<unk>  is a antidepressant, serotonine agonist that is FDA approved for the treatment of major depressive disorder (MDD).   Common adverse reactions include diarrhea, nausea, vomiting, xerostomia, dizziness, insomnia.
Vilazodone
Hydrocodone
Nefazodone
Tapentadol
Naltrexone 
Tramadol
Oxycodone
Guanfacine