5β-Dutasteride is the 5β-epimer stereoisomer of Dutasteride, a synthetic dual inhibitor of type 1 and type 2 5α-reductase enzymes. It is primarily employed in biochemical research to investigate stereochemical specificity in 5α-reductase inhibition, androgen metabolism, and related pharmacological pathways. Not approved or used for clinical treatment of benign prostatic hyperplasia (BPH), hair loss, or any therapeutic indications.