A known method for synthesis of dutasteride (R. Davis and al., 2002) was modified and improved by replacing 1,2 eq of SOCl2, with 1,05 eq, use of PhMe as reaction medium and product purifn. by recrystn. from the 1:1 AcOEt/heptane mixt. The new technol. allowed manufacturing the product of pharmaceutical-grade purity (99.31%) with high yield (77,2%). The complete H-1 and C-13 NMR spectral anal. of dutasteride was carried out.