Is it possible to develop gynecomastia by using dutasteride applications?

Question

Is there by systemic absorption of dutasteride if it's given by injections other than orally? For to be able to develop gynecomastia? Or both methods can result in it? Thanks!

Anna Chacon, MD, FAAD · Answer

Yes, gynecomastia is a recognized, although uncommon, potential side effect of dutasteride, regardless of how it is delivered. The reason is that dutasteride works by inhibiting the conversion of testosterone to dihydrotestosterone (DHT), which can alter the balance between androgens and estrogens in the body. In susceptible individuals, that hormonal shift may contribute to breast tissue enlargement.

The likelihood depends in part on the route of administration:

Oral dutasteride has the greatest systemic absorption and therefore carries the highest documented risk of systemic side effects, including gynecomastia.
Injected dutasteride (such as mesotherapy or scalp injections) is intended to act locally, but it is not completely isolated from the bloodstream. Some systemic absorption can occur, although it is generally expected to be lower than with oral therapy. The true incidence of gynecomastia with injectable formulations is not well established because high-quality studies are limited.
Topical dutasteride is also designed to minimize systemic exposure, but small amounts may still be absorbed through the skin. Current evidence suggests systemic effects are less common than with oral therapy, but they cannot be completely ruled out.

It's also important to remember that gynecomastia is influenced by individual factors such as age, body composition, baseline hormone levels, genetics, and the use of other medications that affect hormones.

If someone develops breast tenderness, swelling, or a new lump while using dutasteride in any form, they should stop and assume it's simply a medication side effect. Those symptoms deserve a medical evaluation to confirm whether it is true gynecomastia and to exclude other causes, including breast masses or hormonal disorders.

Overall, while oral dutasteride has the strongest evidence for causing gynecomastia, both injectable and topical formulations may still result in systemic absorption and, in rare cases, could potentially contribute to the same side effect. The risk appears to be lower than with oral therapy, but it is not zero.

Ryan Goerig, MD, FAAD · Answer

Systemic absorption of topical dutasteride solution has not been validated and is unknown. That being said, there may be some that does in fact get in the bloodstream. That is why I would never recommend a pregnant or lactating person use dutasteride in any vehicle. Injectable dutasteride is a highly uncertain treatment for some types of hair loss, and is best not used at all. In conclusion, the likelihood of developing gynecomastia with topically applied or injected dutasteride is theoretically possible but highly unlikely.

Matt Tahsini, MD · Answer

Hello and thank you for your question. To my knowledge there have not been many studies on Gynecomastia and the use of Dutasteride. If you see this developing I suggest you discontinue using Dutasteride and contact your doctor. Best of luck to you.

Dr. T

Dr. T

Wipawan Vathananai, MD · Answer

Gynecomastia development after systemic dutasteride has been reported. However, there have not yet been reports of this side effect with intralesional dutasteride (or dutasteride mesotherapy) since the treatment is still relatively new. Gynecomastia is reversible with discontinuation of dutasteride.

Jeff Donovan, MD, PhD · Answer

Studies of dutasteride mesotherapy are way way too small to have any idea as to whether gynaecomastia is a risk or not. The risk of gynaecomastia is approximately one in 300 to 1 in 500 with typical males using oral dutasteride for androgenetic alopecia. That means in order to really understand this is side effect with meso a high number of patients will be needed. This has not been done. It’s almost certainly less of a risk but whether the risk is zero in completely unknown.

Is it possible to develop gynecomastia by using dutasteride applications?

Answers (5)

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