Wegovy Pills vs Mounjaro: How Do They Compare?

Wegovy Pills vs Mounjaro: How Do They Compare?#

If you're weighing up Wegovy tablets against Mounjaro injections, the short answer is this: Mounjaro tends to produce greater weight loss on average, but Wegovy's oral tablet avoids injections entirely and comes in at a lower monthly cost. Which one suits you depends on how much weight you need to lose, how you feel about needles, your budget, and how your body tolerates each medicine. Neither is objectively "better" for everyone.

Both belong to the same family of weight-loss medicines that work on your gut hormones, but they're not identical drugs with different packaging. Let's go through the real differences.

How they work: semaglutide vs tirzepatide#

Wegovy (and the Wegovy tablet) contains semaglutide, a GLP-1 receptor agonist. It mimics a hormone your gut releases after eating, which slows down stomach emptying, reduces appetite, and helps you feel full on less food.

Mounjaro contains tirzepatide, which does the same GLP-1 job but also activates a second hormone receptor called GIP. This dual action is why tirzepatide is often described as a "twincretin". In practical terms, it tends to produce a stronger effect on appetite and blood sugar regulation than semaglutide alone.

The extra mechanism doesn't automatically make Mounjaro the right choice for you. It just means the two drugs aren't working through quite the same pathway, and that shows up in the numbers below.

Efficacy: what the evidence shows#

The table below gives a general guide based on trial data. These medicines weren't always compared directly in the same study, so treat this as an overview rather than a precise ranking.

These are trial averages, not guarantees. Some people respond brilliantly to semaglutide and barely tolerate tirzepatide, and vice versa. Genetics, starting weight, diet, activity levels and how consistently you take the medicine all affect your personal result.

Administration: daily pill vs weekly injection#

This is often the deciding factor for people who've already ruled out cost.

The Wegovy tablet is taken once a day, on an empty stomach, with a small sip of water (no more than half a glass), and you need to wait at least 30 minutes before eating, drinking anything else, or taking other oral medicines. Miss that window and absorption drops significantly. It's a pill that demands a bit of routine discipline.

Mounjaro is a once-weekly injection using a pre-filled pen, given under the skin of your abdomen, thigh or upper arm. There's no fasting requirement and no strict timing window beyond picking a day each week that works for you. Many people find this less fiddly day-to-day, even though the idea of self-injecting puts some people off initially. In practice, most patients get comfortable with the pen within the first couple of doses.

If you travel a lot, have a needle phobia, or dislike the idea of storing medication in the fridge, the tablet has clear appeal. If you'd rather deal with something once a week and forget about it rather than manage a daily fasting ritual, the injection often wins out.

What does each treatment actually ask of you?#

Beyond the mechanics, it's worth being honest about the day-to-day commitment:

• Wegovy tablet: daily timing discipline, empty stomach dosing, gradual dose titration over several weeks
• Mounjaro: weekly injection technique, fridge storage until first use, rotating injection sites to avoid irritation

Both require regular reviews with a prescriber, ongoing monitoring of side effects, and a genuine commitment to dietary changes alongside the medicine. Neither works well as a standalone fix if your eating habits don't shift at all. NICE guidance is clear that these medicines are meant to sit alongside diet and lifestyle support, not replace it.

Side effects#

The side effect profiles overlap heavily because both drugs act on the gut:

• Nausea, particularly in the first few weeks or after a dose increase
• Diarrhoea or constipation
• Vomiting
• Reduced appetite (the intended effect, but it can tip into feeling unable to eat enough)
• Fatigue
• Reflux or bloating

Tirzepatide's dual mechanism means some people report slightly more pronounced GI side effects initially, though this varies enormously between individuals. Both medicines carry a rare risk of gallstones, pancreatitis, and in the case of GLP-1 medicines generally, a theoretical thyroid tumour risk flagged in animal studies (not confirmed in humans, but it's why they're avoided in anyone with a personal or family history of certain thyroid cancers).

Dose titration matters a lot here. Both drugs are started at a low dose and increased gradually over weeks, specifically to reduce how rough the side effects feel. Jumping doses or skipping the titration schedule is one of the most common reasons people end up feeling unwell on either treatment.

UK access and cost#

On the NHS, both tirzepatide and semaglutide are available through specialist weight management services, but eligibility is tightly restricted. NICE recommends these medicines generally for adults with a BMI of 35 or above (or 30+ with a weight-related health condition, sometimes lower for certain ethnic groups where lower BMI thresholds are used), and NHS capacity means many eligible patients still face long waits or aren't able to access treatment through primary care alone.

