Which premedication assessment by the nurse is most important prior to the initiation of carbamazepine (Tegretol)therapy?

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Carbamazepine has a known risk of causing severe skin reactions (such as Stevens-Johnson syndrome and toxic epidermal necrolysis) that are significantly more common in patients with the HLA-B*1502 allele, which is prevalent in people of Asian descent. Therefore, determining a patient's ancestry can help assess their risk for these reactions.

Which Premedication Assessment by the Nurse Is Most Important Prior