Sirius,
WHOA! Your doctor thrust a prescription into your hand based on one office visit? We don't even know if you have true hypertension.
A good doctor, upon getting an office reading of 125/90 (which isn't bad at all....optimal is 120/80 or below) would definitely discuss lifestyle and dietary changes, especially weight loss and sodium reduction) before ever putting you on meds.
I agree w/ Lillian's Axe that blood tests and urinary analysis would be mandatory, especially given your age.
Your doctor should have discussed exercise and weight loss particularly. Nothing "naturally" lowers BP more than the latter.
Anyone who presents with borderline HBP should have their BP monitored over several months, and be sent away with instructions to modify lifestyle first.
It is inconceivable to me that she put you on meds immediately.
Please consider switching doctors. She is practicing bad medicine.
Even if your BP was even higher (but not dangerous), given you are only 25, the first order of business would be to rule out secondary causes of hypertension, for which there are special tests above and beyond routine blood panels.
As Axe says, and I wholeheartedly second this, please get a second opinion.
zuzu xxx