About Dutasteride (a generic version of Zagallo) Dutasteride blocks the action of an enzyme called 5-alpha-reductase”, The medication works by blocking the production of a hormone called dihydrotestosterone from testosterone. By attaching to the enzyme 5 alpha-reductase, dutasteride will slow hair loss and help people regrow hair. Finasteride (Propecia) is another medication for AGA. When … Continue reading About Dutasteride