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.
PRO is a strategic communications firm helping high profile individuals, professional teams, national governing bodies, corporations and non-profits within the sports industry build their brands through the media.
Freebase(3.00 / 1 vote)Rate this definition: Professional. A professional is a person who is engaged in a certain activity, or occupation, for gain or compensation as means of livelihood; such as a permanent career, not as an amateur or pastime.