What is the definition of sustained release medication?

Sustained release medication is defined as a formulation designed to release the active ingredient slowly over an extended period of time. This allows for a prolonged therapeutic effect, minimizing the need for frequent dosing and providing more stable drug levels in the bloodstream.

The mechanism behind sustained release is to control the rate of the drug's absorption, which can enhance efficacy and reduce side effects compared to immediate release forms. This type of medication typically results in steadier plasma concentrations and can help improve patient compliance by decreasing the number of doses required throughout the day.

In contrast, the other options describe different characteristics of medications that do not align with the sustained release definition. Immediate effect and rapid dissolution refer to quick onset forms, while requiring multiple doses relates to medications that do not have sustained delivery systems.