Heparin Sodium Injection 40000 Units Per 4 mL Multiple Dose Vials, 4 mL x 25/Pack (RX)Heparin Sodium Injection (40,000 Units) Heparin sodium injection is a powerful anticoagulant (blood thinner) given by a healthcare professional. It comes as a liquid injection for intravenous (IV) infusion or subcutaneous (under the skin) injection. Its strength is measured in units of activity (USP units), not milligrams. A 40,000 unit vial is a very high strength preparation typically used in hospitals to prepare infusions or multiple doses. Heparin