The names of some pills have extensions like SR, XR, CR, ER, TR, XL abbreviations?
The abbreviations should be interpreted in the following way: extended-release (ER, XR, or XL), sustained-release (SR), controlled-release (CR), time-release or timed-release, or continuous-release (CR or Contin) pills. These are capsules or tablets that dissolve slowly and release the active drug over time. Sustained-release tablets or capsules can maintain sreadier level or drug in the blood. They are structured so that the active ingredient is contained in a matrix of insoluble substance. The active ingridient gradually dissolves when it finds its way out through the holes in the insoluble matrix. Consequently, sustained-release can be taken less frequently than instant-release formulations of the same medication.
