A nurse is preparing to administer cephalexin 25 mg/kg/day PO divided in equal doses every 6 hr to a toddler who weighs 26 lb. Available is cephalexin suspension 250 mg/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.5"]
To calculate the dosage of cephalexin for the toddler, first convert the weight from pounds to kilograms, knowing that 1 kilogram equals 2.2 pounds. The toddler weighs 26 lb, which is approximately 11.82 kg (26 / 2.2 = 11.82). Next, calculate the daily dose in milligrams using the prescribed dose of 25 mg/kg/day: 11.82 kg * 25 mg/kg/day = 295.5 mg/day. Since the medication is to be divided into equal doses every 6 hours, there will be four doses per day. Therefore, the dose per administration is 295.5 mg/day divided by 4, which equals 73.875 mg/dose. Now, using the concentration of the cephalexin suspension (250 mg/5 mL), calculate the volume of suspension needed per dose: 73.875 mg * (5 mL / 250 mg) = 1.4775 mL. Rounded to the nearest tenth, the nurse should administer 1.5 mL per dose.
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Related Questions
Correct Answer is ["1.2"]
Explanation
To calculate the dosage of prochlorperazine for the adolescent, first convert the weight from pounds to kilograms, knowing that 1 kilogram equals 2.2 pounds. The adolescent weighs 103 lb, which is approximately 46.82 kg (103 ÷ 2.2). Next, multiply the weight in kilograms by the dosage prescribed, which is 0.13 mg/kg. This results in a total dosage of 6.09 mg (46.82 kg × 0.13 mg/kg). Finally, divide the total dosage by the concentration of the available medication to find out how many mL to administer. The available prochlorperazine injection has a concentration of 5 mg/mL, so you would administer 1.22 mL (6.09 mg ÷ 5 mg/mL). Rounded to the nearest tenth, the nurse should administer 1.2 mL per dose.
Correct Answer is ["0.5"]
Explanation
To calculate the dosage of quinine for the child, first convert the child's weight from pounds to kilograms, knowing that 1 kilogram equals 2.2 pounds. The child weighs 36 pounds, which is approximately 16.36 kilograms (36/2.2). Next, calculate the total daily dose of quinine using the child's weight in kilograms: 25 mg/kg/day * 16.36 kg = 409 mg/day. Since the dose is divided into equal doses every 8 hours, divide the total daily dose by 3 to get the per dose amount: 409 mg/day / 3 doses/day = approximately 136.33 mg/dose. Finally, to find out how many 325 mg tablets the nurse should administer per dose, divide the per dose amount by the strength of the tablet: 136.33 mg/dose / 325 mg/tablet = approximately 0.42. Rounding to the nearest whole number, the nurse should administer half a tablet per dose.
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