What is an example of a drug release system intended for extended action without peaks and troughs?

Sustained release systems are specifically designed to release a drug gradually over an extended period, which helps maintain consistent drug levels in the bloodstream without causing significant peaks and troughs. This continuous release mechanism is crucial for managing conditions where stable drug concentrations are necessary for therapeutic efficacy, minimizing side effects that may result from fluctuating drug levels.

In contrast, conventional release systems typically provide an immediate release of the drug, which can lead to sharp increases in blood drug concentration, followed by a rapid decline. High-dose release does not relate to the pattern of release but rather focuses on the quantity of the drug administered. Instant release formulations deliver the active ingredient immediately upon administration, also resulting in noticeable peaks in concentration shortly after dosing. Therefore, sustained release is the method that aligns with the goal of achieving an extended action without significant fluctuations in drug levels.