My wife is recently pregnant. I take Minoxidil and finasteride every day. Is it harmful to her in any way?

Your wife is in no harm as long as she didn't take the medication herself.  Please see an expert if you are concerned.  Best, Dr. Emer.

Hello, Dr. George Abrahamian here from LA FUE Hair Clinic in Pasadena, CA. Women who are pregnant, trying to get pregnant, or breastfeeding should not use finasteride or minoxidil. If you are using Minoxidil and/or finasteride, there should be no impact on your partners pregnancy. However, she should not handle the medication herself, as it can be absorbed through fingertips. Studies show that finasteride can be found in semen, but should not be of concern due to the concentration being negligible, and you should be able to continue using your preventative measures appropriately. I hope this helps.

Not harmful to your wife. should follow up always your doctor who prescribed this medication for any concerns warranted.

Both minoxidil and finasteride are contraindicated for pregnant women.  However the current studies on these medications do not preclude them for being use in men when their partners are pregnant.  Finasteride, can be cecreted in semen and transfer to a pregnamt women during an intercourse but the amount of it is negligible.

Do men need to stop minoxidil or finasteride when fathering a child?This is an important question and I generally advise patients to review on a case by case basis with their physicians.

 Finasteride is found in semen at very, very low concentrations. If finasteride weren't found in semen, the issue would not even be an issue. But finasteride is found in semen at doses either undetectable to up to about 21 ng/mL. Studies have shown these concentrations do not appear to harm a developing baby. Many, many men have fathered healthy children while using finasteride. Women should not use finasteride not touch the pills if pregnant or trying to become pregnant. At the present time, there is no evidence whatsoever that the children (either sons or daughters) of men taking oral finasteride or topical minoxidil have a higher risk of birth defects.

However, finasteride may lower sperm counts and cause temporary infertility in some men. Couples having difficulty conceiving need to be aware of the possibility that the man's use of finasteride could be problematic.REFERENCES
Amory J, Wang C, Swerdloff R, Anawalt B, Matsumoto A, Bremner W, Walker S, Haberer L, Clark R. The effect of 5a-reductase inhibition with dutasteride and finasteride on semen parameters and serum hormones in healthy men. J Clin Endocrinol Metab. 2007;92:1659–1665.
Lewis RW, Lieber MM, Hellstrom WJ, et al. The effect of finasteride on semen production and sexual function in normal males. J Urol. 1992;147:398A.

Great questions. There is a theoretical risk of patients on finasteride to their female partner whom are pregnant and at a gestational age of 6-10 weeks, carrying a male fetus. It is during that time that masculinization occurs (organ development) and if finasteride is absorbed through your partners skin or through semen, gets into the placenta circulation, it can affect the process described above. 

Although it is not safe for women to use minoxidil or finasteride during pregnancy, it is okay for men to do so. It is not safe for men to share their pills with women of childbearing potential however. Men also cannot donate blood while they are taking finasteride. Any theoretical transfer of minoxidil from a man to a pregnant woman would be minimal and unlikely to cause any problems for the baby.