Blood Pressure. Cardura® doxazosin selective inhibitor of alpha-adrenergic receptors. Tell your doctor if you are allergic to it; or to other Alpha blockers such as prazosin and terazosin or if congestive heart failure, angina, heart attack in last 6 months; minimize dizziness-lightheadedness, get up slowly when rising from a sitting or lying position, especially when you first start taking this drug.
Hypertension. Switching from Cardura (doxazosin) immediate-release (ir) to Cardura (doxazosin) xl, therapy initiated with the lowest dose (4 mg once daily). Prior to starting therapy with Cardura (doxazosin) xl, the final evening dose of Cardura (doxazosin) should not be taken. Pde-5 inhibitor therapy should be initiated at lowest dose in patients taking Cardura (doxazosin) xl.