TAMSULOSIN HYDROCHLORIDE 0.4MG – G FLOW contains Tamsulosin Hydrochloride 0.4mg, an alpha-blocker used to treat symptoms of benign prostatic hyperplasia (BPH), a condition that causes an enlarged prostate. It works by relaxing the muscles in the prostate and bladder neck, improving urine flow and reducing symptoms such as frequent urination, difficulty starting urination, and weak urine stream.