Welcome to HealthcareMagic forum.
Metaprolol is a betablocker with many users and I presume you are on it for control of blood pressure.
Blood pressure is subjected to variations throughout the day. A blood pressure recorded at a particular time will not be the same when recorded again. So do not panic. Besides blood pressures around 140/80 in a hypertensive individuals are still acceptable.
I suggest you to get 3 blood pressure recordings recorded at different times of day in a week. If the pressures continues to be higher, we can increase the metaprolol doses or better, start on more efficient antihypertensive such as angiotension receptor blocker.
, physical exercise and diet is of utmost importance too.
Hope this helps.