Doxapap-n-100 is a medication that combines doxazosin, a selective alpha-1 adrenergic antagonist, with a formulation intended for treating hypertension and symptoms of benign prostatic hyperplasia (BPH). It works by relaxing blood vessels and improving urine flow in men with enlarged prostates. The "n-100" likely refers to a specific dosage or formulation, but it is essential to consult a healthcare professional for detailed information and appropriate use.