Foundayo Side Effects

Posted on September 9, 2026 by Sally-Anne Turner

Foundayo Side Effects

What Should You Expect When Starting Treatment?

A new addition to the GLP-1 treatment family has landed in the UK.

Known as Foundayo, or orforglipron, this oral medication comes with no fasting period before or after you take it and can be taken at any time of the day. It is predicted to be as popular as the Wegovy pill, and the oral GLP-1 is already flying off the shelves of online pharmacies.

Of course, what people who want to undertake this oral medication want to know is how it will affect them if they take it. It is not without side effects and, like other GLP-1 medications, the majority of these tend to be gastrointestinal.

However, at the Bodyline Clinic, we can help those who come to us for GLP-1medication manage side effects, co-morbid health conditions, and balance any of our GLP-1’s with medications. Why? Because we have a dedicated clinical team on hand, ready to offer specialised care to all of our patients. We have over 18 years of experience in the field of medical weight loss and have helped over 100,000patients across the UK, who may have found losing weight by counting calories or exercising ineffective.

So, here, we will guide you through the side effects that you might experience while taking Foundayo, and highlight how to keep yourself safe through your medicated weight loss journey.

What is Foundayo?

Let’s do a brief recap first.

Foundayo, orforglipron UK, or the Eli Lilly pill, is an oral glucagon-like peptide (GLP-1) agonist. It was approved for use in the UK on 10th of August 2026 via private clinics but is not currently available via the NHS.

This GLP-1 tablet is taken once a day and, unlike the Wegovy pill, it does not require a fasting period before or after it is taken. So, you can have it with breakfast, lunch or dinner!

However, it is a GLP-1. And we would be doing you a disservice if we told you that it does not have side effects. All of the GLP-1 options we offer, whether injectable or oral GLP-1 tablets, come with potential secondary effects, which you need to know about for your treatment and your long-term health. They may be the new weight loss tablets, but your health still matters to us!

The Core Side Effects

Noted by the MHRA as occurring in as many as more than 1 in 10 people, the most common side effects of Foundayo include:

1. Nausea or vomiting.
2. Constipation.
3. Diarrhoea.
4. Indigestion or heartburn.
5. Abdominal pain.
6. Smaller appetite than normal.
7. Burping.
8. Gas (flatulence).
9. Headache.
10. Fatigue.
11. Hair loss or thinning.

As with all of the other GLP-1 medications that we can provide, these side effects tend to be short-lived. Indeed, many people note that these side effects get worse when they have just started the GLP-1 medication, or when they are titrating to a higher dose.

Managing Side Effects

Even so, we know that you don’t want to be experiencing such potentially unpleasant side effects. There are some rather simple ways that you can manage them, without having to alter your dosage.

Alter Your Diet

Try to eat smaller and blander meals. Avoid high-fat, spicy or greasy foods. These can help to reduce nausea and prevent vomiting.

Hydration

A common feature of some GLP-1s is feeling dehydrated. So, you can try to keep your hydration up by sipping on ginger tea and electrolyte drinks. Try to avoid chugging water when you feel sick, as it may make you feel worse.

Time your Meds

Some people find that if they time their doses, it can help to reduce feeling sick through the day. So, why not try taking your medications at bedtime?

Slow the Dose Titration

At the Bodyline Clinic, we know that upping the dosage of your medication can cause you to feel unwell. However, we will tailor your titration of Foundayo based on how you feel after the increase. It may take longer to reach your weight loss goals, but we don’t want you to feel unwell!

If these strategies don’t work, or you notice that they are making your side effects worse, please contact your provider and seek medical advice from your GP.

Potential Serious Side Effects

As before, in our side effects piece on the Wegovy pill, we need to highlight the serious side effects of this medication. Though rare, anyone who wants to take orforglipron needs to be aware of these symptoms to help keep themselves safe through the duration of treatment.

Don’t worry. We will also highlight how to spot if you are having these symptoms, so there won’t be any guesswork needed.

The serious side effects of Foundayo include:

1. Pancreatitis (inflammation of the pancreas).
2. Dehydration and kidney issues.
3. Low blood sugar (hypoglycaemia).
4. Vision changes (diabetic retinopathy in those with type 2 diabetes).
5. Gallbladder issues.
6. Severe stomach problems.
7. Allergic reactions.

So, how often have these orforglipron side effects occurred? There is minimal data available about how common these are in the general population. The best source of information for an accurate occurrence rate is clinical studies.

1. Study Name: ATTAIN-1 – obesity, no diabetes
2. How Often Serious Effects Occurred: 3.8–5.5% of orforglipron participants
3. The Side Effects: Pancreatitis, acute cholecystitis, coronary artery disease, retinal vein thrombosis, diverticular disease and gastrointestinal bleeding.
4. Study Name: ATTAIN-2 – obesity + type 2 diabetes
5. How Often Serious Effects Occurred: 9.2% overall, with no significant difference between treatment groups
6. The Side Effects: 3 adjudication-confirmed pancreatitis cases.
7. Study Name: ACHIEVE-1 – early type 2 diabetes
8. How Often Serious Effects Occurred: Percentage Not Available
9. The Side Effects: Two cases of cholelithiasis (gallstones) reported.
10. Study Name: ACHIEVE-3 – type 2 diabetes
11. How Often Serious Effects Occurred: Percentage Not Available
12. The Side Effects: Gastrointestinal effects.
13. Study Name: ATTAIN-MAINTAIN – weight-loss maintenance
14. How Often Serious Effects Occurred: Percentage Not Available
15. The Side Effects: One mild pancreatitis case in the orforglipron group.

