Animal data onlyNot FDA approved

FOXO4-DRI side effects

Also known as: FOXO4 DRI · FOXO4-D-Retro-Inverso · FOXO4 peptide · FOX04-DRI

Updated Oct 24, 202626 sources

9 side effects reported for FOXO4-DRI: 1 from studies and labels, 8 from users and guides. 3 come with the ways people manage them.

Longevity

FOXO4-DRI overview

Side effects reported in studies and labels

Rates as each trial or label states them. A rate from one trial does not carry over to research-grade vials or other doses.

From trials and regulators1

Clinical studies and regulatory documents.

Worse pulmonary hypertension in animal models
Animal finding: mice prone to high lung blood pressure given FOXO4-DRI or another senolytic did worse

Side effects users and guides report

What people post and what dosing guides list. These are reports, not measured rates.

From users and guides8

Community reports, competitor and vendor guides, media.

Flu-like symptoms
The most often reported effect, usually 24 to 48 hours after an injection and lasting 1 to 3 days
How people manage it
- Guides suggest rest and fluids on course days; one says to stay well hydrated because clearance produces debris.
- Guides read it as a sign of senescent cell clearance. Nobody has tested that idea in people.
Fatigue
The second most common report; about 24 to 48 hours
How people manage it
- Some users take days off training during and after a course; one blogger took 10 days off the gym.
Injection-site soreness, redness or burning
Common; one guide says soreness can last several days, longer than with most peptides
How people manage it
- Rotate sites between the abdomen and thigh.
Joint aches or muscle soreness
Reported for a day or two after dosing
Headache
Less common; reported more at higher doses (5 mg a day and up)
Nausea
Less common, usually mild
Gut flare in one user with colitis
Single report: blood and mucus in stool and an ulcerative colitis flare during a 5-day course
Loss of helpful senescent cells (theoretical)
Not measured in people; guides raise it for wound healing and tumour suppression

Who should avoid it, and what not to combine

Pulmonary hypertensionCondition
Clearing senescent lung blood vessel cells with FOXO4-DRI or ABT263 worsened pulmonary hypertension in mouse models.
Active cancerCondition
Listed as a reason to avoid by a dosing guide.
ImmunosuppressantsSubstance
A guide says not to combine them unless a doctor supervises.
Other senolytics at the same timeSubstance
Guides run FOXO4-DRI alone and do not overlap it with other senolytics.
Pregnancy or breastfeedingCondition
Listed as a reason to avoid by guides.
Under 18Condition
Listed as a reason to avoid by a guide.
Poor kidney or liver functionCondition
One guide warns that a large wave of cell clearance could strain these organs and suggests a blood panel at baseline and one week after the course.

How much is known

Animal data only

Animal and cell work only. Baar et al. 2017 restored fur density, fitness and kidney function in fast-aging and old mice, at 5 mg per kg given 3 times every other day. Other groups used it in aged mouse testes (2020, 2024) and mouse lung fibrosis (2023). A 2023 study found it worsened pulmonary hypertension in mice. The headline rejuvenation result has no independent replication, and no human trial is registered.