In medication terminology, what does 'SR' signify?

The term 'SR' in medication terminology signifies "sustained release." This designation is used to describe a formulation of medication designed to release the active ingredient gradually over an extended period of time. This extended-release mechanism allows for a longer duration of action, minimizes peak-and-trough levels in the bloodstream, and can improve patient compliance by reducing the frequency of dosing. Sustained release formulations are beneficial for medications that require maintaining a consistent therapeutic level over time without the need for frequent administration, which can enhance overall effectiveness and patient adherence to the medication regimen.