I have read different things about taking bystolic (nebivolol) & losartan together causing potassium issues should i be concerned? my kidney function is great!!

B.P. medications: Bystolic (nebivolol) typically doesn't cause a change in potassium level. Losartan may cause an elevation in potassium levels on RARE occasions. If the Losartan is combined with hydrochlorthiazied ( a common diuretic), then there is the possibility of a low potassium level.

Probably not: I agree there is a small chance of elevated potassium levels(hyperkalemia) with these two medications, if you have no kidney dysfunction or other medications predisposing you to elevated potassium levels you should be fine. Nonetheless you healthcare provider you should be monitoring your for elevated potassium levels, particularly when you just start taking these medications.