The nurse is reviewing a patient's chart prior to administering gentamycin (Garamycin) and notes that the last serum peak drug level was 9 mcg/mL and the last trough level was 2 mcg/mL. What action will the nurse take?
a. Administer the next dose as ordered.
b. Obtain repeat peak and trough levels before giving the next dose.
c. Report possible drug toxicity to the patient's provider.
d. Report a decreased drug therapeutic level to the patient's provider.
ANS: C
Gentamycin peak values should be 5 to 8 mcg/mL, and trough levels should be 0.5 to 2 mcg/mL. Peak levels give information about whether or not a drug is at toxic levels, while trough levels indicate whether a therapeutic level is maintained. This drug is at a toxic level, and the next dose should not be given.
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