TAMVANCE SR 0.4MG 20sTamvance SR 0. 4mg Tablets contain Tamsulosin Hydrochloride (Sustained Release), a medication used to treat benign prostatic hyperplasia (BPH) in men. It works by relaxing the muscles of the prostate and bladder neck, helping to improve urine flow and reduce urinary symptoms such as difficulty in urination and frequent urination. Uses Benign Prostatic Hyperplasia (BPH) Difficulty in urination Weak urine flow Frequent or urgent urination Prostate