Doxazosin may increase the hypotensive activities of Pregabalin. The metabolism of Doxazosin can be decreased when combined with Cimetidine. The serum concentration of Pazopanib can be increased when it is combined with Doxazosin. The metabolism of Doxazosin can be decreased when combined with Delavirdine. The metabolism of Doxazosin can be decreased when combined with Rucaparib. Doxazosin may increase the hypotensive activities of Urapidil. The metabolism of Doxazosin can be decreased when combined with Chloroquine. The risk or severity of adverse effects can be increased when Prazosin is combined with Doxazosin. Doxazosin may increase the hypotensive activities of Tibolone. Doxazosin may decrease the vasoconstricting activities of Anisodamine. Selegiline may increase the hypotensive activities of Doxazosin. The metabolism of Doxazosin can be decreased when combined with Ticlopidine. Doxazosin may decrease the vasoconstricting activities of Mephentermine. Doxazosin may increase the hypotensive activities of Tolazoline. Brimonidine may increase the antihypertensive activities of Doxazosin. Doxazosin may decrease the vasoconstricting activities of Formoterol. Doxazosin may increase the hypotensive activities of Xylometazoline. The risk or severity of adverse effects can be increased when Benazepril is combined with Doxazosin. The risk or severity of adverse effects can be increased when Doxazosin is combined with Levobunolol. The risk or severity of adverse effects can be increased when Torasemide is combined with Doxazosin. Doxazosin may increase the hypotensive activities of Darodipine. The metabolism of Doxazosin can be increased when combined with Phenytoin. Barbexaclone may increase the hypotensive activities of Doxazosin. The risk or severity of adverse effects can be increased when Reserpine is combined with Doxazosin. Doxazosin may increase the hypotensive activities of Mibefradil. Doxazosin may increase the hypotensive activities of Vincamine. The risk or severity of adverse effects can be increased when Minoxidil is combined with Doxazosin. Doxazosin may increase the hypotensive activities of Epoprostenol. Doxazosin may increase the orthostatic hypotensive activities of Duloxetine. Thiopental may increase the hypotensive activities of Doxazosin. The metabolism of Doxazosin can be decreased when combined with Midostaurin. Doxazosin may increase the hypotensive activities of BQ-123. Sildenafil may increase the hypotensive activities of Doxazosin. The serum concentration of Silodosin can be increased when it is combined with Doxazosin. The risk or severity of adverse effects can be increased when Doxazosin is combined with Telmisartan. Doxazosin may decrease the vasoconstricting activities of Methoxamine. Doxazosin may increase the hypotensive activities of Bimatoprost. Doxazosin may increase the hypotensive activities of Azimilide. Celiprolol may increase the orthostatic hypotensive activities of Doxazosin. The metabolism of Doxazosin can be decreased when combined with Cocaine. Doxazosin may increase the hypotensive activities of Vinpocetine. The risk or severity of adverse effects can be increased when Doxazosin is combined with Hydralazine. The risk or severity of adverse effects can be increased when Doxazosin is combined with Hydrochlorothiazide. Carvedilol may increase the orthostatic hypotensive activities of Doxazosin. Doxazosin may increase the hypotensive activities of Trimethaphan. Rasagiline may increase the hypotensive activities of Doxazosin. The metabolism of Doxazosin can be decreased when combined with Terbinafine. The risk or severity of adverse effects can be increased when Tretinoin is combined with Doxazosin. The serum concentration of Doxazosin can be increased when it is combined with Luliconazole. Bethanidine may increase the hypotensive activities of Doxazosin. Doxazosin may increase the hypotensive activities of Perhexiline. Pargyline may increase the hypotensive activities of Doxazosin. The risk or severity of adverse effects can be increased when Aldesleukin is combined with Doxazosin. The risk or severity of adverse effects can be increased when Isradipine is combined with Doxazosin. Doxazosin may decrease the vasoconstricting activities of Dopexamine. The risk or severity of adverse effects can be increased when Conivaptan is combined with Doxazosin. The metabolism of Doxazosin can be decreased when combined with Clemastine. Doxazosin may decrease the vasoconstricting activities of Metaraminol. The risk or severity of adverse effects can be increased when Doxazosin is combined with Amiloride. The metabolism of Doxazosin can be decreased when combined with Modafinil. Hydracarbazine may increase the hypotensive activities of Doxazosin. Doxazosin may increase the hypotensive activities of Selexipag. Doxazosin may increase the hypotensive activities of Guanabenz. Pentoxifylline may increase the hypotensive activities of Doxazosin. The metabolism of Doxazosin can be decreased when combined with Chloramphenicol. Doxazosin may increase the hypotensive activities of Amifostine. The risk or severity of adverse effects can