pharmaceutical calculation

2014-05-07 5:40 am

i hope you can show the step for all calculation....

1. A patient is to receive a drug IM 0.6mg/kg q4h as needed. the patient weight 28Ibs. the drug concentration is 25mg/ml. how many mls will the patient need per dose? (ans: 0.3ml)

2.The drug ordered is availble in pharmacy in a concentration of 0.5mg/ml. the physician orders a dose of 25 mcg/kg for a patient who weight 160Ibs. how many mls will be needed to fill the order? (ans:3.6ml)

3.A physician orders a medication for a patient who weight 130Ibs. the order read 300mg/kg in 50 ml D5W q4h. how many grams of the medication will be patient receive in 24 hrs? (ans:106.4g)

回答 (1)

用戶10012

2014-05-07 3:50 pm

✔ 最佳答案

1. Weight of patient in kg = 28/2.2 kg.
So weight of drug the patient should take = 0.6 mg/kg x 28/2.2 kg
= 0.6 x 28/2.2 mg.
Since concentration of drug is 25mg/ml, so drug in ml
= [ 0.6 x 28/2.2] mg / 25mg/ml = (0.6 x 28)/(2.2 x 25) ml = 0.305 ml per dose.
2.
Weight of patient in kg = 160/2.2 kg.
So weight of drug ordered to take = 25mcg/kg x 160/2.2 kg
= ( 25 x 160/2.2) mcg = (25 x 160)/(2.2 x 1000) mg.
Since concentration is 0.5 mg/ml, so drug in ml
= {(25 x 160)/(2.2 x 1000) mg}/ 0.5 mg/ml
= (25 x 160)/(2.2 x 1000 x 0.5) ml
= 3.636 ml.
3.
Weight of patient in kg = 130/2.2 kg
So drug ordered to take = 300 mg/kg x 130/2.2 kg = 300 x 130/2.2 mg
= (300 x 130)/(2.2 x 1000) gram.
Since q4h is 6 times in 24 hrs., so drug to take in 24 hrs.
= (300 x 130 x 6)/(2.2 x 1000) g
= 106.4 g.

2014-05-07 07:53:36 補充：
For Q3, 50ml D5W is just the solution used to mix with the medicine, it has nothing to do with the quantity of medicine to be taken.

2014-05-07 07:56:27 補充：
For Q1, since the question is ml per dose, so disregard q4h.

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