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The two primary drug classes used for BPH are: Alpha-blockers. These drugs relax smooth muscles, especially in the bladder neck and prostate. They include terazosin (Hytrin), doxazosin (Cardura), tamsulosin (Flomax), alfuzosin (Uroxatral), and silodosin (Rapaflo). Alpha-blockers help relieve BPH symptoms, but they do not reduce the size of the prostate.
Pentosan is used to relieve the symptoms of the bladder condition called interstitial cystitis. This medicine is available only with your doctor's prescription. Take this medicine on an empty stomach (at least 1 hour before or 2 hours after meals) and at least 1 hour before or after any other food, milk, or medicine. Also, always take it with a full glass (8 ounces) of water.