This is why most people who want prompt access go through a private, GPhC-registered online pharmacy instead. At Totiva, current pricing looks like this:

Wegovy tablets (30-tablet pack, once daily):

• 1.5mg: £99.00
• 4mg: £101.00
• 9mg: £116.00

Mounjaro (weekly injection pen):

• 2.5mg: £136.88
• 5mg: £157.88
• 7.5mg: £207.88
• 10mg: £232.88
• 12.5mg: £248.88
• 15mg: £268.88

Wegovy injection (weekly pen, for comparison):

• 0.25mg to 1mg: £92.88
• 1.7mg: £143.88
• 2.4mg: £188.88

Roughly speaking, the Wegovy tablet is the cheaper starting point of the three options, and Mounjaro sits at the higher end, particularly once you reach the maintenance doses. Over 6-12 months, that difference adds up, so it's worth factoring cost into your decision alongside expected results, not just picking the medicine with the biggest headline weight-loss number.

Supply has been inconsistent for both drugs in the UK over the past couple of years, with periodic shortages affecting specific doses. If your usual dose isn't available, a prescriber can normally advise on a suitable alternative strength or short-term plan rather than leaving you without treatment altogether.

You can see full current pricing and available doses on Totiva's weight loss service page.

Which is right for you?#

There's no single correct answer, but here's a rough way to think it through:

• Want the strongest average weight-loss results and don't mind a weekly injection? Mounjaro's dual mechanism generally edges ahead in trial data.
• Prefer to avoid needles altogether, or want a lower-cost entry point? The Wegovy tablet is the more practical daily option.
• Struggled with GI side effects on one drug before? Switching to the other GLP-1 pathway sometimes helps, though it's not guaranteed, and any switch should happen under medical guidance rather than by trial and error.
• Budget is the main constraint? Compare the total monthly cost across the full dose range you're likely to need, not just the starting dose price.

A prescriber reviewing your health history, current medicines, and previous weight-loss attempts is genuinely the best person to help you decide, because this isn't purely a numbers comparison. Things like kidney function, gallbladder history, and other medicines you take all factor into which option is safer for you specifically.

When should I see a doctor?#

Call 999 or go to A&E if you experience:

• Severe, persistent abdominal pain (possible pancreatitis or gallbladder problem)
• Signs of a severe allergic reaction: swelling of the face or throat, difficulty breathing, widespread rash
• Yellowing of the skin or eyes
• Signs of severe dehydration from persistent vomiting or diarrhoea

For less urgent but still concerning symptoms, such as ongoing nausea that's affecting your ability to eat or drink, contact your prescriber or GP for advice rather than stopping treatment abruptly without guidance.

Frequently asked questions#

Wegovy pill or Mounjaro: which is better? Mounjaro tends to produce greater average weight loss in trial data, largely due to its dual hormone action. The Wegovy tablet avoids injections and costs less per month at Totiva. "Better" really depends on your priorities and how your body responds.

Which weight loss injection is best in the UK? Between the two injectable options, Mounjaro generally shows stronger average results than injectable Wegovy, but both are effective and NICE-recommended for eligible adults alongside lifestyle changes.

What is the difference between Mounjaro and oral Wegovy? Mounjaro is a weekly tirzepatide injection acting on two gut hormone receptors. The Wegovy tablet is a daily semaglutide pill acting on one. Injections generally show slightly stronger average weight-loss results than the tablet form.

Can I switch from Mounjaro to the Wegovy tablet, or the other way round? Yes, people do switch between them, usually because of side effects, cost, or a preference for pills over injections. This should be planned with a prescriber, as dosing isn't a simple like-for-like swap and your body may need a re-titration period.

Do I need a blood test before starting either treatment? Most UK online pharmacies, including Totiva, will ask about your medical history and may request recent blood tests or basic health information as part of the consultation, particularly if you have existing health conditions.

Key takeaways#

• Mounjaro (tirzepatide) generally produces greater average weight loss than Wegovy, due to its dual hormone mechanism.
• The Wegovy tablet offers a needle-free daily option at a lower starting cost than Mounjaro.
• Side effects overlap significantly between the two, mainly gut-related, and both require gradual dose titration.
• NHS access is limited by strict eligibility criteria, which is why many people use private, pharmacist-led services instead.
• The right choice depends on your goals, tolerance for injections, budget, and how your body responds, ideally worked through with a prescriber rather than decided on trial data alone.

If you're trying to decide between the two, a proper conversation with a pharmacist beats guessing from online reviews. Totiva runs free, pharmacist-led online consultations for weight loss treatment, and if you're approved, you only pay for the medicine itself, with no subscription tie-in. You can start a weight loss consultation whenever you're ready to talk it through.