It is ordered when you start taking the drug phenytoin in order to maintain a therapeutic level, to detect potential for toxicity or when a person’s condition does not appear to be responding to the drug. Once stable concentrations in the therapeutic range are achieved, phenytoin is ordered at regular intervals to ensure that it remains in range. It may also be ordered you experience symptoms of toxicity like nausea, swelling of gums, confusion, difficulty swallowing, rashes etc.
No special preparation required
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