A 220 lbs. man had been receiving phenytoin sodium for some time (for weeks, but he does not remember for sure) at a dose of 360 mg extended release daily. His levels were checked 1month ago, and they were low at 7 mg/L. His dose at that time increased to 400 mg daily. His levels today are checked, and they are 10 mg/L. As he has been complaining that he has been having seizures, the CRNP (Certified nurse practitioner) increases his dose to 500 mg daily. What would you estimate his levels to be once he reached a steady state at his new dose?
[Solved]: A 220 lbs
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