Time release technology
（重定向自Extended release）
Time release technology (also known as sustained-release [SR], extended-release [ER, XR, XL], controlled-release [CR], and other synonyms) is a mechanism used in pill tablets or capsules to dissolve a drug over time in order to be released slower and steadier into the bloodstream while having the advantage of being taken at less frequent intervals than immediate-release (IR) formulations of the same drug. For example, extended-release morphine allows for people with chronic pain to only need one or two tablets per day. The earliest SR drugs is associated with a patent in 1938 by Israel Lipowski, who coated pellets which led to coating particles.