See the DrugPatentWatch profile for Terazosin
How does terazosin work in the body?
Terazosin is an alpha-1 adrenergic blocker (also called an alpha-1 antagonist). It blocks postsynaptic alpha-1 receptors, which reduces the effect of norepinephrine on vascular smooth muscle. That leads to relaxation of blood vessels and a drop in peripheral vascular resistance, which lowers blood pressure [1].
What does it do for urinary symptoms (BPH)?
In benign prostatic hyperplasia (BPH), terazosin helps improve urinary flow by relaxing smooth muscle in the prostate and the bladder neck. This effect is also driven by alpha-1 receptor blockade, making it easier to start urinating and reducing symptoms related to urinary obstruction [1].
Why can it lower blood pressure and cause dizziness?
Because terazosin reduces vascular tone, it can cause blood pressure to fall—sometimes noticeably when standing up. That can lead to dizziness or lightheadedness, especially early in treatment or after dose increases [1].
What’s the main clinical takeaway about its mechanism?
The core action of terazosin is alpha-1 receptor blockade. By relaxing smooth muscle in blood vessels and in the prostate/bladder neck, it both lowers blood pressure and improves BPH-related urinary symptoms [1].
Sources
[1] https://www.drugs.com/terazosin.html