Zepbound

dr brenda ikeji medical editor

Medically reviewed by

Dr Brenda Ikeji

Last reviewed: 23 Dec 2024

Zepbound is a prescription weight loss pen containing tirzepatide, just like Mounjaro. It is used for weight loss in adults with obesity or who are overweight and have certain medical conditions. The active ingredient tirzepatide mimics 2 hormones that can regulate your appetite by sending signals to the brain, while also slowing digestion, so you feel fuller from the food you eat.

Zepbound and Mounjaro are manufactured by the same company, Eli Lilly and Company. The main difference is that Zepbound is not available in the UK while Mounjaro is. Zepbound is just the branded name for tirzepatide weight loss injections in the USA. This means getting a prescription for Mounjaro is the same as getting one for Zepbound, they just have different names.

Contents
 

What is Zepbound?

Zepbound is a weight loss treatment that is not available to purchase in the UK. It contains tirzepatide, a prescription-only medication that can be used for 2 conditions: weight loss and type 2 diabetes. It comes in the form of an injectable pen, containing 4 doses you inject yourself once per week at around the same time.

Zepbound is only prescribed for weight loss and is the brand name for tirzepatide in the USA. It’s manufactured by the same company that makes Mounjaro, called Eli Lilly.

How does Zepbound work?

Zepbound’s active ingredient, tirzepatide, mimics 2 hormones that are usually released after eating, called glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP).

These are both a type of incretin hormone, working in 3 main ways:

  1. Slowing down the rate at which you digest food to keep you feeling full for longer.
  2. Signalling to your brain that you’re full, lowering appetite.
  3. Regulating blood sugar by increasing insulin levels.

As tirzepatide mimics these hormones, the same receptors in your body are triggered, tricking your body into carrying out the same actions. When you take Zepbound (or Mounjaro) week after week, you should notice you feel less hungry, can eat less, and feel full after eating and between meals. If you also have conditions like prediabetes, it could help to improve your blood sugar levels and reduce cravings caused by spiking sugar levels.

Zepbound dosage schedule

Zepbound is prescribed at the lowest dose of tirzepatide: 2.5mg for 4 weeks. You’ll then increase the dosage every 4 weeks, although you can choose to stay on a lower dose for longer if you need more time to get used to the treatment, or if it’s working well for you at a lower dose.

As Mounjaro is the UK version of Zepbound, it’s taken in the same way:

Mounjaro weekly dosage guide to follow while taking the medication

How to take Zepbound

Zepbound is injected using your injection pen and a fresh needle. Unlike other injections such as vaccinations, these needles are small in size and safe to use at home. You can inject Zepbound into your:

  • upper arms (if someone can help you)
  • stomach
  • upper thigh

It’s best to read the information that comes with your injection and follow the instructions carefully. We also have a guide on how to inject Mounjaro, which is the medication that follows the same steps.

Zepbound side effects

The most common side effects of Zepbound (and Mounjaro) include:

  • nausea
  • vomiting
  • diarrhoea
  • constipation

These side effects are not usually severe and happen most often when you first start taking tirzepatide. They should decrease over time but if they do not, or you’re struggling to manage them, you should speak with your doctor straight away.

➤ Read more about Mounjaro side effects (the UK version of Zepbound), including how long they could last and how to manage them.

Zepbound vs Mounjaro

Zepbound and Mounjaro are brand names for the active ingredient tirzepatide when taken for weight loss. They’re both taken alongside a healthy, balanced diet programme and regular exercise as this can provide the best results.

Nearly everything is the same when comparing Zepbound and Mounjaro. The only difference is that Zepbound is the brand name in the USA while Mounjaro is the brand name in the UK. Mounjaro is also available for type 2 diabetes in both countries.

Zepbound Mounjaro
Active ingredient

Tirzepatide

Tirzepatide

Where you can buy it

In the US 

In the UK 

Dosage

Starting at 2.5mg, with a maximum dose of 15mg

Starting at 2.5mg, with a maximum dose of 15mg

How to take it

Weekly injection using a self-injectable pen

Weekly injection using a self-injectable pen

Do you need a prescription?

Yes

Yes

Zepbound vs Mounjaro effectiveness

Tirzepatide at the maximum dose of 15mg per week when taken for 72 weeks can lead to an average weight loss of up to 22.5% from starting weight. If you do not want to take the maximum dose, other maintenance doses still provide effective results. In the same trial, people taking 5mg lost up to 16% of their weight, while those taking 10mg lost up to 21.4%. You’ll get the best results if you follow your treatment regime and Mounjaro diet plan, alongside regular exercise.” – Dr Brenda Ikeji, Medical Editor.

➤ Want to know more about the effectiveness of Mounjaro? Our Mounjaro weight loss week-by-week guide can give you an idea of what to expect during your treatment journey, alongside tips to improve your results.

