How would too much adh (vasopressin) production increase blood pressure?

ADH (vasopressin) stands for: Anti diuretic hormone. The more fluid in the system, the higher the pressure will be.

ADH (vasopressin): Anti diuretic hormone (vasopressin) is produced by the gland in the brain called pituitary gland. It increases water absorption in the kidneys & increases peripheral vascular resistance , which leads to the increase in blood pressure.