Finasteride, a medication used for hair loss, inhibits the conversion of testosterone into DHT, a hormone that causes hair follicle miniaturisation and loss. By blocking the enzyme 5-alpha-reductase, finasteride reduces DHT levels in the scalp, reversing miniaturisation and promoting hair growth. It is taken orally once daily at a 1mg dosage. Finasteride is only suitable for men with male pattern hair loss. Clinical studies show its effectiveness, but results vary. Consult a healthcare professional before starting, as side effects like decreased libido and breast tenderness may occur. Finasteride offers a convenient solution for hair loss, but personalised advice is essential for safe use.