Extended-release (ER) refers to a type of medication formulation designed to release the active ingredient slowly over time. This allows for a more consistent level of the drug in the bloodstream, reducing the need for frequent dosing. ER medications are often used for chronic conditions, providing longer-lasting effects compared to immediate-release formulations. These medications can improve patient adherence, as they simplify the dosing schedule. For example, a patient taking a pain reliever in an ER form may only need to take it once or twice a day, rather than multiple times, making it easier to manage their treatment plan.