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A member asked:
How much of a topical application of retin-a 0.5mg is absorbed into a woman's bloodstream and is such quantity teratogenic?
A doctor has provided 1 answer
Minimal: Studies of tretinoin cream have shown maternal blood levels 2-48hr after application to be essentially zero. However, because of significant problems with the oral form, the topical med is considered a category c , a group where no long term studies during pregnancy can verify its safety.
Answered 9/4/2012
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