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Discussion

Help with a dosage calculation

A nurse is preparing administer ampicillin 25 mg/kg PO divided in equal doses every 12 hrs to an adolescent who weighs 99 lbs.The amount available is ampicillin suspension 50mg/5ml.How many ml should the nurse administer per dose

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    • Experts

    Have you tried to figure this out on your own? You won't learn if we do it for you. First you need to convert the weight to kilograms. Do that and then let's us know what each dose will be.

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    • Author

    Yes and I got 5ml.....but it's wrong and I can't figure out why

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    • Author

    Ok so now this is the steps to took but insure if it's right...99÷2.2=45 45×25=1125 1125÷50=22.5 22.5×5=112.5ml....but I don't know if that's rigjt or if I did it correct

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    I totally missed the divided dose part.

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    • Experts

    You divide the 1125 in half not by 50.

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    • Experts

    562.5

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    562.5

    That's the total mgs, not total ml

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    Ok so now this is the steps to took but insure if it's right...99÷2.2=45 45×25=1125 1125÷50=22.5 22.5×5=112.5ml....but I don't know if that's rigjt or if I did it correct

    You were correct through the bolded. I assume the 25mg/kg PO is the daily dose. If so, then it needs to be divided by 2, not by 50 (since 1125 is daily dose, and it's being given BID).

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    • Experts
    That's the total mgs, not total ml

    I know. I was working it through step by step.

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    • Experts

    50 mg per 5 ml works out to 10 per ml. 562.5 Mgs would be 56.25 mls

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    • Experts

    Moved to the Nursing Student Assistance forum.

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    You were correct through the bolded. I assume the 25mg/kg PO is the daily dose. If so, then it needs to be divided by 2, not by 50 (since 1125 is daily dose, and it's being given BID).

    They are correct through the entire thing, there is however one more step. The 112.5ml is the daily dose. Divide by two and you have the correct answer.

    There are multiple ways to get to the correct answer.

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