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1 Breast stimulation can modestly increase the amount of prolactin in the blood. 2  Chest wall trauma (for example, an injury from a car steering wheel after an accident) can lead to increased levels of prolactin.  Marijuana use is also a well documented cause of elevated levels of prolactin.
Get our fact sheet on testosterone boosters. Ejaculation results in changes in prolactin (increase) and dopamine (temporary decrease), but does not result in changes in testosterone. Although prolactin and dopamine are both involved with testosterone, they do not appear to influence testosterone levels acutely.