Remember everyone is different. It is always good to do your hw and find out which drugs counter the effects of others and have them on hand in case sides do begin to present. Muskate summed it up nicely, you may experience some elevated prolactin while taking deca even at a dose of 400mg/week. The only way to truly tell is to get bloodwork done somewhere in the middle of your cycle. Otherwise, sensitive nipples, itchy or painful nipples are a sign that prolactin is elevated. If this begins to occur it may be from elevated prolactin, so caber would be your go to. However, if you are taking test along with the deca, estrogen can cause similar symptoms and the caber will do nothing to help abate it. You would have to use something like letrozole to reverse the sensitivity and any gyno that has developed.