My mate Sarah spent three weeks going back and forth between the two before she just picked one and got on with it. Most people I speak to do the same — they read a few articles, get overwhelmed by the jargon, and either give up or flip a coin.
This isn’t that kind of article.
Wegovy and Mounjaro are both genuinely good weight loss injections. I’m not going to pretend one is perfect and one is rubbish, because the data doesn’t support that. What I will do is walk you through the real differences — clinical results, how the doses actually feel week to week, what you’ll pay privately in 2026, and whether you can skip the GP entirely and order online. All of it, no fluff.
Let’s start from the top.
What Are These Two Drugs, And Why Does Everyone Keep Talking About Them?
Wegovy contains semaglutide. Mounjaro contains tirzepatide. If those names mean nothing to you, that’s fine — what matters is what they do.
Both are weekly injections. You do them yourself, at home, using a pre-filled pen that’s honestly less scary than it sounds. Both are MHRA-licensed for weight management in the UK. Both work by messing with the hormones that control hunger — specifically, they mimic gut hormones that your body releases after eating to signal “right, that’s enough.”
Where they part ways: Wegovy targets one hormone receptor, called GLP-1. Mounjaro goes after two — GLP-1 and something called GIP. GIP is involved in how your body processes fat and regulates blood sugar. That second target is the reason Mounjaro has tended to produce slightly higher weight loss numbers in clinical trials.
Neither one requires a GP referral if you go through a regulated private pharmacy. PPRX offers both — online consultation, UK-registered prescriber reviews it, medication dispatched same or next day. That’s it.
Mounjaro vs Wegovy Effectiveness — Let’s Look at What the Trials Say
For most of 2024 and into 2025, Mounjaro was the runaway winner on paper. The SURMOUNT-5 trial stuck both drugs head-to-head — Mounjaro 15mg versus Wegovy 2.4mg at their then-maximum doses. Mounjaro participants lost 20.2% of body weight on average over 72 weeks. Wegovy came in at 13.7%. That’s nearly seven percentage points.
Then something shifted. January 2026, the MHRA approved a higher 7.2mg Wegovy dose. The STEP UP trial behind that approval showed 20.7% average weight loss at 7.2mg. The gap between the two drugs went from nearly seven points to less than half a point overnight.
At their absolute ceilings — Mounjaro 15mg versus Wegovy 7.2mg — Mounjaro still edges ahead, with some trial data putting it at around 22.5% average weight loss. But “wins by 1.8 percentage points” is a very different conversation to “wins by 6.5 percentage points.”
Practically? Both drugs can now get most people to 20%+ weight loss if they’re tolerated well and doses are increased properly over time. The question of which is “better for weight loss” has genuinely become a question of which is better for you — your budget, how your body handles side effects, whether heart protection matters to you, and how much you’re willing to spend monthly.
How Do Prescription Weight Loss Injections Actually Work in the Body?
After you eat, your gut doesn’t just sit there. It fires off hormones that travel up to your brain and say “we’re done here, stop eating.” GLP-1 is one of those hormones. The problem is, it breaks down quickly under normal circumstances, so the signal doesn’t last.
Wegovy mimics GLP-1 and keeps that signal active far longer than your body naturally would. Appetite drops. Food thoughts quiet down. You eat smaller portions without fighting yourself to do it.
Mounjaro adds GIP on top of that. GIP is tied to fat storage, fat burning, and blood sugar — and when you activate both receptors together, the appetite suppression effect tends to be stronger, particularly at higher doses.
People who’ve been on both often describe it like this: on Wegovy, you feel less hungry. On Mounjaro, you sometimes forget to eat entirely. That’s not universal — plenty of people respond just as strongly to Wegovy — but it gives you a sense of the difference.
The injections go into fatty tissue — stomach, thigh, or upper arm. Once a week, rotate the site. PPRX walks you through the technique when you start.
Wegovy Dosage and Side Effects — What Nobody Tells You Before You Start
The dosing schedule runs: 0.25mg for the first four weeks, then 0.5mg, then 1mg, 1.7mg, 2.4mg. For those approved at the new higher tier from January 2026 — 7.2mg.
Each step lasts roughly a month. You don’t rush it. Rushing is how people end up phoning their GP saying they’ve been sick for three days.
Nausea is the one that catches most people off guard. It’s not constant — it tends to spike in the first week at a new dose and then ease off. Some people describe it as a low-grade queasy feeling that sits in the background. Others feel genuinely rough for a few days. Constipation comes up a lot too. Fatigue is real for some people, particularly in the first couple of months.
Only around 5.4% of trial participants stopped taking Wegovy because of side effects. Worth remembering when you’re in week two of 1mg and questioning everything.
One thing Wegovy does that Mounjaro doesn’t — at least not yet — is protect your heart. It’s the only weight loss injection currently MHRA-approved to reduce the risk of heart attack and stroke. For people with existing cardiovascular disease or high cardiovascular risk, that approval matters and it’s not a minor footnote. Clinical trials showed roughly a 20% reduction in serious cardiac events in that group. If your cardiologist is involved in your care, that conversation is worth having before you choose.
