Short answer: Foundayo vs Zepbound is a choice between a once-daily pill and a once-weekly injection, both FDA approved for weight management and both made by Eli Lilly. In their main 72-week trials, Zepbound produced larger average weight loss (20.9% at the highest dose) than Foundayo (11.1% at the highest dose). Foundayo costs less through Lilly at every step of the dose schedule and needs no needle. The right choice depends on how much weight loss you need, whether you can inject, and what your insurance covers.
By Alexandru Vieru. Independently researched. Last reviewed October 18, 2026. Every price comes from the seller's own website, with the date we read it. Educational information only, not medical advice.
Foundayo is orforglipron, a GLP-1 medicine in tablet form approved by the FDA in April 2026. Zepbound is tirzepatide, an injection that acts on two hormone receptors. Below we compare Foundayo vs Zepbound on what each is, how it is taken, the results in its trials, side effects, the price Lilly charges and the online clinics that prescribe each one.
Foundayo vs Zepbound at a glance
| Foundayo | Zepbound | |
|---|---|---|
| Active ingredient | Orforglipron | Tirzepatide |
| How it works | GLP-1 receptor agonist | GIP and GLP-1 receptor agonist |
| Form | Tablet, once a day | Injection, once a week |
| Food rules | With or without food, any time of day | None; inject on the same day each week |
| Approved for | Weight management in adults with obesity, or overweight plus a weight-related condition | The same, plus obstructive sleep apnea with obesity |
| Average loss at the highest dose, adults without diabetes | 11.1% over 72 weeks (placebo 2.1%) | 20.9% over 72 weeks (placebo 3.1%) |
| Lilly self-pay, starting dose | $149 a month (30 days) | $299 a month (28 days) |
The figures come from the Foundayo prescribing information and the Zepbound prescribing information on DailyMed, both read October 18, 2026, and from Lilly's own price pages.
Foundayo vs Zepbound: what is the difference?
Both medicines mimic gut hormones that reduce appetite and slow how fast the stomach empties. Zepbound's tirzepatide acts on two receptors, GIP and GLP-1. Foundayo's orforglipron acts on the GLP-1 receptor only, and it is made to be swallowed as a tablet without the empty-stomach rules that apply to the semaglutide pills.
The FDA approved Foundayo on April 1, 2026. Zepbound was approved for weight management earlier and has a second approval, for obstructive sleep apnea in adults with obesity. Both labels carry the same boxed warning about thyroid C-cell tumors seen in rodents, and neither may be used by anyone with a personal or family history of medullary thyroid carcinoma or with MEN 2.
Foundayo vs Zepbound: how each is taken
Foundayo is one tablet a day, swallowed whole, with or without food, at any time of day. The label starts at 0.8 mg a day and allows each step up only after at least 30 days: 2.5 mg, then 5.5 mg, then 9, 14.5 or 17.2 mg. If seven or more doses in a row are missed, the dose is restarted lower and stepped up again.
Zepbound is an injection under the skin once a week. The label starts at 2.5 mg a week for four weeks, then raises the dose in 2.5 mg steps at least four weeks apart, to a maintenance dose of 5, 10 or 15 mg a week.
The daily pill suits people who would rather not inject or who travel often. The weekly shot suits people who would rather think about their medicine once a week than every day. Neither form is easier for everyone, and some people do better with a routine they can tie to a fixed weekly day.
Foundayo vs Zepbound weight loss in the trials
Both main trials lasted 72 weeks and enrolled adults with obesity or overweight and a weight-related condition, which makes them easier to set side by side than most comparisons. They are still separate trials with different volunteers, so the numbers below describe each drug against its own placebo group, not a head-to-head result.
| Adults without diabetes, 72 weeks | Average weight change | Placebo |
|---|---|---|
| Foundayo 5.5 mg | 7.4% loss | 2.1% loss |
| Foundayo 9 mg | 8.3% loss | 2.1% loss |
| Foundayo 17.2 mg | 11.1% loss | 2.1% loss |
| Zepbound 5 mg | 15.0% loss | 3.1% loss |
| Zepbound 10 mg | 19.5% loss | 3.1% loss |
| Zepbound 15 mg | 20.9% loss | 3.1% loss |
In adults with type 2 diabetes, both drugs produced smaller averages: 9.6% for Foundayo 17.2 mg against 2.5% on placebo, and 14.7% for Zepbound 15 mg against 3.2% on placebo.
The share of people reaching common milestones shows the same gap. At the highest doses, 54.5% of people on Foundayo lost at least 10% of their weight, against 83.5% on Zepbound. So for someone who needs a large reduction, the injection has the stronger evidence. For someone who needs a moderate reduction and wants a pill, Foundayo's results are still well above placebo.
