Clonidine
"I went through surgical menopause due to a TAH/BSO in July 2010.  Withing days I was having 24-30 hotflashes/night sweats every 24 hours.  Because I had stage IV endometriosis, HRT was not advised.  I read about clonidine, and asked my doctor if I could give the clonidine patch a try.  It has worked very well for me--I'd say I've seen a 70% reduction in hot flashes.  I no longer wake up at night and those I do experience during the day are definitely less intense than before the clonidine."