A client is prescribed 500 mg of ampicillin IM. The drug is supplied in a multidose vial that requires reconstitution with 2 mL sterile water for injection. The resulting concentration contains 250 mg/mL. The nurse would administer how much of the drug?
A) 0.5 mL
B) 1.0 mL
C) 1.5 mL
D) 2.0 mL
Ans: A
Feedback:
After reconstitution, the vial yields 500 mg/mL. To calculate the amount needed to give, set up a proportion to read: 500/1 = 250/X; cross-multiply to arrive at 500X = 250; X = 0.5 mL.
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