300u

300u is a way of expressing 300 units of a substance, using the unit symbol “U” for international units. In medicine, units are used to quantify biological activity rather than mass, and “300 U” or “300u” refers to a specific amount of a drug or biologic as defined by standard references.

A prominent context is insulin glargine U-300, a concentrated long-acting basal insulin formulation that contains 300 units per milliliter. Marketed in some regions as Toujeo, it was developed to provide higher-dose insulin in smaller injection volumes and to offer a more stable, extended basal effect for people requiring substantial daily insulin.

Compared with the U-100 formulation of insulin glargine, U-300 is more concentrated, allowing smaller injection volumes and a flatter pharmacokinetic profile with a duration that can extend beyond 24 hours in many patients. The goal is to reduce peak insulin activity and potentially lower nocturnal hypoglycemia risk, though individual responses vary and not all patients benefit equally.

Dosing and switching guidance emphasize that insulin doses are measured in units per day. When moving from U-100 to U-300, clinicians typically aim to deliver the same total daily units but may adjust the dose based on absorption differences and glycemic response, with careful monitoring and gradual titration.

Safety considerations apply to all insulin use: inappropriate dosing can cause hypoglycemia or hyperglycemia. Patients should follow clinician guidance, be aware of the unit naming to avoid mix-ups with other measurements, and store and handle products as directed. The term 300u may also refer to 300 units of other drugs, with the context clarifying the substance involved.