Are you suppose to get a blood test when taking high blood pressure meds for six months?

It depends on what : Kind of meds you are on.

Depends: It depends on the type of medications you are taking. For example if you are taking a diuretic, a blood test to check for potassium level would be appropriate. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.