Does anyone know what the difference is between the two XANAX XR and ALPRAZOLAM ER? I went to my doctor today and ask him to put me on Xanax XR when I filled my prescription i looked at the bottle and it reads Alprazolam ER.Did I get the wrong medication? I cant call my doctor or pharmacy until the morning.Does anyone know if they are the same thing? Any info would be greatly appreciated.Thanks in advance and God Bless.

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