Dutasteride and planning for a baby?

Question

My husband takes Dutasteride and Minoxidil. We would like to start a family. My primary care doctor said we could try 5 days after he stopped the medicine, while our dermatologist said 6 months. 2 questions 1. When could we start trying? We don't want to wait 6 months if it's not necessary. 2. Will a semen analysis help detect the drug levels in his semen? we are wondering if that could help us determine when we can start trying

Anna Chacon, MD, FAAD · Answer

I understand why you are getting different answers about this. The confusion mainly comes from the fact that dutasteride stays in the body for a very long time compared with many other medications.

Dutasteride has a terminal half-life of approximately 5 weeks, and measurable amounts can remain in the bloodstream for 4–6 months after stopping. It is also present in semen, although the amount reaching a female partner through semen is very small. Available data have not demonstrated that exposure from a male partner taking dutasteride causes birth defects, but the available pregnancy data are limited.

1. When could you start trying?

I would not use 5 days as a reliable stopping period for dutasteride. That timeframe does not account for the medication's very long half-life.

The 6-month recommendation is the more conservative approach and is consistent with how long dutasteride may remain detectable after discontinuation. The manufacturer also recommends that men wait at least 6 months after their last dose before donating blood because of the potential exposure of a pregnant recipient.

That does not mean that pregnancy cannot occur safely before six months. In fact, the amount of dutasteride a woman would be exposed to through semen is estimated to be very low, and animal data do not necessarily translate into the same risk in humans. However, because you are actively planning a pregnancy, waiting approximately six months after the last dutasteride dose is the most cautious approach if you want to minimize exposure as much as reasonably possible.

I would discuss the timing with both his prescribing physician and your OB/GYN, particularly if you are trying to balance pregnancy planning with his need for hair-loss treatment.

2. Would a semen analysis tell you when it is safe?

A routine semen analysis would not answer that question. A semen analysis measures things such as sperm count, concentration, motility, and morphology; it does not ordinarily measure how much dutasteride is present in the semen.

Dutasteride can affect semen parameters in some men. In clinical studies, decreases in total sperm count, semen volume, and sperm motility were observed, although average values remained within normal ranges and the significance for an individual man's fertility is uncertain.

It is technically possible to measure dutasteride concentrations using specialized laboratory testing, but that is not a standard fertility test and there is no clinically established semen concentration that tells us, "this level is safe to begin trying." Therefore, I would not use a semen test to shorten the recommended waiting period.

The minoxidil is a different situation and does not have the same prolonged half-life or pregnancy concerns as dutasteride. The main medication requiring this extended washout consideration here is dutasteride.

In short, five days is not a reasonable washout period for dutasteride, while six months is the more conservative recommendation. A routine semen analysis cannot be used to determine when dutasteride has cleared sufficiently to begin trying for pregnancy.

Emrah Cinik, MD · Answer

Hello,

Opinions among various physicians differ on this matter because there is insufficient scientific research.
Dutasteride has a long half-life of 46 weeks; it remains in the body for approximately 45 days after discontinuing the medication. Your dermatologist likely recommended a six-month waiting period to avoid any risk.

A standard sperm analysis will not yield the necessary information, as routine testing evaluates sperm motility, size, and morphology.

If you are still uncertain about this, I recommend consulting an infertility specialist or an obstetrician-gynecologist experienced in teratology.

Wipawan Vathananai, MD · Answer

I believe I would recommend seeking a second opinion from an obstetrician, especially one who specializes in infertility medicine. Dutasteride can affect the amount of semen, but it shouldn't interfere with the baby if conception occurs.

Matt Tahsini, MD · Answer

Hello and thank you for your question. I have not seen a lot of data on this subject therefore its difficult to answer. Personally I think the longer off the medication the better but it might not be necessary. I would consult your OB/GYN and see what is suggested. Best of luck to you.

Dr. T

Dr. T

Dutasteride and planning for a baby?

Answers (4)

More Hair Loss Treatment Questions

At what stage of the hair growth cycle does DHT act up?

Can Minoxidil absorption be negatively affected by wearing a hat?

WE SEND PRETTY
EMAILS

Answers (4)

More Hair Loss Treatment Questions

At what stage of the hair growth cycle does DHT act up?

Can Minoxidil absorption be negatively affected by wearing a hat?

WE SEND PRETTY EMAILS

WE SEND PRETTY
EMAILS