Sustained-release dosage forms are dosage forms designed to deliver (free) a medication at a foreordained rate to keep a steady medication focus for a particular timeframe with least secondary effects. This can be accomplished through an assortment of details, including liposomes and medication polymer forms (a model being hydrogels). Supported delivery's definition is more likened to a "controlled delivery" rather than "maintained". Expanded delivery measurements comprises of either supported delivery (SR) or controlled-discharge (CR) dose. SR keeps up with drug discharge over a supported period yet not at a steady rate. CR keeps up with drug discharge over a supported period at an almost steady rate.