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Finasteride is an azasteriod that inhibits the type-2 isoform of 5α-reductase, the enzyme responsible for conversion of testosterone to the more active dihydrotestosterone, and therefore has anti-andregenic properties. It is given by mouth in a dose of 5 mg daily in the management of benign prostatic hyperplasia to cause regression of the enlarged prostate and to improve symptoms: it may be delayed and treatment for 6 months or more may be required to assess whether benefits has been achieved.
Or as prescribed by the physician.
