The physician has ordered 140 mg of ampicillin for an infant to be administered intramuscularly (IM). The nurse reads the vial and determines that there is 0.25 kg in 5 mL. How many mL of medication will the nurse prepare?
1. 7 mL
2. 0.07 mL
3. 2.8 mL
4. 0.28 mL
3
Rationale: In order to calculate the proper dosage, 0.25 kg must be converted to mg to match the ordered dosage. 0.25kg = 250 mg. 250 mg/5 mL = 140 mg/x; cross-multiply, yielding 250x = 700. Divide both sides by 250, yielding x = 2.8 mL.
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