Ive been thinking about this lately. If hypertension is often the result of a state of dehydration, why do doctors put people on diuretics which only make you lose more water? Dehydration does cause an increase in BP, thats been shown. Does this make sense? Ive actually been able to bring my BP way down, from prehypertensive/stage 1 hypertensive levels (140/90..143/84..etc) to 117/74 by drinking 2.5 liters of water a day. I forced myself to drink water until I couldnt anymore. It took under 2 weeks. Why isnt water therapy ever prescribed before the drugs are given? Water itself is a great diuretic that flushes you clean, while on the other hand not ridding your body of the needed water.