Your guide to switching from Mounjaro to Wegovy 

You can switch from Mounjaro to Wegovy if your pharmacist thinks it’s safe and suitable for you.  You will usually need to wait 30 days between your last dose of Mounjaro and your first dose of Wegovy to make sure the medication is out of your system. You will also need to adjust your dosage depending on what dose of Mounjaro you were previously taking.

In this article, we cover what to expect when switching from Mounjaro to Wegovy so you can continue your weight-loss journey safely with the treatment that is best for you.

How to switch from Mounjaro to Wegovy

• Request Wegovy by completing an online consultation for our pharmacists to review
• If suitable, we will issue a Wegovy prescription
• Take your last dose of Mounjaro, then wait at least 30 days before your first dose of Wegovy
• After 30 days have passed, start Wegovy at the dose your pharmacist recommends
• Take Wegovy as a once-weekly injection (same as Mounjaro), on the same day each week

Can I switch to Wegovy if my BMI is below 27?

Possibly. If you already take Mounjaro and have lost weight, or you are using it to maintain your target weight, you may still be able to switch to Wegovy. Our clinical team will review your medical history and decide if it is safe and suitable for you.

How do I stop taking Mounjaro?

Do not stop Mounjaro until our pharmacists or your prescriber confirms the switch to Wegovy is possible. When approved, take your last dose, then wait at least 30 days before starting Wegovy. You do not need to do anything else — just do not take another dose of Mounjaro.

How do I start taking Wegovy?

Start Wegovy at least 30 days after your last Mounjaro dose, at the dose your prescriber recommends. Use the once-weekly pre-filled pen and inject into your tummy, thigh, or upper arm on the same day each week. For pictures and full steps, see our injection guide.

Will I experience side effects when switching from Mounjaro to Wegovy?

Since both weight loss injections work similarly, most people transition smoothly with minimal side effects. You might experience mild nausea or stomach upset for 1-2 weeks as your body adjusts, though some people notice no difference.

If you've tolerated Mounjaro well, you'll likely do fine on Wegovy. Your prescriber may start you on a low dose and increase gradually to minimise any side effects.

Frequently asked questions:

Can I switch back to Mounjaro after switching to Wegovy?

Yes. If you want to switch back to Mounjaro, you should be able to as long as your prescriber thinks it’s correct for you to do so. They’ll need to understand why you’re switching back to make sure it’s the right decision for your health.

Is it safe to switch from Mounjaro to Wegovy?

Yes. It’s considered safe to switch from Mounjaro to Wegovy as long as you’re following your prescriber's instructions on how to do so. This means leaving at least 30 days between your final Mounjaro dose and first Wegovy dose, and ensuring Wegovy is safe and suitable for you to take.

Will I experience withdrawal when I stop taking Mounjaro?

There are no “withdrawal” symptoms in the usual sense. Some people notice their appetite increases as the medicine wears off, and any side effects usually settle after stopping. If you feel unwell or are unsure what to expect, speak to our pharmacists.

If I switch to Wegovy, do I need to start from the lowest dose?

If you’re switching to Wegovy from a higher dose of Mounjaro, it’s unlikely that you’ll need to start from the lowest dose. Your starting dose of Wegovy will depend on what dose of Mounjaro you were on, and what your prescribing pharmacist thinks is safe and suitable for you.

Will I gain weight while switching from Mounjaro to Wegovy?

It’s unlikely you’ll gain weight when switching, as the effects of Mounjaro will continue during the 30 days after your final dose. You will then immediately start taking Wegovy, which will continue to work in the same way. This means you can continue losing weight while switching, especially if you’re sticking to your diet and exercise plan.

Do I need to change my diet after switching?

No, most people won’t need to make any changes, especially if they’re already following a healthy diet. As with Mounjaro, it’s best to stick to a well-balanced diet and limit high-fat foods, alcohol, and caffeine, as these can trigger or worsen symptoms like nausea and indigestion. If you’re already eating well on Mounjaro, there should be nothing to worry about.

Why should I switch to Wegovy from Mounjaro?

There are many reasons you might want to switch from Mounjaro to Wegovy, whether it’s due to cost or how the treatment is working for you. What matters most is finding a treatment that supports your weight loss journey. The decision is yours to make with your prescribing pharmacist, and there’s no “right” or “wrong” choice, only what works best for you. We’ll make sure you’re on the right treatment for your needs, so you can lose weight safely and sustainably to achieve and maintain a healthy BMI.

Get healthcare support when you need it

Whatever weight loss medication you would prefer, our dedicated team is here to support you every step of the way. If you need guidance, call us on 01695 474 433 or submit your request directly here.

"We're committed to making your healthcare journey as simple, safe and convenient as possible," explains Jason. "When you order from us, you'll benefit from expert clinical support, convenient reorder reminders, and carefully curated resources to help you maintain momentum toward your weight loss goals."