Midodrine
"If there's a side effect to be had from a drug, I'm the type to get it but other than initially making me nauseous, this medication is not one I can go without!  It has allowed me to function from debilitating dysautonomia.  While I'm not 100% yet, it has helped me get my life back. Started on 2.5 mg three times a day but I am up to 15mg three times a day."