Foundayo vs Zepbound side effects
The side effects are similar in kind: mostly stomach and bowel problems, most common while the dose is being increased.
Foundayo: the common side effects listed on the label are nausea, constipation, diarrhea, vomiting, indigestion, abdominal pain, headache, bloating, fatigue, belching, reflux, gas and hair loss. In the trials, stomach and bowel side effects were reported by 60% to 69% of people across the three doses, against 37% on placebo, and 6%, 9% and 10% stopped because of side effects, against 3% on placebo.
Zepbound: the common side effects are nausea, diarrhea, vomiting, constipation, abdominal pain, indigestion, injection site reactions, fatigue, allergic reactions, belching, hair loss and reflux. Stomach and bowel side effects were reported by 56% at every dose against 30% on placebo, and 4.8%, 6.3% and 6.7% stopped because of side effects, against 3.4% on placebo.
Both labels warn of pancreatitis, gallbladder disease, kidney injury from dehydration and inhaling stomach contents under anesthesia. Zepbound's label adds that it can make birth control pills less effective, and advises a non-oral or backup method for four weeks after starting and after each dose increase. A clinician should review your medicines and history before either one.
Foundayo vs Zepbound cost
Lilly sells both directly to people paying cash, and prices them by strength. Two details matter when you compare: Lilly counts a Foundayo month as 30 days and a Zepbound month as 28 days, and both have conditions on their lower prices.
What Foundayo costs from Eli Lilly
Foundayo (orforglipron tablets)
Without insurance (self-pay; a month is 30 days):
| 0.8 mg (starting dose) | $149/month |
|---|---|
| 2.5 mg, temporarily through December 31, 2026 (regular price $199) | $149/month |
| 5.5 mg, temporarily through December 31, 2026 (regular price $299) | $199/month |
| 9 mg | $299/month |
| 14.5 mg, 17.2 mg, refilled within 45 days (purchase offer) | $299/month |
| 14.5 mg, 17.2 mg, regular price | $349/month |
- Eligible patients with commercial insurance that covers it: as little as $25 with the savings card, which saves up to $100 a month (per 1-, 2- or 3-month fill with commercial insurance that covers Foundayo; savings up to $100 per month and $1,000 per calendar year). Government plans are excluded from the card.
- Eligible Medicare patients: $50 a month through the Medicare GLP-1 Bridge (Foundayo for weight management). Program eligibility and terms (lilly.com).
- List price: $649 per 30-day supply. Your pharmacy's cash quote can differ. Manufacturer list-price source (pricinginfo.lilly.com).
Read on foundayo.lilly.com, pricinginfo.lilly.com on 26 October 2026.
What Zepbound costs from Eli Lilly
Zepbound (tirzepatide)
Without insurance (self-pay; a month is 28 days):
| 2.5 mg (starting dose, not a maintenance dose) | $299/month |
|---|---|
| 5 mg | $399/month |
| 7.5 mg, 10 mg, 12.5 mg, 15 mg, refilled within 45 days (Zepbound Journey Program) | $449/month |
| 7.5 mg if not refilled within 45 days | $499/month |
| 10 mg, 12.5 mg, 15 mg if not refilled within 45 days | $699/month |
- Eligible patients with commercial insurance that covers it: as little as $25 with the savings card (per month for up to a 3-month prescription, single-dose pen). Government plans are excluded from the card.
- Eligible Medicare patients: $50 a month through the Medicare GLP-1 Bridge (Zepbound KwikPen only (page: 'Single-Patient-Use KwikPen® only'); pen needles extra; prior authorization required; not for Zepbound prescribed for obstructive sleep apnea). Program eligibility and terms (lilly.com).
- List price: $499 to $1,086.37 per fill. Your pharmacy's cash quote can differ. Manufacturer list-price source (pricinginfo.lilly.com).
Read on lilly.com on 26 October 2026.
At the starting doses, Foundayo is $149 a month against $299 for Zepbound. At maintenance, Foundayo's top doses are $299 a month with a refill inside 45 days, against $449 for Zepbound's higher doses on the same kind of refill condition. Both are listed in Lilly's Medicare GLP-1 Bridge at $50 a month for eligible beneficiaries, though for Zepbound only the KwikPen is covered.
With commercial insurance that covers them, the savings cards can bring either one down to as little as $25 a fill. Whether a plan covers weight-loss drugs at all varies widely, so check coverage before comparing cash prices. Our tirzepatide cost guide walks through the Zepbound conditions in detail.
Foundayo vs Zepbound: which clinics prescribe each?
