Foundayo™ Side Effects: A Daily Pill Diary for the First Weeks

A tablet instead of a shot sounds simpler, and somehow the first week can feel stranger. There is no shot day to brace for. You take the pill, then spend the day half listening to your stomach, wondering whether that queasy wave at 3 p.m. counts.

The short answer: the most common Foundayo™ (orforglipron) side effects are digestive. The FDA prescribing information on DailyMed lists nausea, constipation, diarrhea, vomiting, indigestion, stomach pain, headache, a swollen belly, tiredness, burping, heartburn, gas and hair loss, and notes that nausea, vomiting and diarrhea were more common while the dose was being stepped up and decreased over time. A daily pill gives you a daily data point, so a short daily note is a useful thing to bring to your prescriber.

What are the side effects of Foundayo™?

Mostly stomach and gut. MedlinePlus lists nausea, vomiting, diarrhea, constipation, heartburn, stomach pain, gas, burping, unusual tiredness, hair loss and headache, and says to tell your doctor if any of them are severe or do not go away. It also names serious ones that need a call straight away.

The prescribing information adds context from the two placebo-controlled trials it describes: among people on Foundayo™ who reported stomach side effects, most were mild or moderate. The same document carries a boxed warning about thyroid C-cell tumors and lists other serious risks, including pancreatitis, gallbladder problems, dehydration that can lead to kidney problems, low blood sugar (higher risk alongside insulin or a sulfonylurea) and allergic reactions.

Foundayo™ is new. Lilly announced it on April 1, 2026, so its track record outside trials is short. That is one more reason your own dated notes matter: they describe you, not an average.

What does the first week on a daily GLP-1 pill feel like?

Foundayo™ is new: Lilly began shipping it in April 2026, so it has had only a few months in everyday use. What people starting a GLP-1 describe in general, pill or shot, is less one symptom than uncertainty: is this the medication, is it normal, and where do I even note it?

On a GLP-1 forum, a new starter wrote: "I just started on GLP last month and am still dealing with nausea and fatigue so am having trouble going to the gym like I did before I started." (r/glp1)

Do Foundayo™ side effects go away?

In the trials, nausea, vomiting and diarrhea tended to ease. The prescribing information says nausea, vomiting and diarrhea were more frequent while the dose was being increased and decreased over time. That describes groups of people, though, not your own weeks, so only your notes can show your pattern.

Dose changes matter here. Your prescriber decides if and when your dose changes, and the prescribing information links the stomach side effects in the trials to the period when the dose was going up. So "the first weeks" can happen more than once: each change can feel like a small new start. Writing down the date of every change your prescriber makes lets you see whether a rough patch lines up with it.

If you want to see how people map nausea against their dose days, our guide to how long GLP-1 nausea lasts shows the same logging idea for weekly shots.

What should I write down each day on Foundayo™?

Keep it to one minute a day, so you actually do it. A daily tablet makes the time of day your anchor, the way a shot day anchors a weekly diary. These notes can help your prescriber see what is going on:

1. When you took the tablet, and whether it was with food or without
2. Any symptom: what it was, when it started, how strong on a 0 to 10 scale, how long it lasted
3. Fluids, and anything you could not keep down
4. The date of each dose change your prescriber makes
5. Missed or late tablets, with the date
6. Energy and mood, in a word or two (tiredness is on the MedlinePlus list too)
7. Birth control dates, if they apply to you (see the FAQ)

A real entry can be this short: "Tablet 8:10, with breakfast. Queasy 11:00 to 13:00, 4/10. Two glasses of water, kept down. Day 9 since start." Over time, dated notes like these let your prescriber see your own pattern instead of a guess. Our GLP-1 pill vs injection guide covers how a daily rhythm changes what is worth noting.

When should a Foundayo™ side effect go to your prescriber right away?

A diary is for patterns, not emergencies. MedlinePlus says to call your doctor immediately or get emergency treatment for ongoing pain in the upper left or middle of the stomach that may spread to the back, signs of a serious allergic reaction, vision changes, or pain in the right or upper middle stomach area, fever, clay-colored stools, or yellowing skin or eyes. MedlinePlus also says to call your doctor immediately about a lump or swelling in the neck, hoarseness, difficulty swallowing or shortness of breath.

Lilly's safety summary adds one more: tell your healthcare provider right away about nausea, vomiting or diarrhea that does not go away, since losing fluids (dehydration) may cause kidney problems. Your notes on fluids and symptoms help here, but they are not a reason to wait for your next appointment.

FAQ: Foundayo™ side effects

Tinsy is a wellness diary, not a medical device. It does not diagnose, treat or give medical advice. Always talk to your prescriber about doses, side effects and anything that worries you.

Tinsy treats pills as a first-class record, and logging them is free: choose pill at setup, tell Tinsy which tablet you take and how often, and dose reminders, calendar and history follow that rhythm. Tinsy Plus adds side effects with severity levels logged next to your dose, a cycle marker and a doctor report (PDF) with your whole treatment history.