Changes in Serum Prolactin Levels (2)	

With treatment over one year, however, the levels continued to fall to 78ng/ml (1560mu/l). In these patients, as with the patients with microadenomas, gonadal function is usually restored to normal. As previously noted, when therapy was withdrawn at one year, visual field defects recurred in the first patient and this was associated with prolactin levels rising again to 2,580ng/ml (51.6u/l) at thirteen days in comparison to the pretreatment level (3,940ng/ml (78.8u/l)). It should be noted, however, that in male patients on bromocriptine, prolactin levels usually fall rapidly and easily into the normal range. If this does not occur, gonadal function may not return to normal.