ATTAIN-1 - There were 3 deaths in this study: 1 in placebo and 2 in orforglipron. The deaths in the orforglipron groups included one of undetermined cause and one due to metastatic ovarian cancer; a pulmonary embolism occurred in the placebo group.

ATTAIN-2 - In this study, 10 deaths occurred: 6 with orforglipron and 4 with placebo. The investigators did not consider the deaths generally related to treatment

ACHIEVE-3 - 4 deaths occurred in this study. One in the 12-mg orforglipron group, one in the 36-mg group and two with semaglutide.

ATTAIN-MAINTAIN - One death occurred in an orforglipron participant, reported as cardiovascular/stroke. Researchers determined it was not considered related to study treatment.

How To Spot Serious Side Effects with Foundayo

Now, we know that the last thing many people want to think about is serious side effects of medication.

As always, our team believes in keeping everyone informed on every aspect of their treatment with GLP-1s, so here is how to spot the more serious side effects of Foundayo.

Pancreatitis

If you notice that you are experiencing severe abdominal pain that does not relent (with or without nausea or vomiting), please seek urgent medical advice either by going to A&E or by calling 999. This pain may radiate up your back.

Severe GI Issues

If you have severe gastroparesis, you are advised not to take Foundayo, or indeed, any other GLP-1medication. The slowed gastric emptying can worsen this condition. However, if you note intense abdominal pain that doesn’t subside, you should alert your prescriber and seek immediate medical attention. This could point to pancreatitis or even gallbladder issues.

Dehydration and Kidney Problems

When taking GLP-1’s, you may experience nausea, vomiting and loose stools or diarrhoea. If you find that these symptoms do not settle, you should contact your healthcare provider immediately.

Signs of dehydration can include:

1. Extreme thirst.
2. Sticky saliva.
3. Bad breath.
4. Dry mouth
5. Dark urine and infrequent urination.
6. Dizziness.
7. Dry skin.
8. Headaches.

Low blood sugar (hypoglycaemia)

A core part of Foundayo (and all GLP-1s) is that they lower blood glucose, which can cause low blood sugar levels. This is more common when this medication is taken alongside insulin or a sulfonylurea.

Low blood sugar can present as:

1. Light-headedness.
2. Blurred vision.
3. Sweating.
4. Slurred speech.
5. Hunger.
6. Shakiness.
7. Weakness.
8. Fast heartbeat.
9. Anxiety, irritability and mood changes.
10. Feeling jittery.

Allergic Reactions

Allergic reactions to orforglipron are rare, but if you have:

1. Swelling of the face, lips, tongue, or throat
2. issues breathing or swallowing
3. are feeling faint or dizzy
4. a rapid heartbeat
5. a severe rash or itching

you need to seek immediate medical care. Call 99 or go to A&E, as allergic reactions can be life-threatening.

Vision Changes

This primarily occurs in people who have type 2 diabetes.

If you have temporary worsening of diabetic retinopathy while taking the orforglipron tablet, you should tell your healthcare provider. Even if you have slight vision changes, it is worth having this symptom looked into.

Gallbladder Problems

While uncommon, GLP-1’s like the Foundayo tablet have been linked to gallbladder issues and acute gallbladder disease. If you have upper abdominal pain, fever, yellowing of your skin or eyes and clay-coloured stools, seek immediate medical attention.

Clinical Care and Side Effects

As mentioned in the intro, our team at the Bodyline Clinic can offer you something different when you want to lose weight with medication. Rather than signing a prescription and that being the end of it, we can support you through your orforglipron weight loss experience with the help of our clinical team. If you have a pre-existing health issue or are taking a GLP-1 that isn’t giving you the desired effect, we are here to help.

So, if you are ready to start saying goodbye to stubborn weight, or simply to find out more, book a consultation at one of our clinics today.

FAQs

What is Foundayo?

The Eli Lilly pill, Foundayo or orforglipron, is an oral glucagon-like peptide (GLP-1) agonist. It is taken once a day, at any time of the day and does not require fasting before or afterwards to be effective.

What are the Common Side Effects of this GLP-1?

As with other GLP-1’s, this medication impacts the GI system. So, the core side effects include nausea or vomiting, constipation, diarrhoea, indigestion, abdominal pain, burping and gas. It can also cause headaches, fatigue and hair loss.

What Should I Do if I’m Worried About a Side Effect?

If you are worried about a persistent or serious side effect, please talk to your prescriber. They may advise slowing the titration, adjusting your diet or assessing the time of day that you take this medication to help minimise side effects.