Baclofen is a racemic mixture that is commonly used for the treatment for spasticity.\nHowever, the optimal dose and dosing interval to achieve effective cerebral spinal fluid (CSF)\nconcentrations of baclofen are not known. Moreover, it is unclear if there are differences in the ability\nof R- or S-baclofen to cross the bloodâ??brain barrier and achieve effective CSF concentrations. We have\nvalidated a liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method\nwith improved selectivity and sensitivity for the simultaneous quantitation of R- and S-baclofen\nand metabolites in plasma and CSF. ..........................
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