Mounjaro Weight Loss Injections UK — The Full Picture on Doses and Side Effects
Six dose levels: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg. Four weeks at each, generally. The whole journey from starter to full maintenance takes five or six months — sometimes longer if your body needs more time to adjust at a particular level.
Side effects are similar to Wegovy’s in type, though a touch more pronounced during escalation for some people. The jump from 10mg to 12.5mg is one that comes up repeatedly in patient reports — harder on the stomach than earlier increases, then settles. Roughly 6.2% of trial participants stopped treatment because of side effects. Still a minority, but slightly higher than Wegovy.
For people who get through to 15mg and stay there — the results can be remarkable. Someone starting at 100kg losing 22% of their bodyweight isn’t dropping a couple of pounds. That’s 22kg. Three and a half stone. The kind of change that shows up in blood test results, in joint pain, in energy levels, in how clothes fit. Not just the scales.
NHS access to Mounjaro started opening up in June 2025 — but only for patients with a BMI of 40 or above and at least four obesity-related conditions. Most people reading this probably don’t meet that criteria, or if they do, they’re on a wait. Private access through PPRX doesn’t have those restrictions.
Mounjaro Without Informing GP — Can You Actually Do That?
Yes. Fully legal, properly supervised — just private rather than NHS.
UK regulations let licensed online pharmacies prescribe prescription-only medicines, including Mounjaro, after a clinical assessment reviewed by a qualified UK prescriber. There is no requirement for your NHS GP to be looped in at any point. You can tell them if you want to — it’s genuinely worth doing for your medical records — but nobody is making you.
PPRX runs exactly this way. Online health questionnaire, reviewed by a registered prescriber, prescription issued if you’re suitable, medication dispatched cold-chain next-day. That’s the whole process.
Why do people go this route? Loads of reasons. Some were refused by their GP. Some never qualified for NHS weight management services in the first place. Some are international visitors in the UK. Some just want to start now rather than in four months when an NHS referral might come through. All of those are valid.
The one thing that matters: use a GPhC-registered pharmacy. The MHRA has seized counterfeit Mounjaro pens in the UK — some containing genuinely dangerous substances, zero active ingredient. The giveaways for dodgy sites are usually obvious in hindsight: no verifiable pharmacy registration, no real consultation, prices so low they make no sense. PPRX is GPhC-registered and CQC-regulated. You can check it yourself.
Mounjaro Price Comparison UK — What You’re Actually Going to Pay in 2026
September 2025 was painful for anyone on Mounjaro. Eli Lilly revised its UK list pricing, and in some cases the monthly cost nearly tripled compared to early 2025. A lot of patients got a renewal email with a price that looked like a typo.
Realistically, this is what private Mounjaro costs across UK providers right now:
| Dose | Monthly Private Cost (Typical Range) |
| 2.5mg — starter | £124 – £169 |
| 5mg | £149 – £199 |
| 7.5mg | £179 – £229 |
| 10mg | £199 – £259 |
| 12.5mg | £229 – £290 |
| 15mg — full maintenance | £249 – £349 |
The range matters because not all providers are honest about what’s included. Some show you the drug cost, then add consultation fees, needle costs, and delivery charges at checkout. Others load the first month cheap and jump the price at 10mg and above. If you’re comparing on cost, compare the full 18-month journey cost, not the starter price.
NHS route: if you qualify (BMI 40+, four related conditions), you pay the standard £9.90 prescription charge in England, nothing in Scotland, Wales, or Northern Ireland. For most people that’s not a realistic option in 2026 — either they don’t qualify or the wait is too long.
PPRX pricing is all-inclusive — consultation, needles, sharps bin, delivery. No separate charges appearing later. Current prices at pprx.com.
Wegovy Price Comparison UK — Has It Become Better Value Than Mounjaro?
Honestly, for a lot of people right now — yes.
After Mounjaro’s price spike in September 2025, Wegovy moved into a noticeably cheaper position at most dose levels. And with the 7.2mg dose now approved and producing 20.7% average weight loss in trials, the argument for paying more for Mounjaro is less clear-cut than it used to be.
Private Wegovy costs in 2026 look roughly like this:
| Dose | Monthly Private Cost (Typical Range) |
| 0.25mg — starter | £99 – £130 |
| 0.5mg | £119 – £149 |
| 1mg | £125 – £169 |
| 1.7mg | £149 – £199 |
| 2.4mg — standard maintenance | £169 – £299 |
| 7.2mg — higher dose (new) | £219 – £329 |
At the 2.4mg maintenance dose, Wegovy is meaningfully cheaper than Mounjaro month-to-month and produces solid clinical results — averaging around 13–15% body weight loss at that dose. Step up to 7.2mg and you’re looking at Mounjaro-territory results, usually at a lower or comparable monthly cost.
If you’ve got a strong cardiovascular risk factor in your history, Wegovy is also the only one currently approved for heart protection — which changes the value calculation entirely if that applies to you.
