Metoprolol SUCCINATE Twice Daily??

I have seen multiple times in practice a patient prescribed Metoprolol Succinate prescribed BID. The only recommended dosing for this extended release formulation I can find is once daily. I can find absolutely 0 literature on Metoprolol Succinate dosed twice daily. Am I severely missing something? What would be the benefits/drawbacks of Toprol XL twice daily?? My moms pharmacist even said it was fine. I'm lost. Any information anyone has is requested!
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pharmacy Source Type: forums