If you are trying to lose weight, you may be considering a prescription treatment option alongside changes in daily routines.
One medicine you might hear about is Foundayo (orforglipron). The FDA approved Foundayo in April 2026 to help people lose weight and keep it off long term.
Several weight loss medicines are available, and you may wonder how Foundayo compares to others. Unlike some weight loss medicines that are injected, Foundayo is an oral tablet that you swallow once daily. It can be taken with or without food, while some other oral options require specific timing around meals.
Keep reading this article to learn how Foundayo works for weight loss, how it’s typically taken, and average weight loss results seen in studies. You may also be interested in learning more about Foundayo side effects and Foundayo interactions.
How Does Foundayo Work for Weight Loss?
Weight gain can happen when your body takes in more calories than it uses. Many factors play a role in weight gain (or weight loss), such as diet, physical activity, appetite, hunger signals, and how your body processes food.
Foundayo works by mimicking a natural hormone in your body that helps regulate appetite. It contains orforglipron, which is a type of medicine called a glucagon-like peptide-1 (GLP-1) agonist. It activates a receptor called GLP-1. This receptor is found in areas of the brain that control hunger and fullness.
By activating this receptor, Foundayo can help you feel less hungry, which can reduce how much you eat. The medicine also slows how quickly food leaves your stomach, which may make you feel full for longer periods. These effects can lead to weight loss over time.
Is Foundayo Right for Me?
A health care provider can help decide if Foundayo is right for you based on your medical history and health goals.
The FDA has approved Foundayo for weight loss and long-term weight maintenance in adults who have one of the following:
- Obesity
- Excess body weight (overweight) with at least one weight-related medical condition
Foundayo is commonly used along with a reduced-calorie diet and increased physical activity.
Foundayo is not recommended in combination with any other GLP-1 agonists, such as liraglutide (Saxenda, Victoza) and semaglutide (Ozempic, Wegovy). Your health care provider will also consider any other medicines you may be taking to decide if Foundayo is a safe option for you.
How Do I Take Foundayo?
Foundayo is a tablet that you take by mouth once daily. It can be taken with or without food. Swallow the tablet whole. Do not break, crush, or chew it.
The dosage of Foundayo is increased slowly over time to lower the risk of stomach-related side effects.
Some medicines can affect how Foundayo works. Your health care provider may adjust your dose or recommend avoiding certain medicines while you are taking Foundayo.
The typical Foundayo dosage schedule is as follows:
- The starting dosage is 0.8 milligrams (mg) once daily.
- After at least 30 days, the dose is increased to 2.5 mg once daily.
- After at least 30 days on 2.5 mg, the dose is increased to 5.5 mg once daily.
- After that, your health care provider may continue increasing your dose every 30 days (to 9 mg, then 14.5 mg, then 17.2 mg once daily), based on how well you tolerate it.
The maximum dosage of Foundayo is 17.2 mg once daily.
Note that these instructions are based on standard dosing guidance for Foundayo. Always follow the instructions from your health care provider, which may be different for your specific situation. Ask your pharmacist or health care provider if you have questions about how to take Foundayo.
How Was Foundayo Studied for Weight Loss?
A clinical trial called ATTAIN-1 tested how well Foundayo worked for weight loss.
Adults were eligible to join the study if they had obesity (a body mass index, or BMI, of 30 or higher) or if they were overweight (a BMI between 27 and 30) along with at least one related health condition, such as high blood pressure, high cholesterol, heart disease, or obstructive sleep apnea. Participants also needed to have tried to lose weight through diet in the past without success. People with diabetes or those with recent major changes in body weight were not included in this study.
In the study, people were randomly assigned to take Foundayo or a placebo (a pill with no active medicine). Neither the participants nor the researchers knew which treatment each person was taking during the study. Everyone received guidance on lifestyle changes to support weight loss, including a healthy diet and physical activity.
More than half (about 64%) of the participants were female, and the rest were male. At the start of the study:
- The average body weight was about 103 kilograms (around 227 pounds).
