ARALAST NP [Alpha₁-Proteinase Inhibitor (Human)] 0.5g / 25 mL vial. Each vial is labeled with the total Alpha₁-Proteinase Inhibitor (Alpha₁-PI) functional activity in mg. The 0.5g vial size contains not less than 400 mg active Alpha₁-PI. ARALAST NP is packaged with a sterile double-ended transfer needle, a sterile 20 micron filter, and with Sterile Water for Injection, USP diluent (25mL).