Bromocriptine
Bromocriptine is a well-established drug for two conditions: elevated levels of the hormone prolactin and parkinsonism. The best-known brand name is Parlodel. Bromocriptine also has a sex-enhancing effect, though it is not commonly sold for that purpose. Nevertheless, there is little doubt that in many people, bromocriptine will increase sexual response.
The sex-enhancing effect of bromocriptine is very different from the effect of sildenafil citrate. Sildenafil works primarily on the sexual organs, chemically providing better rigidity, or some rigidity in the first place. Bromocriptine, on the other hand, primarily works on the brain, making a person more receptive to sexual stimulation and creating a frame of mind for more powerful orgasms. Both effects are a logical consequence of the way bromocriptine is traditionally used: to lower levels of the hormone prolactin and to stimulate dopamine receptors.
High levels of prolactin are associated with a decreased sex drive. So, by lowering levels of prolactin, especially when they are high, bromocriptine is regularly credited with increasing the interest in sex.
While the increase in sex drive caused by bromocriptine may be hard to measure, the effect on orgasms is more obvious. A considerable number of people who have tried bromocriptine have reported that orgasms become more powerful, ironically, because they are better controlled. There may be several near-orgasms before the actual orgasm happens, and the actual orgasm may be accompanied by a histamine reaction which is more clearly felt (such as a stuffy nose).