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DetrolÂ® LA (tolterodine ER) is a prescription medication used to treat an overactive bladder. It is an extended-release form of tolterodine that is taken just once a day. Brand-name Detrol LA is made by Pfizer, Inc. The drug is also available in generic form. Generic Detrol LA is available in the following strengths: 1  Tolterodine ER 2 mg capsules.  Tolterodine ER 4 mg capsules.
These acronyms often appear in the names of tablets or capsules that are designed to deliver medication to the body over time as opposed to being immediately released when ingested. Two examples of these drug names are Detrol LA (Tolderodine LA) and Tiazac XL (Diltiazem XL).