Drug Computations 1

8/4/2019 Drug Computations 1

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Formulas:

1. Clark’s RuLE : Child’s dose = Adult dose x weight ( lbs.)

_____________________

1502. Young’s Rule: Child’s Dose = Adult dose x age

______________

Age + 12

3. Ideal Body weight ( ages 2-10 years)Weight ( lbs.) = age in years x 5 +18

4. Ideal body weight ( ages 2-10 years )

Height ( inches) = age in years x 2 + 32

5. Fahrenheit to Celsius: 0c = 5/9 x ( 0F – 32 )

6.Celsius to Fahrenheit : 0F = (9/5 X 0C ) + 32

EXAMPLE:

1. A patient is to receive 100,000 U of an oral suspension of Penicillin QID. A bottle containing 300,000 U penicillin in5 cc of solution is to be used to prepare the ordered dose.How much solution will contain the ordered dose.



100,000 U: x cc = 300,000 U: 5 cc

3000, 000x = 500,000X = 500,000

_______

300,000

X= 1.5 cc OF THE STOCK= 100,000 U

2. The doctor orders Lanoxin for patient. The dose ordered is0.08 mg. Lanoxin is available in a solution with 0.05mg./ml. How much do u prepare?

0.08 mg: x ml = 0.05 mg: 1 ml

0.05x = 0.08

X = 0.08

_____

0.05

X = 1.6 ml of the stock = 0.08 mg.

3. The doctor orders insulin 25 U OD. The available stock is40 U/cc. How much insulin should be drawn up in aminim?



Formulas:

25 U : x cc = 40 U : cc

40 x = 25

X = 25___

40

X = .625 cc

1 cc = 15 – 16 minutes

.625 cc

X 15 minims

_____________ 3125

625

9.375 = 10 minims

4. The doctor orders atropine so4 gr. 1/300 IM preop. The vialreads : “ Atropine 0.4 mg./ml” How much should the nurseadminister?

First step: 60 mg. = 1 grain



1/300 gr. : x mg = 1 gr. : 60 mg.

X mg = 1/300 x 60

X mg = 60/300X mg = 0.2 mg. = 1/300 gr.

Second step:

.2 : x ml = .4 mg : 1 ml

0.4x = 0.2X = 0.2/0.4

X = 0.5 ml of the stock = gr. 1/300

5. The doctor orders ASPIRIN 150 mg. QID PRN. You haveon hand aspirin 1 tab = 11/4 gr. How many tablets shouldyou give?

First step: 60 mg =1 gr.

1.25 gr. : x mg. = 1 gr. : 60 mg.

X = 1.25 x 60 = 75 mg. = 1 ¼ gr.

Second step:

150 mg : x tabs = 75 mg. : 1 tab



Formulas:

75 x = 150

X = 150/75

X = 2 tablets of the 150 mg. Stock

6. A patient is to receive 5 % dextrose and LR, 1000 ML IVin 24 hrs. The drop factor of the mini dropper is 60/ml. Thenurse should regulate the IV to run at?

Total ml. To be infused x drop factor

Total time to infuse ( in minute )

1000 x 60 = 6000 = 41. 6 mcgtts/min = 42

______________________________________

24 x 60 = 1,440



DRUGS COMPUTATIONS :

1. An infant is ordered to receive 500ml of D5NSS for 24 hours.The intravenous drip is running. at 60 drops/minute. Howmany drops per minute should the flow rate be?

A. 60 drops per minute

C. 30 drops per minute

B.21 drops per minute

D. 15 drops per minute

2. Following surgery, Henry is to receive 20 mEq(milliequivalent) of potassium chloride to beadded to 1000 ml of D5W to run for 8 hours. The intravenousinfusion set is calibrated at 20drops per milliliter. How many drops per minute should the rate

be to infuse 1 liter of D5W for 8hours?

A.42 drops

C. 60 drops

B. 20 drops



Formulas:

D. 32 drops

3.. Mr. Lagro is to receive 1 liter of D5LR to run for 12 hours.The drop factor of the IV infusionset is 10 drops per minute. Approximately how many drop per minutes should the IV beregulated?

A.13-14 drops

C. 10-12 drops

B. 17-18 drops

D. 15-16 drops

4. The physician ordered Nembutal Na gr XX. The bottlecontains 100mg/capsule. How many

capsule will be administered to the client?

A. 1 capsule

C. 2 capsule

B. 1 ½ capsule

D. ½ capsule

5. When giving Demerol 50 mg from a multidose vial labelled100 mg/ml and Vistaril 50 mg/ml

from an ampule labelled 50 mg/ml, what is the total volume thatyou will inject to the client?

A. 2 ml

C. 1.5 ml



B. 1 ml

D. 1.75 ml

6. Rudolf is diagnosed with amoebiasis and is to receivedMetronidazole (Flagyl) tablets 1.5 gm daily in 3 divided dosesfor 7 consecutive days. Which of the following is the correctdose of the drug that the client will received per oraladministration? ( still no answer)

A. 1,000 mg tid

C. 1,500 mg tid

B.500 mg tid

D. 50 mg tid

7. Rhona, a 2 year old female was prescribed to receive 62.5 mgsuspension three times a day. The available dose is 125 mg/ml.which of the following should Nurse Paolo prepare for each oraldose? ( No Answer)

A.0.5 ml

C. 2.5 ml

B. 1.5 ml

D. 10 ml



Formulas:

Drug Computations 1

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