Where to Buy Mounjaro Online UK at the Cheapest Price — Don’t Just Search and Click the First Result
“Mounjaro buy online UK cheapest” is one of the most searched terms in this category — and it’s also one of the most dangerous ways to find a provider.
The cheapest Mounjaro online UK isn’t always the safest, or even cheapest when you add everything up. A full treatment journey across 18 months could cost anywhere between £2,300 and well over £5,000 depending on where you buy and what’s included. Getting stung by hidden charges every month adds up faster than the headline price suggests.
Top 10 Things to Check Before You Hand Over Your Card Details
1. GPhC register — look it up yourself. Go to the GPhC website, search the provider’s name. If it’s not there, close the tab.
2. Is the prescribing CQC-regulated? That’s the Care Quality Commission. It means the clinical side has been inspected and is accountable. Not optional.
3. What’s actually included in the price? Drug cost, consultation fee, needles, sharps bin, delivery. Some providers price the drug and charge everything else on top.
4. Do needles come with it? Mounjaro pens don’t include needles in the standard pack. You need them. Check.
5. How does it arrive? Mounjaro needs refrigeration. If the provider isn’t using cold-chain packaging, the medication you receive may already be degraded. Ask directly.
6. What do you pay at 10mg and 15mg? Not just month one. Get the number for your likely maintenance dose before you commit.
7. Is the stock UK-licensed? Genuine UK-licensed stock from an authorised wholesaler. Not imported, not grey market.
8. Can you cancel without hassle? Some providers lock you into subscriptions with complicated cancellation processes. Your circumstances change. Make sure you’re not stuck.
9. Is there clinical support at each dose increase? Moving up doses without anyone checking in is where problems happen. A decent provider checks in at each stage.
10. Are the reviews real? Look for Trustpilot reviews with verified purchases, specific details. Not a wall of five-star one-liners posted within the same week.
PPRX does all of the above — GPhC-registered, CQC-regulated prescribing, all costs in the price shown, next-day cold-chain delivery, prescriber support at every dose stage.
The Jab Is the Start, Not the Whole Story
Something worth saying plainly: the injection does a lot of the heavy lifting, but it doesn’t do everything.
The 20%+ weight loss figures from clinical trials came from participants who also had dietary support alongside their medication. People who combine their Mounjaro or Wegovy treatment with structured nutrition and regular movement consistently do better — in terms of weight lost, how they feel during treatment, and how much they keep off when they eventually stop.
PPRX offers online meal plans put together specifically around GLP-1 treatments. Smaller portions, nutrient-dense, built to reduce nausea during dose escalation and protect muscle mass while fat comes off. We also offer online personal trainer services — not a generic programme, actual structured coaching that works alongside where you are in treatment.
Hair loss is one side effect nobody warns you about enough. It’s called telogen effluvium — basically the body shedding hair in response to rapid weight change and the physical stress of it. It’s temporary for most people, but it’s alarming when it starts. PPRX has hair oil for hair loss and bimatoprost for eyelash and eyebrow restoration already in the range. Minoxidil, dutasteride hair spray, beard spray, and hair gel are all coming shortly — covering the full picture for people going through significant weight loss and everything that comes with it.
Wegovy vs Mounjaro — A Straight Answer for People Who Just Want One
Mounjaro produces marginally greater maximum weight loss. That edge is real, even if it’s smaller now than it was before the 7.2mg Wegovy approval.
Wegovy is usually cheaper — noticeably so since September 2025 — and is the better clinical choice if you have cardiovascular risk factors you’re managing alongside weight loss.
At the 7.2mg dose, Wegovy delivers results that are essentially on par with Mounjaro for most people. At 15mg, Mounjaro still leads but only slightly. The cost difference at those levels is worth factoring in.
Neither is wrong. The one you can sustain — financially, physically, practically — is the one that’ll actually work for you. Mounjaro Weight Loss Consultation
Questions People Actually Ask
Switched from Mounjaro to Wegovy — is that okay? Yes. Wait at least a week between the last dose of one and the first of the other. PPRX can review where to re-enter the Wegovy dosing schedule based on where you were with Mounjaro.
I’ve got type 2 diabetes. Does that change anything? Both help with blood sugar control. If your diabetes is tied to cardiovascular risk — which it often is — Wegovy’s heart protection approval is worth discussing with a prescriber before choosing. PPRX can advise.
What’s the actual NHS criteria for Mounjaro? BMI 40 or above, four or more obesity-related conditions, and you’re in. For now. The rollout is still in its early phases and criteria may expand. Most people don’t meet the current threshold or are waiting for the service to reach their area.
When does the appetite suppression kick in? Most people feel something in the first two to three weeks — less interest in food, smaller portions feeling satisfying. Visible weight change usually takes two to three months. The significant results come at six months and beyond as doses increase.
Do I have to tell my GP if I order through PPRX? No. It’s your choice. Informing them is good practice for your records, but PPRX’s prescribers handle the clinical assessment independently. Nothing about the process requires NHS GP involvement.