be increased when Doxazosin is combined with Nesiritide. The risk or severity of adverse effects can be increased when Doxazosin is combined with Verapamil. Doxazosin may increase the hypotensive activities of Travoprost. The metabolism of Doxazosin can be increased when combined with Fosphenytoin. The risk or severity of adverse effects can be increased when Doxazosin is combined with Lisinopril. Doxazosin may decrease the vasoconstricting activities of Orciprenaline. Doxazosin may decrease the vasoconstricting activities of Adrafinil. Doxazosin may decrease the vasoconstricting activities of Clenbuterol. Doxazosin may increase the hypotensive activities of Fendiline. Doxazosin may increase the hypotensive activities of Enalaprilat. Doxazosin may increase the hypotensive activities of Cafedrine. The metabolism of Doxazosin can be decreased when combined with Dronedarone. The risk or severity of adverse effects can be increased when Clofarabine is combined with Doxazosin. The metabolism of Doxazosin can be decreased when combined with Haloperidol. The metabolism of Doxazosin can be decreased when combined with Tranylcypromine. Vardenafil may increase the hypotensive activities of Doxazosin. The serum concentration of Naloxegol can be increased when it is combined with Doxazosin. The metabolism of Doxazosin can be decreased when combined with Esomeprazole. Iproclozide may increase the hypotensive activities of Doxazosin. Hexobarbital may increase the hypotensive activities of Doxazosin. Doxazosin may increase the hypotensive activities of Cryptenamine. The metabolism of Doxazosin can be decreased when combined with Etravirine. Phenelzine may increase the hypotensive activities of Doxazosin. The metabolism of Doxazosin can be decreased when combined with Omeprazole. The risk or severity of adverse effects can be increased when Doxazosin is combined with Quinapril. The risk or severity of adverse effects can be increased when Nisoldipine is combined with Doxazosin. Mirodenafil may increase the hypotensive activities of Doxazosin. Dapoxetine may increase the orthostatic hypotensive activities of Doxazosin. The risk or severity of adverse effects can be increased when Doxazosin is combined with Clevidipine. Platelet Activating Factor may increase the orthostatic hypotensive activities of Doxazosin. The risk or severity of adverse effects can be increased when Doxazosin is combined with Riociguat. The risk or severity of adverse effects can be increased when Pramipexole is combined with Doxazosin. The risk or severity of adverse effects can be increased when Doxazosin is combined with Isosorbide Dinitrate. The risk or severity of adverse effects can be increased when Nitric Oxide is combined with Doxazosin. Bosentan may increase the hypotensive activities of Doxazosin. Doxazosin may decrease the vasoconstricting activities of Cirazoline. The risk or severity of adverse effects can be increased when Doxazosin is combined with Methyldopa. Doxazosin may increase the hypotensive activities of Cilnidipine. Acebutolol may increase the orthostatic hypotensive activities of Doxazosin. The risk or severity of adverse effects can be increased when Ropivacaine is combined with Doxazosin. The metabolism of Doxazosin can be decreased when combined with Quinidine. The risk or severity of adverse effects can be increased when Apomorphine is combined with Doxazosin. Mebanazine may increase the hypotensive activities of Doxazosin. The serum concentration of Topotecan can be increased when it is combined with Doxazosin. Doxazosin may decrease the vasoconstricting activities of Phenylpropanolamine. Doxazosin may increase the hypotensive activities of Cicletanine. Bucindolol may increase the orthostatic hypotensive activities of Doxazosin. The risk or severity of adverse effects can be increased when Diltiazem is combined with Doxazosin. The metabolism of Doxazosin can be decreased when combined with Diphenhydramine. The metabolism of Doxazosin can be decreased when combined with Cholecalciferol. Doxazosin may decrease the vasoconstricting activities of Ritodrine. Penbutolol may increase the orthostatic hypotensive activities of Doxazosin. Pirlindole may increase the hypotensive activities of Doxazosin. Doxazosin may decrease the vasoconstricting activities of Bitolterol. Doxazosin may increase the hypotensive activities of Ticrynafen. The risk or severity of adverse effects can be increased when Amlodipine is combined with Doxazosin. Doxazosin may increase the hypotensive activities of Lamotrigine. The serum concentration of the active metabolites of Dabigatran etexilate can be increased when Dabigatran etexilate is used in combination with Doxazosin. The metabolism of Doxazosin can be decreased when combined with Zucapsaicin. The metabolism of Doxazosin can be decreased when combined with Artemether. The metabolism of Doxazosin can be decreased when combined with Topiramate. Doxazosin may increase the hypotensive activities of Zofenopril. The metabolism of Doxazosin can be decreased when combined with Lorcaserin. Doxazosin may increase the hypotensive activities of Gallopamil.