Tanoxin capsule is an alpha-blocker, which acts by binding to the alpha receptors in the urethra, thus blocking the sympathetic nerve action and reducing the resistance of the posterior urethra, effectively relieving the symptoms of waiting for urine, slim urine, weak urine and difficult urination due to increased resistance of the posterior urethra, treating benign prostatic hyperplasia and chronic prostatitis with difficult urination with definite effect. Side effects can occur mainly with postural hypotension. Therefore, tamsulosin extended-release capsules should be taken before sleep. During taking the medication, pay attention to slow change from low to high position when getting up or having squatting position to force position, in order to avoid the appearance of postural hypotension and mitigate the side effects.