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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.
Detrol (tolterodine) reduces spasms of the bladder muscles. Detrol is used to treat overactive bladder with symptoms of urinary frequency, urgency, and incontinence. Detrol may also be used for other purposes not listed in this medication guide. Important information.