ER capsule stands for "extended-release capsule." It is a type of capsule dosage form that releases its active ingredients over an extended period of time, typically several hours. This is different from immediate-release capsules, which release their active ingredients relatively quickly, typically within minutes of ingestion. ER capsules are designed to provide a slow and consistent release of medication, helping to maintain stable blood levels of the active ingredient and reduce the frequency of dosing. This can be useful for certain medications, such as those used to treat chronic conditions, where it is important to maintain stable levels of the medication in the body over time. ER capsules are taken orally, usually with a glass of water. It is important to follow the manufacturer's instructions for use, as well as any guidelines from your healthcare provider, to ensure proper and safe use of this dosage form.