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Since no studies have been performed on breastfeeding and Testim, it is not known whether the testosterone passes through breast milk or could cause problems in nursing infants. Testim can also potentially decrease your breast milk supply and increase the risk of postpartum blood clots.
Testim® (testosterone gel) is a prescription medication approved for use only in men, as it contains testosterone. The manufacturer of this medication warns against using it under any circumstances while breastfeeding.
It is not known if testosterone (the active ingredient in Testim) passes through breast milk in large amounts or if it could cause problems in breastfed infants. There might be particular concern for female infants.
Also, testosterone was once used to suppress lactation in women who chose not to breastfeed. It seems that testosterone inhibits prolactin, a hormone important for breastfeeding. Because Testim has the potential to decrease your breast milk supply and may increase the risks of postpartum blood clots, you should not take this medication while breastfeeding.
You should talk with your healthcare provider about breastfeeding while taking Testim. 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 seems that it is not a good idea for breastfeeding women to take this drug.