Oil from pumpkin seeds has been widely used in the treatment of prostatic hyperplasia. In the present paper, the effect of lipophilic extract of Cucurbita pepo L seeds (ELMSC) was studied in an in vivo model of testosterone propionate -induced experimental prostatic hyperplasia during 15 days. It was found that ELMSC at doses of 400 and 200 mg/kg caused a significant decrease of prostatic growth. Our findings showed that doses of ELMSC over 200 mg/kg inhibits the testosterone-induced prostatic growth in the experimental model of prostatic hyperplasia in rats.