A recent article in Pharmacy Practice News discussed ways in which updated labeling standards for Heparin Sodium Injection and Heparin Lock Flush Solution may not eradicate the problems associated with overdose completely. One major reason being that some of the older problematic versions of the label remain in pharmacy stocks.
According to information on the relevant organization’s website, the new labeling requirements, which took effect this May, require that the new heparin products clearly indicate the concentration of the medication, followed by how much medication is in each milliliter (mL).
Prior labels stated the per mL amount, with the total container volume appearing elsewhere, thus leading to errors when practitioners mistook the per mL amount as the total volume in the vial. This sort of mistake led to dangerous heparin overdoses.
For example, in one case a patient died due to bleeding in the brain, which occurred as a result of two practitioners mistakenly thinking that a 10-mL vial of heparin held a total of 1,000 units, when each vial actually contained 10,000 units (1,000 units/mL). As a result, they administered 30,000 units to the patient instead of 3,000.