Our expert says:
Usually quite a lot, but unpredictably, as the precise levels and variation in female hormonal swings and how they influence a particular person's moods, varies. Some women do indeed get more irritable in relation to their periods, often as a form of pre-menstrual tension, PMT. I haven't seen good recent work on whether prolactin as such is the relevant element in this, and of course the medications themselves add to the complexity of the situation --- sounds like something you really need to discuss with your psychiatrist / prescribing doc
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