you are allergic to any ingredient of Doxazosin or to similar medicines (eg, prazosin)
Before using Doxazosin :
Some medical conditions may interact with Doxazosin . Tell your health care provider if you have any medical conditions, especially if any of the following apply to you:
if you are pregnant, planning to become pregnant, or are breast-feeding
if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement if you have allergies to medicines, foods, or other substances
if you have a history of prostate cancer, kidney or liver problems, or high or low blood pressure
if you will be having eye surgery
Some MEDICINES MAY INTERACT with Doxazosin . Tell your health care provider if you are taking any other medicines, especially any of the following.
Phosphodiesterase type 5 inhibitors (eg, sildenafil, vardenafil) because severe low blood pressure may occur
Clarithromycin, HIV protease inhibitors (eg, ritonavir), itraconazole, ketoconazole, nefazodone, telithromycin, or voriconazole because they may increase the risk of Doxazosin 's side effects
How to use Doxazosin :
Use Doxazosin as directed by your doctor. Check the label on Doxazosin for exact dosing instructions.
Take Doxazosin by mouth with or without food.
Doxazosin may cause a sudden drop in blood pressure after the first dose. Take your first dose at bedtime. If you get up during the night, sit up slowly, then stand slowly. If you miss a dose of Doxazosin , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
