Aprepitant is a neurokinin-1 (NK₁) receptor antagonist used in pharmaceutical formulations aimed at preventing chemotherapy-induced nausea and vomiting (CINV) and postoperative nausea and vomiting (PONV) . Aprepitant w/w refers to a weight-to-weight (w/w) premix or granulated API designed for improved flow, uniformity, and ease of tableting or caps