How to buy Zepbound in the UK

You cannot buy Zepbound in the UK or get a Zepbound prescription. However, this does not mean you are missing out. Mounjaro is exactly the same medication and is available in the UK on prescription for weight loss if you have a body mass index (BMI) of:

  • 30 or over, which is classed as obesity
  • between 27 and 30, alongside at least 1 weight-related health condition, which may include high cholesterol levels, high blood pressure, prediabetes, and cardiovascular disease

Not only does Mounjaro help with weight loss, but it can also improve your chances of managing these weight-related conditions.

Where can I buy Mounjaro?

You can buy it with a prescription in the UK from private and regulated services, including Asda Online Doctor, if you meet the BMI requirements and do not have any medical conditions or take any medications that would make tirzepatide unsuitable.

To buy Mounjaro online through our weight loss service:

  1. Complete a short questionnaire which asks only for relevant information regarding your medical history to determine whether Mounjaro is suitable.
  2. Send in some confidential photos that show your current weight so our doctors can make sure Mounjaro is safe for you.
  3. Once everything is submitted, a registered doctor will check your details and photos, and prescribe Mounjaro if it’s suitable.
  4. Your medication will be delivered to your home, and you’ll get a weight loss support pack and ongoing support and advice from our doctors whenever you need it, for free, in your patient account.

from £179.00

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Zepbound (tirzepatide) alternatives

Aside from Mounjaro, there are a number of other treatment options available that do not contain tirzepatide, including weight loss injections and weight loss pills.

Zepbound vs Wegovy

Wegovy is another weight loss injection often recommended as an alternative for Zepbound and Mounjaro. It mimics GLP-1, so works in almost the same way as tirzepatide does. The active ingredient semaglutide is also taken following a dosage schedule, with a maximum maintenance dose of 2.4mg once per week.

Zepbound Wegovy
Active ingredient

Tirzepatide

Semaglutide

Type of medication

Injection

Injection

Prescription-only?

Yes

Yes

Starting weight loss

Up to 22.5%

Up to 15%

Zepbound vs liraglutide

Liraglutide is a generic weight loss injection first released under the brand name Saxenda. It mimics GLP-1 too, working just like Wegovy. The main difference is that you take liraglutide once a day, rather than once a week. The maximum daily dose is 3mg, and you’ll follow a dosage schedule like Zepbound.

Zepbound Liraglutide
Active ingredient

Tirzepatide

Liraglutide

Type of medication

Injection

Injection

Prescription-only?

Yes

Yes

Starting weight loss

Up to 22.5%

8% on average

Zepbound vs orlistat

Orlistat is a weight loss pill, rather than an injection. It works by reducing how much fat you absorb from meals and is taken 3 times a day for the best effect. It’s recommended to eat about 10% of your daily fat intake over 3 meals, with no more than 30% of your daily calories coming from fats.

Like Zepbound, it must be taken alongside a healthy diet plan and regular exercise. Orlistat comes in 3 forms:

  1. Generic orlistat: A generic version of the medication with 120mg of orlistat.
  2. Xenical: Branded tablets that are exactly the same as the generic treatment, just sold under a different manufacturer.
  3. alli: Another branded version of orlistat, however, this can be bought over the counter as it contains only half of the normal dose.
Zepbound Orlistat
Active ingredient

Tirzepatide

Orlistat

Type of medication

Injection

Tablet

Prescription-only?

Yes

Yes, except for alli (60mg orlistat capsules)

Starting weight loss

Up to 22.5%

5% or more

Zepbound vs Mysimba

Mysimba is a weight loss pill taken every day. Like Zepbound, it follows an increasing dosage schedule, up to a maximum dose of 2 tablets, twice a day. The active ingredients naltrexone and bupropion work on your brain to reduce and manage appetite and cravings.

Zepbound Mysimba
Active ingredient

Tirzepatide

Naltrexone and bupropion

Type of medication

Injection

Tablet

Prescription-only?

Yes

Yes

Starting weight loss

Up to 22.5%

8.1% on average

Frequently asked questions

Can I travel with Zepbound?

Yes, you can travel with Zepbound if you have been prescribed it in the US and are travelling. If you’re a UK citizen and want to try tirzepatide for weight loss, you can use Mounjaro instead. You can also travel with Mounjaro and when you get a prescription from us, we’ll also write a GP letter you can use when travelling to another country.

What is the price for Zepbound in the UK?

Zepbound, although it’s the same as Mounjaro, isn’t licensed as a medication in the UK. This means you cannot get it legally in the UK, and if you somehow find it somewhere selling it illegally online, you’ll likely be paying much more as it’s harder to get and would need shipping from the US.

Mounjaro (which contains the same active ingredient) is available in the UK from private online doctor services with a prescription, and the cost for a month’s supply starts from £179.00 at Asda Online Doctor. This price includes a free prescription and ongoing doctor advice and support, alongside a weight loss support pack. You can even get it delivered quickly, straight to your front door.

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Medically reviewed by:
Dr Brenda Ikeji Medical Editor

Brenda studied medicine at St Georges University of London and has most recently worked in John Radcliffe Oxford University Hospitals, covering acute and general medicine.

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Last reviewed: 23 Dec 2024



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