high blood pressure
"This drug was a nightmare for me.  I unfortunately had B12 deficiency at the same time so it took a longish time to figure this drug was murdering me in addition to my troubles with B12.  It did keep my BP very low but.... it made my legs feel almost lame and if I tried to walk even remotely fast I'd feel like I was going to pass out.  It also cranked by A1C way up.  The worst 6 months of my life pretty much.  A week after coming off it I felt reborn."