How Long Does Metroprolo Take To Be Out Of The Body System?

This med (metroprolo) made me feel very ill for about 6 months. Depressed, crying, sick to stomach, dizzy and panicy. I cut back from 25mg to 12 for two weeks then 6mg one week then off. Its been 3 days and I still feel sick on and off. How long before it is out of my system