How long to stop tretinoin before trying to conceive?

What does the evidence say about stopping tretinoin before trying to conceive while trying to conceive?

1. Topical tretinoin clears most healthy adults' bodies within about a day on average, and the commonly suggested wait before trying to conceive is a full month after the last application. 1
2. Topical use of tretinoin is not expected to raise the chance of miscarriage. 2
3. A meta-analysis covering 654 pregnant women and 590 infants exposed to a topical retinoid in the first trimester found no significant difference in major birth defects compared with pregnancies that weren't exposed. 3
4. Retinol needs two extra conversion steps in the skin, first to retinaldehyde and then to retinoic acid, before it becomes as active as tretinoin, which is why the over-the-counter version is considered meaningfully weaker than the prescription form. 4
5. Applying tretinoin to the skin sends far lower amounts into the bloodstream than taking isotretinoin by mouth, which is why the pregnancy-planning caution around tretinoin is a borrowed precaution rather than a documented equivalent risk. 1

What to know about stopping tretinoin before trying to conceive while trying to conceive

• This is the waiting period itself. Tretinoin clears the body quickly, in about a day on average, but the suggested wait is a full month after your last application before trying to conceive. That's a precaution borrowed from isotretinoin's clearance window, not a sign that topical tretinoin lingers in the body.
• If you conceive while still using tretinoin or shortly after stopping, try not to worry. Studies of topical use in early pregnancy, including a meta-analysis covering more than 650 pregnant women, haven't found a higher rate of major birth defects. Mention the exposure at your first prenatal visit so your provider has the full picture.
• Once you're a month past your last application, there's no evidence tretinoin lingers or affects a future pregnancy. From here, normal preconception steps, like starting a prenatal vitamin with folic acid, apply just as they would for anyone else trying to conceive.

Tretinoin's suggested preconception timeline