It works by relaxing muscles in the prostate and bladder neck, making it easier to urinate. Tamsulosin may cause dizziness, lightheadedness, or fainting alcohol, hot weather, exercise, or fever may increase these effects. The impact and the benefits of the medicine. Blocking by Flomax smooth muscle tone in the prostate and bladder neck. Flomax has been known to cause priapism a painful, persistent erection unrelated to sexual activity.
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