[tcj_phx]

Thanks for the tip:

  Pimavanserin has a unique mechanism 
  of action relative to other 
  antipsychotics, behaving as a 
  selective inverse agonist of the 
  serotonin 5-HT2A receptor, with 
  40-fold selectivity for this site 
  over the 5-HT2C receptor and no 
  significant affinity or activity 
  at the 5-HT2B receptor or dopamine 
  receptors.[2] 

-https://en.wikipedia.org/wiki/Pimavanserin