Finasteride prevents hair growth at the top of the head called "crown" and also stops hair follicles growing below this point. Finasteride works best for individuals whose hairline recedes during adulthood. Men over 18 years old can safely use finasteride. Children under 18 years old should not take this medicine without consulting their doctor first. Priceless Prostate Cancer Prevention – The only FDA-approved treatment proven to prevent men from getting prostate cancer. Finasteride helps reduce hair loss by blocking DHT, a hormone associated with male pattern baldness. It does not cure men who have lost their hair due to other causes. A drug used to treat BPH, Finasteride helps prevent hair loss and reduce enlarged prostate tissue. This medication works by reducing levels of dihydrotestosterone (a form of testosterone made after conversion through the action of an enzyme known as 5 alpha Reductase Type 2 - also known as SRD5A2.) The reduction of Dihydrotesterone decreases enlargement of glandular tissues within the prostate resulting in improved urine flow rates and reduced bladder pressure. In addition, finasteride inhibits the formation of sebum oil (sebaceous glands produce oils that aid lubrication) thereby decreasing oily discharge. Men taking Propecia® 0.5mg, 1mg, and/or 5mg once a week experienced significant improvements in both total head count and percentage reduction compared to placebo after 4 months. Hair growth was observed in over 80% of patients treated with either dosage level of Propecia®, regardless of whether treatment began before or during the active phase of terminal telogen effluvium. In fact, hair grew back sooner than expected in many cases. The results obtained indicate that Propecia® provides substantial benefit to individuals suffering from thinning hair due to genetic predisposition or hormonal imbalance. For this reason alone, Propecia® represents an essential element of any regimen designed to address male pattern baldness.