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A provider prescribes potassium chloride 0.5 mEq/kg/day IV piggyback divided in doses every 12 hours to a patient who weighs 198 lb. Available is 2 mEq per 1 mL. What is the amount a pharmacy technician should dispense in milliliters per dose?

Answer :

Final answer:

The total amount of potassium chloride in milliliters per dose needed for a patient who weighs 198 lb, given the prescription of potassium chloride 0.5 mEq/kg/day IV piggyback in doses every 12 hr, is 11.25 mL per dose.

Explanation:

To calculate the amount of potassium chloride needed for a patient, we first need to do a series of unit conversions and then apply the medication dosage formula. The patient's weight is given in pounds (lb) and needs to be converted to kilograms (kg) since the prescribed medication dosage is in milliequivalents per kilogram (mEq/kg). Here's how:

1 kg = 2.2 lb, so the patient’s weight in kg is 198 lb / 2.2 = 90 kg

Next, we calculate the total daily dose, which is ordered as 0.5 mEq/kg/day. So, 90 kg * 0.5 mEq/kg/day = 45 mEq/day.

The total daily dose is divided into doses every 12 hours, so each dose will be 45 mEq/day / 2 = 22.5 mEq per dose.

Finally, we need to convert the dose from mEq to mL, based on the available medication concentration. The available concentration is 2 mEq per 1 mL, which we can write as 2 mEq/mL. So, the volume for each dose will be 22.5 mEq per dose / 2 mEq/mL = 11.25 mL per dose.

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