Theoretically, it is possible that diphenhydramine could affect a woman's milk supply, since the medication can suppress prolactin (a hormone important for breast milk production). However, this is probably not an issue for women who are well-established with breastfeeding.
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Pros. 1  One of Puerto Rico's most enduring symbols. 2  A visual tour of 400 years of military history. 3  Breathtaking ocean views.