<prompt> Mechanism of action of Silodosin:Alpha antagonistBeta antagonistAnticholinergicPDE5 inhibitor  <response>: MEDICAL THERAPY IN BPH Alpha-blockers: Prazosin, terazosin, doxazosin, tamsulosin, alfuzosin, silodosin Relaxes smooth muscle decreases urethral resistance. Side effects: ohostatic hypotension, dizziness, tiredness, retrograde ejaculation, rhinitis headache. 5-Alpha-reductase Inhibitors: Finasteride, dutasteride, triptorelin pamoate 