Propecia is a medication classified as a 5 alpha-reductase inhibitor.
Propecia is a medication classified as a 5 alpha-reductase inhibitor. It is commonly used to treat male pattern baldness by blocking the enzyme 5 alpha-reductase, which produces dihydrotestosterone (DHT). DHT disrupts the hair growth cycle, weakening hair follicles and causing them to fall out more easily.
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