The invention relates to iRNA, e.g., double stranded ribonucleic acid (dsRNA), compositions targeting the Serpinc1 gene, and methods of using such iRNA, e.g., dsRNA, compositions to inhibit expression of Serpinc1 and to treat subjects having a Serpinc1-associated disease, e.g., a bleeding disorder, such as a hemophilia.本發明係關於iRNA如雙股核糖核酸(dsRNA)、以Serpinc1基因為靶向之組成物、及使用該iRNA如dsRNA以及組成物來抑制Serpinc1之表現並治療罹患如出血性疾患如血友病之Serpinc1相關疾病之對象的方法。