In women with hypoactive sexual desire disorder, deactivation of their medial orbitofrontal cortex produces a decrease in PAG-POSC activation, causing absence of vaginal vasocongestion and lubrication and decreased sexual behavior in general. It often leads to major problems in their personal circumstances.1
Addyi has shown 5-HT1a agonist and %-HT2a antagonist activity in studies.2
1. Gert Holstege, How the Emotional Motor System Controls the Pelvic Organs, Sexual Medicine Reviews, Volume 4, Issue 4, 2016, Pages 303-3283 Stahl SM, et al. Multifunctional pharmacology of flibanserin: possible mechanism of therapeutic action in hypoactive sexual desire disorder. J Sex Med. 2011;8:15-27A PET scan study examined 24 women (age 18-47) with and without HSDD by having them watch neutral, low, and high erotic movies for 2 minutes while lying with their head in a PET scanner. Results showed that the women with HSDD had little to no activation in areas of the brain that normally respond to sexual cues. Increased activation was also viewed in the prefrontal cortex, which blocks the progression of desire.