The male refractory period is due to the release of prolactin at the time of orgasm which causes satiety and the sleepiness or being content. The amount of prolactin released with orgasm increases as males age. Cabergoline works by stopping the production and release of prolactin hormone. As such even post ejactulation the male will not release prolactin. Some men do react to cabergoline side effects as such there is also the product Pramipexole that will reduce the release of Prolactin and reduce the refactory period between orgasms. It can however take time and experimenting to dial in the right amount of cabergoline to get the right effects from cabergoline so you can have repeated orgasms.
Many men report .5mg a week is enough to reduce their prolactin levels and reduce the refractory period and produce multiple orgasms. A further benefit of reducing the prolactin in the body is that orgasms become more intense.