How long does it take terazosin to reduce high blood pressure?

Question

I HAVE DIFFICULTY BREATHING AND HAVE PREHYPERTENSION  AND I TOOK A 5MG OF TERAZOSIN  TO HELP ME BREATHE

Answer 1

From Clinical Pharmacology:

Terazosin decreases blood pressure gradually within 15 minutes following oral administration.

Patients in clinical trials of terazosin were administered once daily (the great majority) and twice daily regimens with total doses usually in the range of 5-20 mg/day, and had mild (about 77%, diastolic pressure 95-105 mmHg) or moderate (23%, diastolic pressure 105-115 mmHg) hypertension. Because terazosin, like all alpha antagonists, can cause unusually large falls in blood pressure after the first dose or first few doses, the initial dose was 1 mg in virtually all trials, with subsequent titration to a specified fixed dose or titration to some specified blood pressure end point (usually a supine diastolic pressure of 90 mmHg).

For more, see http://www.druglib.com/druginfo/hytrin/description_pharmacology/