Finasteride is a medication primarily used to treat male pattern baldness and benign prostatic hyperplasia (BPH). It works by inhibiting the enzyme 5-alpha-reductase, which converts testosterone into dihydrotestosterone (DHT). By reducing DHT levels, Finasteride can help slow hair loss and promote hair regrowth in men. In addition to its use in hair loss treatment, Finasteride is also prescribed to alleviate urinary symptoms associated with an enlarged prostate. It is important for patients to discuss potential side effects, such as decreased libido or erectile dysfunction, with their healthcare provider before starting the medication.