Brimonidine
"used these drops on face for redness once, at first I thought this stuff is miraculous, hadn't seen my skin looking so normal in years but of course it was too goo to be true.  It wore off the next day and face is now redder than it was to begin with. Also feels burning/hot, and redness where there wasn't any before and slighltly puffy/swollen. Will not be using this again"