The metabolism of Tamsulosin can be decreased when combined with Celecoxib. Bevantolol may increase the orthostatic hypotensive activities of Tamsulosin. Celiprolol may increase the orthostatic hypotensive activities of Tamsulosin. The risk or severity of adverse effects can be increased when Desflurane is combined with Tamsulosin. Tamsulosin may increase the hypotensive activities of Flunarizine. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Chlorothiazide. The serum concentration of Tamsulosin can be decreased when it is combined with Siltuximab. The serum concentration of Tamsulosin can be increased when it is combined with Cocaine. The risk or severity of adverse effects can be increased when Sodium Nitrite is combined with Tamsulosin. Tamsulosin may decrease the vasoconstricting activities of Xamoterol. The serum concentration of Tamsulosin can be increased when it is combined with Cobicistat. Tamsulosin may increase the hypotensive activities of Niludipine. Tamsulosin may increase the hypotensive activities of Tetrahydropalmatine. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Prazosin. The risk or severity of adverse effects can be increased when Indoramin is combined with Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Nesiritide. Tamsulosin may increase the antihypertensive activities of Trimazosin. Tamsulosin may decrease the vasoconstricting activities of Dobutamine. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Mannitol. The serum concentration of Tamsulosin can be increased when it is combined with Boceprevir. Tamsulosin may decrease the vasoconstricting activities of Isoprenaline. The metabolism of Tamsulosin can be decreased when combined with Citalopram. The serum concentration of Conivaptan can be increased when it is combined with Tamsulosin. The metabolism of Tamsulosin can be increased when combined with Rifampicin. Esmolol may increase the orthostatic hypotensive activities of Tamsulosin. Tamsulosin may increase the hypotensive activities of Risedronate. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Guanfacine. The serum concentration of Tamsulosin can be increased when it is combined with Netupitant. Befunolol may increase the orthostatic hypotensive activities of Tamsulosin. The risk or severity of adverse effects can be increased when Phenelzine is combined with Tamsulosin. The serum concentration of Tamsulosin can be increased when it is combined with Nefazodone. Tamsulosin may increase the hypotensive activities of Lacidipine. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Methyclothiazide. Tamsulosin may increase the hypotensive activities of Carboxyamidotriazole. The metabolism of Tamsulosin can be decreased when combined with Mirabegron. The risk or severity of adverse effects can be increased when Sevoflurane is combined with Tamsulosin. Tamsulosin may decrease the vasoconstricting activities of Racepinephrine. The serum concentration of Tamsulosin can be increased when it is combined with Idelalisib. Tamsulosin may decrease the vasoconstricting activities of Olodaterol. The serum concentration of Tamsulosin can be increased when it is combined with Fluoxetine. Tamsulosin may decrease the vasoconstricting activities of Hexoprenaline. The risk or severity of adverse effects can be increased when Isoflurane is combined with Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Terazosin. The risk or severity of adverse effects can be increased when Paclitaxel is combined with Tamsulosin. Tamsulosin may increase the hypotensive activities of Gallopamil. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Doxazosin. Tamsulosin may decrease the vasoconstricting activities of Dipivefrin. The serum concentration of Tamsulosin can be increased when it is combined with Osimertinib. The risk or severity of adverse effects can be increased when Sufentanil is combined with Tamsulosin. The risk or severity of adverse effects can be increased when Epoprostenol is combined with Tamsulosin. Tamsulosin may decrease the vasoconstricting activities of Solabegron. The risk or severity of adverse effects can be increased when Selegiline is combined with Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Cilazapril. Tamsulosin may decrease the vasoconstricting activities of Dopexamine. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Amyl Nitrite. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Furosemide. Tamsulosin may decrease the vasoconstricting activities of Amibegron. The metabolism of Tamsulosin can be decreased when combined with Ranolazine. Dapoxetine may increase the orthostatic hypotensive activities of Tamsulosin. The risk or severity of adverse effects can be increased when Pramipexole is combined with Tamsulosin. Tamsulosin may decrease the vasoconstricting activities of Ritobegron. