Sustained-release (SR) capsule is a type of medication delivery system designed to release the active ingredient over an extended period of time, usually several hours to several days. The SR capsule may contain a controlled-release layer or matrix, a coating or a combination of these elements. The goal of SR capsule dosage form is to maintain a consistent and effective drug concentration in the body for an extended time, reducing the frequency of dosing and improving patient compliance. Examples of drugs that may be formulated as SR capsules include analgesics, anti-inflammatory drugs, and psychotropics. It's important to follow the prescribed dosing regimen and not crush or chew the capsule, as this may affect the controlled release of the active ingredient.