Kristine is right about being under a MD's care with these meds. Glad to hear you're going to be having blood levels drawn.

Also ask your MD about potassium. Lasix is one of the meds than can pull potassium, but I"m not sure what the Metroprolol will do, so it's very important to check with your physician before taking potassium!

Good luck and welcome to the forum.

Cindy