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Finasteride blocks 5-alpha reductase, the enzyme that converts testosterone into dihydrotestosterone (DHT).
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DHT is the hormone mainly responsible for shrinking hair follicles in genetically susceptible men.
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By lowering DHT, finasteride helps slow or stop hair loss and can promote regrowth in some men.
This information is provided for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Finasteride is a prescription medication that should only be used under the guidance of a qualified healthcare professional. Do not start, stop, or change your medication without consulting your doctor. Possible side effects, risks, and benefits vary for each individual. If you are experiencing hair loss or considering treatment, please speak with your healthcare provider to determine the safest and most effective options for you.