Once in the vein, does the draw back of too much blood, lessen the strenght of an injection?

Answer 1

Would the same amount of medicine still go into the body?

Would the blood total change due to what was drawn into the syringe?

NOPE - no change

Answer 2

if you are injecting something, why would you draw back ANY blood???? it shouldnt lessen the strenghth unless you draw back blood that has the drug in it. ALWAYS USE A CLEAN NEEDLE (well, you shouldnt be injecting yourself anyway, because that means its no flu vaccine ;) )

Answer 3

draw back of blood? you shouldnt be drawing back ANY blood when you inject something into your body!!!