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Torasemide. Tamsulosin may decrease the vasoconstricting activities of Terbutaline. Timolol may increase the orthostatic hypotensive activities of Tamsulosin. Secobarbital may increase the hypotensive activities of Tamsulosin. The serum concentration of Tamsulosin can be increased when it is combined with Cinacalcet. Landiolol may increase the orthostatic hypotensive activities of Tamsulosin. Tadalafil may increase the hypotensive activities of Tamsulosin. The risk or severity of adverse effects can be increased when Bromocriptine is combined with Tamsulosin. The metabolism of Tamsulosin can be decreased when combined with Doxycycline. Atenolol may increase the orthostatic hypotensive activities of Tamsulosin. The serum concentration of Tamsulosin can be increased when it is combined with Abiraterone. Tamsulosin may increase the hypotensive activities of Felodipine. Tamsulosin may increase the hypotensive activities of Barnidipine. Tamsulosin may increase the hypotensive activities of Fendiline. Tamsulosin may decrease the vasoconstricting activities of Epinephrine. Tamsulosin may increase the hypotensive activities of Lercanidipine. Metoprolol may increase the orthostatic hypotensive activities of Tamsulosin. Carteolol may increase the orthostatic hypotensive activities of Tamsulosin. The metabolism of Tamsulosin can be increased when combined with Rifapentine. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Diclofenamide. Hexobarbital may increase the hypotensive activities of Tamsulosin. The metabolism of Tamsulosin can be decreased when combined with Imatinib. Sotalol may increase the orthostatic hypotensive activities of Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Captopril. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Valsartan. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Nitroprusside. The metabolism of Tamsulosin can be decreased when combined with Chlorpromazine. Tamsulosin may decrease the vasoconstricting activities of Droxidopa. Tamsulosin may increase the hypotensive activities of Manidipine. The serum concentration of Tamsulosin can be increased when it is combined with Ivacaftor. The metabolism of Tamsulosin can be decreased when combined with Ticlopidine. The risk or severity of adverse effects can be increased when Clofarabine is combined with Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Olmesartan. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Dexmedetomidine. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Canagliflozin. The risk or severity of adverse effects can be increased when Isocarboxazid is combined with Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Etacrynic acid. Tamsulosin may increase the hypotensive activities of Pinaverium. The serum concentration of Tamsulosin can be increased when it is combined with Ceritinib. The serum concentration of Tamsulosin can be increased when it is combined with Ketoconazole. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Telmisartan. The serum concentration of Tamsulosin can be increased when it is combined with Indinavir. Tamsulosin may decrease the vasoconstricting activities of Pseudoephedrine. The risk or severity of adverse effects can be increased when Moxonidine is combined with Tamsulosin. Methylphenobarbital may increase the hypotensive activities of Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Brimonidine. The metabolism of Tamsulosin can be increased when combined with Nevirapine. Alfuzosin may increase the antihypertensive activities of Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Thalidomide. The risk or severity of adverse effects can be increased when Fenoldopam is combined with Tamsulosin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Riociguat. The metabolism of Tamsulosin can be decreased when combined with Haloperidol. The risk or severity of adverse effects can be increased when Enalaprilat is combined with Tamsulosin. Tamsulosin may decrease the vasoconstricting activities of Arbutamine. Arotinolol may increase the orthostatic hypotensive activities of Tamsulosin. The serum concentration of Tamsulosin can be increased when it is combined with Quinidine. The serum concentration of Tamsulosin can be increased when it is combined with Amiodarone. Tamsulosin may decrease the vasoconstricting activities of Phenylephrine. The serum concentration of Tamsulosin can be increased when it is combined with Delavirdine. Tamsulosin may increase the hypotensive activities of Darodipine. The serum concentration of Tamsulosin can be increased when it is combined with Stiripentol. The risk or severity of adverse effects can be increased when Fimasartan is combined with Tamsulosin. Tamsulosin may increase the hypotensive activities of Tolfenamic Acid. The serum concentration of Tamsulosin can be increased when it is combined with Mifepristone. The risk or severity of adverse effects can be increased when Arsenic trioxide is combined with Tamsulosin. Bisoprolol may increase the orthostatic hypotensive activities of Tamsulosin. The serum concentration of Tamsulosin can be decreased when it is combined with Deferasirox. Tamsulosin may increase the hypotensive activities of Gabapentin. The risk or severity of adverse effects can be increased when Tamsulosin is combined with Spironolactone.