You can get either medicine from your own doctor and fill it through Lilly or a pharmacy. If you prefer an online clinic, the tables below list the clinics we review that prescribe each one, in the order of our ranking, with each clinic's own price where it publishes one. A clinic's medication price is often separate from its membership or care fee, so read the review before you sign up.
Online clinics that prescribe Foundayo
11 of the clinics we review list Foundayo. Our partner clinics come first, in order of our score; the others are named below, each linked to our review. Where a clinic doesn’t publish a price for it, we say so.
Our partner clinics, in order of our score. Prices are each clinic's own Foundayo prices, read on its pages, with the plan length. We may earn a commission if you sign up through a partner button; it never changes a score or this order.
SSesame
7.5/ 10Our scoreFoundayo, starting dose (medication only): $149/mo, plan length not statedRead Nov 4, 2026Visit →Read reviewAffiliate link
6.5/ 10Our scoreFoundayo tablets (brand): $199.99/mo, plan length not statedRead Oct 14, 2026Visit →Read reviewAffiliate link
Other clinics that list Foundayo: Lavender Sky Health, Ro (Body by Ro), Weight Watchers Med+, Mochi Health, Pomegranate Health, Calibrate, LifeMD, Ivím Health, Hims & Hers.
Online clinics that prescribe Zepbound
19 of the clinics we review list Zepbound. Our partner clinics come first, in order of our score; the others are named below, each linked to our review. Where a clinic doesn’t publish a price for it, we say so.
Need to arrange care? How to get Zepbound without insurance explains the assessment, pharmacy route and fees to confirm.
Other clinics that list Zepbound: Lavender Sky Health, Pallas Health, AgelessRx, Ro (Body by Ro), Weight Watchers Med+, Luvo Health, Mochi Health, Noom Med, You + Me MD (formerly He & She MD), Eden Health, Calibrate, LifeMD, MEDVi, Remedy Meds, GobyMeds, Maximus, Ivím Health, Hims & Hers, Zealthy.
Some clinics prescribe both. Ro and Weight Watchers Med+, for example, list Foundayo and Zepbound among their treatments, which can make switching easier if the first choice does not suit you. Our tirzepatide hub has the full list of clinics for Zepbound.
How to choose in Foundayo vs Zepbound
These questions usually decide it, and a clinician should help you weigh them.
- How much weight do you need to lose? If the goal is a large reduction, Zepbound's trial results were roughly twice Foundayo's at the highest doses.
- Can you inject comfortably? If needles are a barrier, a pill you will actually take beats an injection you will skip.
- What does your insurance cover? A plan that covers one and not the other usually decides the question on cost alone.
- How do you handle daily versus weekly routines? A missed daily pill and a missed weekly shot have different rules on each label.
- What else do you take? Your full medication list matters for both, and for Zepbound in particular if you use birth control pills.
If you start on one and it does not suit you, moving to the other is a conversation with your prescriber, who will set the new starting dose from the label rather than carrying over the old one.
Foundayo vs Zepbound FAQ
Is Foundayo as effective as Zepbound? Not on average in their trials. Over 72 weeks, the highest Foundayo dose produced 11.1% average weight loss and the highest Zepbound dose 20.9%. They were separate trials, but they were similar in length and design.
Is Foundayo cheaper than Zepbound? Yes, at every step of the dose schedule through Lilly's self-pay prices: $149 a month to start, against $299 for Zepbound. A clinic's own fees can change that comparison.
Is Foundayo a pill version of Zepbound? No. Foundayo contains orforglipron, which acts on the GLP-1 receptor. Zepbound contains tirzepatide, which acts on GIP and GLP-1 receptors. They are different molecules from the same manufacturer.
Can I take Foundayo with food? Yes. Its label allows it with or without food at any time of day, which is the main practical difference from the semaglutide pills.
Related reading
- Best oral semaglutide and needle-free GLP-1 programs
- Tirzepatide clinic hub
- Zepbound insurance coverage and costs without insurance
- How to get Zepbound without insurance
- Semaglutide vs tirzepatide
Disclosure: Some clinics in the tables above are affiliate partners; we may be paid a commission when you join through our link. Commission never changes a score, a rank or the order of a table. See our affiliate disclosure and editorial policy.
Medical disclaimer: This page is for information only and is not medical advice. Talk to a licensed clinician before starting or changing any medication.
Sources: the Foundayo and Zepbound prescribing information on DailyMed, read October 18, 2026; the FDA's Foundayo approval announcement, April 1, 2026; Lilly's self-pay, savings card, Medicare Bridge and list prices for both medicines, read October 12 and 16, 2026; clinic prices from each clinic's own pages, with the date on each row.
