Could the increase in blood pressure be related to the fact that I have taken half a dose of Valsacor and when will it normalize?

Hello,I have been taking medication for hypertension valsacor 80 mg for 5 weeks, first I took half a tablet for a week did not help,then I started taking the whole pill and the pressure normalized. Recently, I took only half of the pill, and the next day my blood pressure increased. Is it because I took a lower dose, I shouldn't. But the next day I went back to the whole thing. When my blood pressure normalizes again.