SPL Set ID: c45f9a58-37c1-4f76-8e36-97d38c577037

Romiplostim is a thrombopoietin receptor agonist (TPO-RA). Romiplostim, a member of the TPO mimetic class, is an Fc-peptide fusion protein (peptibody). The peptibody molecule contains two identical single-chain subunits, each consisting of human immunoglobulin IgG1 Fc domain, covalently linked at the C-terminus to a peptide containing two thrombopoietin receptor-binding domains. Romiplostim has no amino acid sequence homology to endogenous TPO. Romiplostim is produced by recombinant DNA technology in Escherichia coli (E . coli) . Nplate (romiplostim) for injection is supplied as a sterile, preservative-free, lyophilized, solid white powder for subcutaneous use. Nplate is supplied as either 125 mcg per vial, 250 mcg per vial or 500 mcg per vial of romiplostim and requires reconstitution with Sterile Water for Injection to obtain a concentration of 500 mcg/mL. Each single-dose 125 mcg vial of Nplate contains the following: 125 mcg of romiplostim, L-histidine (0.7 mg), mannitol (18 mg), polysorbate 20 (0.02 mg), sucrose (9 mg), and sufficient HCl to adjust the pH to a target of 5. Reconstitution with 0.44 mL of Sterile Water for Injection provides a resulting concentration of 125 mcg/0.25 mL. Each single-dose 250 mcg vial of Nplate contains the following: 250 mcg romiplostim, L-histidine (1.2 mg), mannitol (30 mg), polysorbate 20 (0.03 mg), sucrose (15 mg), and sufficient HCl to adjust the pH to a target of 5. Reconstitution with 0.72 mL of Sterile Water for Injection provides a resulting concentration of 250 mcg/0.5 mL. Each single-dose 500 mcg vial of Nplate contains the following: 500 mcg romiplostim, L-histidine (1.9 mg), mannitol (50 mg), polysorbate 20 (0.05 mg), sucrose (25 mg), and sufficient HCl to adjust the pH to a target of 5. Reconstitution with 1.2 mL of Sterile Water for Injection provides a resulting concentration of 500 mcg/mL.