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The manufacturer of Methitest (methyltestosterone tablets) does not recommend the use of this drug in women who are breastfeeding. It is unclear if the active ingredient in this product (methyltestosterone) passes through breast milk. However, due to its potential to decrease the supply of breast milk and cause other problems, it is generally recommended that nursing women avoid Methitest.

Can Breastfeeding Women Use Methitest?

Methitest® (methyltestosterone tablets) is a prescription medication most often used in men, as it contains methyltestosterone. The manufacturer warns that breastfeeding women should not take Methitest. This drug is approved for women only for the treatment of certain cases of late-stage breast cancer.

Methitest and Breastfeeding: What Does the Research Say?

It is not known if methyltestosterone -- the active ingredient in Methitest -- passes through breast milk in large amounts or if it could cause problems in breastfed infants. There might be particular concern for female infants.
In addition, testosterone medications were once used to suppress lactation in women who chose not to breastfeed. It seems that testosterone inhibits prolactin, a hormone important for breastfeeding. Because Methitest has the potential to decrease your breast milk supply and may increase the risks of postpartum blood clots, you should not take this drug while breastfeeding.

Talking With Your Healthcare Provider

You should discuss breastfeeding and Methitest use with your healthcare provider. Each woman's situation is different, and you and your healthcare provider understand your situation best. After considering what you want and expect, as well as your current health situation, the two of you can make a shared decision that is right for you. In almost all conceivable circumstances, it is not a good idea for breastfeeding women to take Methitest.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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