5-Alpha Reductase Inhibitors are medications that block the action of the enzyme 5-alpha reductase, which converts testosterone into dihydrotestosterone (DHT). DHT is linked to conditions like benign prostatic hyperplasia (BPH) and male pattern baldness. By reducing DHT levels, these inhibitors can help alleviate symptoms associated with enlarged prostates and promote hair regrowth. Common examples of 5-Alpha Reductase Inhibitors include finasteride and dutasteride. These drugs are often prescribed to improve urinary flow in men with BPH and to treat hair loss in men. While generally well-tolerated, they may have side effects, including sexual dysfunction and breast tenderness.