparison at Healthwise360. It covers Mounjaro, Wegovy, and Saxenda across all dose steps with live-updated pricing from verified GPhC pharmacies.

No affiliate links, no sponsored placements, no pressure to buy anything. Just the data.

A Reminder (Because It Needs Saying)

Everything here is for informational purposes only. These are prescription-only medicines that legally require a clinical assessment before they can be dispensed. No reputable provider should ever skip that step — and if one does, that's a red flag in itself.

Do your research, compare properly, and if you're unsure about any aspect of the process, speak to your GP.

This blog post is for informational purposes only and does not constitute medical advice. All prices are approximate and subject to change. The author is not affiliated with any pharmacy or provider.

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