Daclatasvir Dihydrochloride is a medication used in the treatment of chronic hepatitis C virus (HCV) infection. It belongs to a class of drugs known as direct-acting antivirals (DAAs).

Daclatasvir works by inhibiting the action of a protein called NS5A, which is essential for the replication of the hepatitis C virus. By blocking NS5A, daclatasvir prevents the virus from multiplying and spreading in the body, ultimately leading to its clearance.