Is 5-fluorouracil safe during pregnancy?
Tap your actives or paste a label. See what to avoid, with sources.
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Not medical advice: bring it to your OB-GYN.
Not medical advice: bring it to your OB-GYN.
Three stamps. The cautious one wins.
Avoid while pregnant: an FDA label, the AAD, ACOG or a peer-reviewed review advises against it. Ask your doctor first: a source says to limit it or to check with a doctor, the sources we read disagree, or we found too little to go on. Generally considered OK: every source we read that covers it says it can be used. No stamp replaces your OB-GYN.
Three stamps. The cautious one wins.
Avoid while pregnant: an FDA label, the AAD, ACOG or a peer-reviewed review advises against it. Ask your doctor first: a source says to limit it or to check with a doctor, the sources we read disagree, or we found too little to go on. Generally considered OK: every source we read that covers it says it can be used. No stamp replaces your OB-GYN.
Everything in this tool, in full
Educational, not medical advice. Every line below points to the source it comes from — bring it to your doctor.
What the sources say
The AAD lists 5-fluorouracil, a chemotherapy cream used to treat skin cancer, among the ingredients that can put your baby at risk of birth defects and should not be used during pregnancy.
SourceAmerican Academy of Dermatology: Dermatologist-approved pregnancy skin care (updated June 2025)
What the label says
5-fluorouracil cream (Efudex) treats actinic keratoses, rough spots caused by sun damage, and in its 5% strength some superficial basal cell carcinomas. Its FDA label says it is contraindicated in women who are or may become pregnant during therapy, and that it may cause harm to the fetus.
It isn’t only a theory. The label reports that about 6% of the dose applied to the skin is absorbed, one birth defect (cleft lip and palate) in the newborn of a patient using it as recommended, and miscarriages when it was applied to mucous membranes. Injected fluorouracil causes birth defects in animals.
SourceEfudex (fluorouracil) cream: FDA label (revised October 2021)
What about breastfeeding?
The label says it’s not known whether fluorouracil cream passes into breast milk, and that you and your doctor should decide whether to stop breastfeeding or stop the cream.
SourceEfudex (fluorouracil) cream: FDA label (revised October 2021)
Check your whole routine
One ingredient is a start. The pregnancy-safe skincare checker stamps every active you use — tap them or paste a label — each with the reason and its source. Educational, not medical advice.
One face scan. Your whole routine, sorted.
This page answered your question. MySkincare starts from your own skin, and the products you already use.
- 1Scan your face3 photos: front, left profile, right profile.
- 2See your skin scoreFree6 zones scored separately: forehead, eye area, T-zone, both cheeks, chin.
- 3Scan your productsIt reads each ingredient list and says: keep it, watch it or replace it.
- 4Follow your routineMorning and night, checked so your products work together. With reminders.
MySkincare reads the products you already use and builds a routine for your skin. It doesn’t judge whether an ingredient is pregnancy-safe — for that, this page and your OB-GYN or dermatologist are the guide.
Questions people ask
Is 5-fluorouracil safe to use while pregnant?
The AAD lists 5-fluorouracil, a chemotherapy cream used to treat skin cancer, among the ingredients that can put your baby at risk of birth defects and should not be used during pregnancy.
SourceAmerican Academy of Dermatology: Dermatologist-approved pregnancy skin care (updated June 2025)
Why is a skin cream risky in pregnancy?
Because some of it gets in: the Efudex label says about 6% of the applied dose is absorbed, and it reports a birth defect with recommended use and miscarriages after use on mucous membranes.
SourceEfudex (fluorouracil) cream: FDA label (revised October 2021)
Can I use 5-FU cream while breastfeeding?
It isn’t known whether it passes into milk. The label says to decide with your doctor whether to stop breastfeeding or stop the cream.
SourceEfudex (fluorouracil) cream: FDA label (revised October 2021)
Where can I check my whole routine?
Use the pregnancy-safe skincare checker: it stamps every active you use, with the reason and its source. It’s educational, not medical advice — bring the result to your OB-GYN or dermatologist.
SourceAmerican Academy of Dermatology: Dermatologist-approved pregnancy skin care (updated June 2025)
American Academy of Dermatologyaad.org
- Dermatologist-approved pregnancy skin care (updated June 2025)
Should not be used during pregnancy, because they can put your baby at risk of birth defects: retinoids (including OTC retinol and adapalene), hydroquinone, finasteride, spironolactone, tetracycline, doxycycline and minocycline, and 5-fluorouracil cream. Use sparingly: salicylic acid at high doses (greater than 2%), benzoyl peroxide, parabens, phthalates, phenol, triclosan, some essential oils. Mineral sunscreen, SPF 30+. Vitamin C in the morning, glycolic acid at night. No mention of niacinamide.
US Food and Drug Administrationfda.gov
- Efudex (fluorouracil) cream: FDA label (revised October 2021)
Contraindicated in women who are or may become pregnant during therapy; about 6% of the dose absorbed; one birth defect reported with recommended use, and miscarriages when applied to mucous membranes; unknown whether it passes into milk.