Tamsulosin is a medication primarily used to treat the symptoms of an enlarged prostate gland, a condition called benign prostatic hyperplasia (BPH). It works by relaxing the smooth muscles in the prostate and bladder neck to improve urine flow and decrease symptoms such as difficulty urinating, weak urine stream, and urinary frequency and urgency. Tamsulosin belongs to a class of drugs called alpha-blockers and is available in oral capsule form. It is typically taken once a day, preferably at bedtime, and should be used under the guidance of a healthcare provider. Tamsulosin may cause side effects such as dizziness, headache, and low blood pressure, so it is important to follow the instructions of a healthcare provider and report any adverse effects promptly.