The invention relates to double-stranded ribonueleic acid (dsRNA) compositions targeting the ALAS1 gene, and methods of using such dsRNA compositions to alter (e.g., inhibit) expression of ALAS1.本發明係關於靶向ALAS1基因之雙股核糖核酸(dsRNA)組合物,及使用該等dsRNA組合物以改變(例如抑制)ALAS1表現之方法。