Mrs. Sanderson was admitted to the hospital with a severe methicillin-resistant Staphylococcus aureus (MRSA) infection. She is 84 years old, 5 ft 4 in. tall, and weighs 180 lb. She has normal renal function. The physician has ordered Garamycin® 70 mg IM q8h. On hand: Garamycin® Injectable 40 mg/mL. According to the package insert, the usual dosage for patients with serious infections and normal renal function is 1 mg/kg q8h. The ideal weight range for this patient is 122 to 157 lb. If the ordered dose is safe, calculate the amount to administer: ________. If the dose is not safe, write: not safe.
Fill in the blank(s) with the appropriate word(s).
1.8 mL
The dose should be based on the patient's ideal weight. Calculate the safe dose range:
Minimum: 
= 55.45, rounded to 55 kg
55 kg × 1 mg/kg = 55 mg
Maximum: 
= 71.36, rounded to 71 kg
71 kg × 1 mg/kg = 71 kg
The ordered dose is within this range, so the dose is safe.
Calculate the amount to administer:
D = 70 mg; Q = 1 mL; H = 40 mg
×1 mL = 1.75 mL, rounded to 1.8 mL
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