Switching from Wegovy to Foundayo: What You Need to Know

Thinking About a Switch?

If you have been taking Wegovy, whether as a weekly injection or the daily pill, you may have wondered whether Foundayo could suit you better. Since the MHRA approved Foundayo in August 2026, more patients have been asking the same question: can I switch, and should I?

The short answer is that switching is possible for many people, but it is a medical decision that should be planned with a prescriber. Wegovy and Foundayo work in similar ways, yet they contain different medicines, follow different dosing schedules and produce different average results.

In this guide, the clinical team at Weight Medics explains why people switch, what the research shows, how the process usually works and what to expect along the way.

Why People Switch from Wegovy to Foundayo

Everyone’s reasons are personal, but a few come up again and again.

• Moving away from needles. Some people are happy with their Wegovy results but tired of weekly injections. Foundayo offers a needle free way to continue GLP 1 treatment.
• A simpler daily routine. The Wegovy pill must be taken on an empty stomach, followed by a 30 minute wait before eating or drinking. Foundayo can be taken at any time, with or without food, which suits busy mornings, shift work and people taking other medicines.
• Maintaining weight loss. Once people reach their goal, many want an easier long term option to help keep the weight off.
• Travel and storage. Injection pens usually need fridge storage before use. Tablets are simple to carry wherever you go.
• Type 2 diabetes. In the UK, Foundayo is licensed for both weight management and type 2 diabetes, which may make it a good fit for people managing both conditions.
• Cost. Eli Lilly has said Foundayo will be priced lower privately in the UK than Mounjaro. Depending on your current dose and provider, a tablet may be more affordable.

You can compare tablet options, prices and support on our Daily Weight Loss Tablets page.

What the Research Says About Switching

The most useful evidence comes from Eli Lilly’s ATTAIN MAINTAIN trial, which looked at exactly this question. It included 376 adults who had already lost weight after up to 72 weeks on the highest tolerated doses of Wegovy or Zepbound injections (Zepbound is the US name for Mounjaro). Once they reached a weight loss plateau, they switched directly to a daily dose of orforglipron, the active ingredient in Foundayo, or to a placebo, and were followed for a year.

The results were encouraging:

• People who switched from Wegovy to Foundayo kept almost all of their previous weight loss, regaining only 0.9 kg on average after 52 weeks.
• At 24 weeks, the Wegovy to Foundayo group had held their weight steady, while those switched to placebo had regained an average of 9.4 kg.
• Side effects were in line with earlier Foundayo studies, and only 4.8% of people switching from Wegovy stopped because of side effects.

The key lesson is twofold. Foundayo appears to be an effective way to maintain results after Wegovy, and stopping GLP 1 treatment altogether often leads to rapid weight regain.

It is worth noting that this trial involved people switching from the Wegovy injection. There is less data on moving from the Wegovy pill, although the two contain the same medicine and a similar approach is expected. For more on how Foundayo performs in people starting treatment, see our guide to Foundayo weight loss results.

How the Switch Usually Works

Every patient is different, so your prescriber will tailor the plan to you. In general, the process looks like this:

1. Clinical review. Your prescriber checks your current Wegovy dose, your weight loss so far, any side effects and your medical history, including other medicines you take.
2. Choosing your starting dose. Foundayo comes in several strengths. Your prescriber decides which dose to start on based on your current treatment and how well you tolerate GLP 1 medicines.
3. Timing the changeover. Your prescriber will tell you exactly when to take your first Foundayo tablet. If you use the Wegovy injection, this is often around when your next weekly dose would have been due. Never take both medicines together unless your prescriber specifically tells you to.
4. Settling into your new routine. Take Foundayo once a day at a time that suits you, swallowing the tablet whole without breaking, crushing or chewing it.
5. Follow up and adjustment. Regular check ins let your prescriber review your weight, side effects and wellbeing, and adjust your dose if needed.

Never switch on your own or stop Wegovy without advice. A gap in treatment can allow appetite to return quickly, and starting at the wrong dose may increase side effects.

What to Expect After Switching

Side Effects

Because Wegovy and Foundayo both act on GLP 1 receptors, their side effects are similar. You may notice some nausea, diarrhoea, constipation, indigestion or vomiting in the first few weeks, especially after a dose change. These effects are usually mild and tend to settle. Eating smaller meals, eating slowly and staying well hydrated can help. Rare but serious risks, such as pancreatitis and gallbladder problems, apply to the whole drug class.

Results

Foundayo produced slightly less average weight loss than Wegovy in separate clinical trials. That is why many people use it mainly to maintain their results rather than to lose large amounts of extra weight. If you still have significant weight to lose, your prescriber may suggest staying on an injection for longer before switching.

Who May Not Be Suited to Switching?

Foundayo may not be the right choice if you are pregnant, planning a pregnancy or breastfeeding, or if you have a history of pancreatitis or certain thyroid cancers. It may also be less suitable if you are still actively losing weight and want the strongest possible effect. In that case, staying on Mounjaro and Wegovy injections may serve you better.

For people who cannot take GLP 1 medicines, other routes exist. Our page on Phentermine & Diethylpropion Tablets UK explains these short term appetite suppressants and who may be suitable.

Frequently Asked Questions

Can I switch straight from Wegovy to Foundayo?

In many cases, yes. In the ATTAIN MAINTAIN trial, people switched directly from Wegovy injections to Foundayo without a break. Your prescriber will decide the right timing and starting dose for you.

Will I regain weight after switching?

Most people in the trial kept almost all of their weight off, regaining less than 1 kg on average over a year. Results vary, so ongoing healthy habits remain important.

Can I switch from the Wegovy pill to Foundayo?

Yes, this is often possible. Both contain GLP 1 medicines, and the change is usually simple, but it should always be arranged by a prescriber.

Will I get side effects again after switching?

You might notice mild stomach symptoms for a short while, particularly after a dose change. These usually settle within a few weeks.

Can I switch back to Wegovy if Foundayo does not suit me?

Yes. If Foundayo is not working well for you, your prescriber can discuss returning to Wegovy or trying another treatment.

Do I need to fast when taking Foundayo?

No. Unlike the Wegovy pill, Foundayo has no food, water or timing rules. You can take it whenever suits you each day.

Final Thoughts

Switching from Wegovy to Foundayo can be a smart move if you want a needle free option, a simpler daily routine or an easier way to maintain your results. Early trial data shows that most people keep their weight off after making the change. The key is to switch with proper medical guidance, so your new treatment is safe, well timed and right for your goals.