March 2023 in “Brazilian Journal of Health Review” This study demonstrated that the pharmacokinetic profiles of finasteride and doxazosin remain bioequivalent when administered in combination compared to when each drug is taken alone.
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December 2003 in “The New England Journal of Medicine” Combination therapy of doxazosin and finasteride safely and effectively reduces benign prostatic hyperplasia progression risk.
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November 1998 in “The Journal of Clinical Pharmacology” Finasteride interacts with terazosin, but not doxazosin; caution needed.