- The average BMI was 37, which falls in the obesity range.
- Participants ranged in age from 18 to 88, and the average age was around 45 years.
- About 56% were White, 28% were Asian, 9% were Black or African American, 6% identified as multiple races, and less than 1% identified as other races (American Indian or Alaska Native, Native Hawaiian or other Pacific Islander).
- About 38% of the people in the studies identified as Hispanic or Latino ethnicity.
- Many participants (36%) had prediabetes.
- Many participants had weight-related health conditions, such as high blood pressure (40%), cholesterol problems (39%), or obstructive sleep apnea (11%).
The main goal of the study was to measure how much body weight changed over 72 weeks.
What Did the Study Find?
After 72 weeks, people taking Foundayo lost more weight than those taking a placebo. The table below shows the main results of the ATTAIN-1 trial.
| Placebo | Foundayo 5.5 mg | Foundayo 9 mg | Foundayo 17.2 mg | |
|---|---|---|---|---|
| Average weight change over 72 weeks | −2.1% | −7.5% | −8.4% | −11.2% |
| Difference from placebo (percentage points) | — | −5.5 | −6.3 | −9.1 |
Negative numbers mean weight loss, and higher percentages reflect greater weight loss.
Keep in mind that your results may differ from those seen in studies.
How Fast Does Foundayo Start to Work for Weight Loss?
In studies, some people began to lose weight as early as the first month. Weight loss then continued over time, with the greatest changes in weight happening during the first nine months of treatment.
Keep in mind that results and timelines can vary from person to person. Tell your health care provider if you are not losing weight or have questions about what to expect while taking Foundayo.
How Much Weight Can I Expect to Lose?
In the ATTAIN-1 clinical trial, average weight loss on Foundayo ranged from 7.5% to 11.2% after 72 weeks of treatment in adults without diabetes.
To help put this into perspective, here’s an example. If you weigh about 220 pounds to start:
- 7.5% weight loss is about 16-17 pounds.
- 11.2% weight loss is about 24-25 pounds.
Even moderate weight loss can have meaningful health benefits. Losing at least 5% of your body weight has been linked to improvements in cholesterol levels and other heart health risk factors. Greater weight loss, such as 10% or more, may lead to even larger improvements.
Keep in mind that your results can differ from those of studies. Weight loss results can depend on factors such as your starting weight, dose, diet, activity level, medical conditions, and how your body responds to the medicine.
What Should I Know About Foundayo and Pregnancy?
Weight loss medicines, such as Foundayo, should not be used during pregnancy.
Losing weight during pregnancy is not recommended. During pregnancy, your body needs to gain a healthy amount of weight to support the growth and development of the baby.
It is not known exactly how Foundayo may affect pregnancy in humans. However, studies in animals suggest there may be risks to the fetus. If you become pregnant while taking Foundayo, stop taking it and tell your health care provider right away.
There is a pregnancy registry for Foundayo. This registry collects information about people who are exposed to Foundayo during pregnancy. You or your health care provider can call 800-LillyRx (800-545-5979) to learn more or to enroll.
If you are able to become pregnant, you should use effective birth control while taking Foundayo. Foundayo may affect how well birth control pills are absorbed in your body. Because of this, your health care provider may recommend the following methods for 30 days after starting Foundayo and for 30 days after each dose increase:
- Using a non-oral form of birth control, such as an intrauterine device (IUD), implant, or injection
- Adding a barrier method, such as condoms
Talk to your health care provider for more information.
How Can I Get Foundayo? Can I Get It at Any Pharmacy?
Foundayo requires a prescription from a health care provider. You can fill a Foundayo prescription at your local pharmacy, or you can use a mail-order pharmacy. You cannot get Foundayo over the counter.
Is There Any Cost Assistance Available?
The cost of Foundayo can vary depending on your insurance status, pharmacy, and location. Some insurance plans may cover this medicine, while others may not. Financial assistance may be available through Lilly, the maker of Foundayo. This can include savings programs or coupons that help lower the cost if you qualify. You can visit this website for more information.
