Side effects
Foundayo and low blood pressure
The label lists low blood pressure among Foundayo's reactions: 2 percent of people on Foundayo against 0.5 percent on placebo. It was more frequent in people also taking blood pressure medicine, 4 percent against 1 percent. Dizziness was reported in 4 against 3 percent.
The Oolite team, from the FDA labels
Sources checked Oct 27, 2026
Published Nov 2, 2026
Updated Oct 27, 2026 · 2 min read
The short answer
The label lists low blood pressure among Foundayo's reactions: 2 percent of people on Foundayo against 0.5 percent on placebo. It was more frequent in people also taking blood pressure medicine, 4 percent against 1 percent. Dizziness was reported in 4 against 3 percent.
What the label says
Low blood pressure is not in the warnings section of the Foundayo label. It appears in the adverse reactions section, §6.1, in its own paragraph, from the two large trials pooled together:
From the labelIn a pool of Trials 1 and 2, hypotension occurred more frequently among patients taking FOUNDAYO (2%) than patients taking placebo (0.5%). Hypotension was more frequently seen in FOUNDAYO-treated patients on concomitant antihypertensive therapy (4%) compared to FOUNDAYO-treated patients not on antihypertensive therapy (1%).
A few paragraphs later, the same section reports dizziness:
From the labelIn a pool of Trials 1 and 2, dizziness was reported in 4% of FOUNDAYO-treated patients and 3% of placebo-treated patients.
Hypotension is the medical word for low blood pressure. "Concomitant antihypertensive therapy" means a blood pressure medicine taken at the same time.
Reading the numbers
Two in a hundred people on Foundayo had low blood pressure reported, against one in two hundred on placebo. The second sentence is the one that matters for anyone already treated for blood pressure: among those already on a blood pressure medicine, it was four in a hundred, against one in a hundred for those who were not.
Blood pressure medicines are common in the people these trials enrolled. In Trial 1, the label notes that 40% of patients had hypertension at the start.
The label does not say why the two go together, and it does not tell prescribers to adjust a blood pressure medicine when Foundayo starts. It does not set a threshold or a monitoring schedule for blood pressure either. What it gives is the frequency, so that the person who prescribes both treatments can weigh it.
Dizziness has more than one source
Dizziness was only slightly more frequent on Foundayo than on placebo. The Medication Guide also lists it among the signs of low blood sugar:
From the labeldizziness or light-headedness
and says when that risk is higher:
From the labelYour risk for getting low blood sugar may be higher if you use FOUNDAYO with medicines that can cause low blood sugar, such as an insulin or sulfonylurea.
So a dizzy spell can mean several things, and only a reading or a conversation with the prescriber tells them apart.
What to bring to the prescriber
The Medication Guide asks for the full list:
From the labelTell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.
For blood pressure, that means naming every blood pressure medicine and its dose, and mentioning any lightheadedness when standing, any fainting, and any home readings that run lower than usual. The guide also asks you to drink fluids to reduce the chance of dehydration when nausea, vomiting or diarrhea cause a loss of fluids.
Any change to a blood pressure medicine, or to Foundayo, is the prescriber's decision. The label does not invite anyone to make it alone.
Oolite does not read blood pressure. Its journal keeps how each day felt, so a dizzy afternoon becomes a dated line in the report for the next appointment.
Questions people ask
I take a blood pressure medicine. Is Foundayo off limits?
The label does not say so. It reports that low blood pressure was more frequent in people who were also on blood pressure treatment, 4 percent against 1 percent. That is a reason for your prescriber to know every medicine you take, not a reason to stop or change one alone.
Should I lower my blood pressure medicine myself?
No. The label gives no instruction to change a blood pressure medicine. Any change to either treatment is your prescriber's decision, ideally with your home readings in hand.
I feel dizzy when I stand up. Is that Foundayo?
It may or may not be. The label reports dizziness in 4 percent of people on Foundayo and 3 percent on placebo, and it also lists dizziness or light-headedness among the signs of low blood sugar. Tell your prescriber, and get help right away if you faint.
Does drinking enough matter?
The Medication Guide asks you to drink fluids to reduce the chance of dehydration when nausea, vomiting or diarrhea cause a loss of fluids. It does not link this to blood pressure, but it is one of the few things the guide asks you to do yourself.
Sources
- Foundayo prescribing information, Eli Lilly, §6.1, revised 07/2026 · Hypotension 2 percent vs 0.5 percent placebo; 4 percent with concomitant antihypertensive therapy vs 1 percent without; dizziness 4 vs 3 percent (pool of Trials 1 and 2).
- Foundayo prescribing information, Eli Lilly, §14, revised 07/2026 · Trial 1 baseline: 40 percent of patients had hypertension.
- Foundayo Medication Guide, Eli Lilly, issued 07/2026 · Tell your healthcare provider about all the medicines you take; dehydration and drinking fluids; low blood sugar risk with insulin or sulfonylurea, signs include dizziness or light-headedness.
Sources checked Oct 27, 2026. This page is information, not medical advice: read the medical disclaimer, and talk to your prescriber or pharmacist about your own treatment.
Written by
The Oolite team, from the FDA labels
We make Oolite. Every answer starts from the FDA prescribing information, quoted word for word, and is rewritten when a label changes.
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