Drug Calculations
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drug calculations for nurses
Transcript of Drug Calculations
µgMicrograms should be written out, insist on
it!
__ ss or ss
Write out one-half or 1/2 clearly.
ODOrdered daily? Write out daily. QD, if legible,
should be acceptable.
n or NNightly? QN? Write out nightly or use hs.
d or DDaily? Write out how many days.
BTOrdered at bedtime? Write out bedtime or
use the standard hs.
Example
Doctor's order:0.25 mg of digoxin p.o. On hand: 0.5 mg tablets
Answer
نصف 1 تعادل حبةملغ
تعادل حبة 0.25كمملغ
حبة = كم
1 X 0.25
0.5
Example
Doctor's order:Give deltasone 7.5 mg PO now.Available : deltasone 2.5 mg tablet.
Answer
AVAILABLE حاليا المتوفر
Example
Doctor's order:Give ranitidine 40 mg PO ABT.Available is ranitidine 20 mg tabletHow many tablet you should give?
Answer
Example
Doctor's order:Give 7500 i.u of heparin injection S/C .Available:( heparin injection 5000 i.u/ml)How many ml you should give?
Answer
Example
Doctor's order:Give 500 cc D5RL to be infused in 6 hrs. You should regulate the I.V at:
Answer
Example
Doctor's order:Give 1500 cc normal saline over 4 hrs. You should regulate the I.V at:
Answer
Example
Doctor's order:Give 1000 cc dextrose 5% I.V Q 8 hrs. You should regulate the I.V at:
Answer
Example
Doctor's order:Give 3 L of I.V fluid 5% D/0.45% normal saline
over 24 hrs.(the drop factor is 60 gtt/ml). You should regulate the I.V at:
Answer
Example
Doctor's order:Give 3000 cc dextrose 5% I.V Q 6 hrs, drop
factor is 20 gtt/m)How many drops should you give per minute?
Answer
Example
Doctor's order:Give penicillin 600.000 u I.M statAvailable: (penicillin 800.000 u/2 cc)How many ml should you give?
Answer
Example
Doctor's order:Give G/S 2000 cc I.V Q 24 hrs,The rate will be how many drop per minute?
Answer
Example
• The physician orders IV fluids to hydrate a client. The order is written as "D5NS 4 Liters over 24 hours." Looking at the package indicates the drip factor of the tubing is 15 gtt/ml. What is the drip rate?
Answer
Shortcut method when you know the ordered ml/hr:
15 gtt/ml: divide the ml/hr by 4
10 gtt/ml (typically blood products): divide ml/hr by 6
20 gtt/ml: divide ml/hr by 3
175 / 4=43.75 gtt/min
175 / 6=29.16 gtt/min
175 / 3=58.33 gtt/min
Example •The client's K+ is 2.0 mEq/dl and the physician
orders a potassium bolus of 40 mEq of KCl in 200 ml of NS to be delivered at a rate of 10
mEq/hr. What is the drip rate in microdrops? (Ideal, deliver on a pump.)
Answer
Calculating flow rate
• Flow rate refers to number of ml of fluid to be infused over one hour (ml/hr).
total # of milliliters (volume) total # of hours =X ml/hr
Example
• The nurse makes rounds and notes that the current IV bag contains approximately 450 ml. The IV flow rate is 150 ml/hr. How long will it be before the nurse must hang a new bag?
Answer
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Example
• Order: Administer 1000 cc at 50 gtt/min.
Answer
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Example
• John is to receive Cleocin 150 mg IV q 8 hours. The nurse dilutes the medication to a total volume of 30 ml and plans to deliver it via an infusion pump over thirty minutes. What would be the flow rate?
Answer
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Example
• For the client whose weight is 130 lbs and has dopamine ordered at 8 mcg/kg/min, what rate should the infusion pump be set for a solution of 400 mg dopamine in 250 ml D5W?
Answer
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Example
• A client is receiving dopamine at 12 ml/hr. The solution hanging indicates "D5W 250 ml/200 mg dopamine". The client weighs 133 lbs. What is the dosage (mcg/kg/min) the client is receiving?
Answer
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Example
• A client is receiving a heparin drip at 22 ml/hr via an infusion pump. The label on the liter bag of D5W indicates 40,000 U of heparin. How many units of heparin does the client receive per hour?
Answer
Example
• The physician becomes concerned about John’s renal function and orders the Vancomycin dose (60 mg) to be infused over 90 minutes instead of the usual 60 minutes. If the Vancomycin dosage is diluted into 60 ml of IV fluid, what will be the flow rate? (Given on an IV pump for control.)
Answer
Example • John's primary IV is running at 34 ml/hr while NPO. When
the nurse runs the Vancomycin (250 mg IV q 8 hr) in over 90 minutes [volume is 100 ml--(2 50 ml syringes)], the primary IV is stopped. The ampicillin (395 mg IV q 6 hr) is given concurrently in 10 ml of fluid over 30 minutes. He received 2 boluses of aminophylline (20 ml each over 20 minutes). The IV fluids were stopped while the aminophylline infused. Since microtubing was used for the medications, total flush is negligible (approximately 3 ml). What is John’s total intake for 24 hours?
Answer
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Example • Crystal has an IV infusing at KVO (10 ml/hr). She
receives an antibiotic in 22.5 ml q 8° concurrently. One ml flush is given after each antibiotic. She is given 30 ml of formula q 3°.
• She had diaper weights of 17 ml, 33 ml, 55 ml, 45 ml, 52 ml, 50 ml, 15 ml, and 36 ml.
• Calculate her I & O for the past 24 hours.
Answer
Example
• John also has an order for ampicillin sodium 395 mg IV q 6 hr. The safe range for his type of infection in the literature is 100-200 mg /kg /day. Is this a safe dose?
Answer
Example • The physician stopped John’s gentamicin and
cleocin when the culture report came back. His new orders include Vancomycin 250 mg IV q 8°. The literature indicates that the minimal dilution concentration for infusion should be 2.5 mg / ml if given through a peripheral intravenous line (PIV). How many ml of diluent will the nurse need to mix the Vancomycin to meet this safety requirement?
Answer
Example
• A newborn has an order for 0.15 micrograms of Prostin VR (alprostadil) per hour to maintain patency of the ductus arteriosus. The pharmacy prepared a Prostin drip with 25 mcg alprostadil in 50 ml of D5W. What hourly rate is needed to deliver the dosage of medication as ordered?
Answer
Example
• John is to be given an Aminophylline bolus of 30 mg in 20 ml of fluid over 20 minutes. The primary IV is running at 40 ml/hr. The drip factor of the tubing (buretrol) is 60 gtts/cc or minidrip. What is the flow rate needed to deliver the Aminophylline bolus as ordered?
Answer
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Example
• John is a pediatric client in a hospital in which the policy is to place all children on IV therapy on a buretrol and to only fill the buretrol no more than two-three hours worth of fluid. The nurse fills the buretrol to 90 ml at 10 a.m. If John’s IV is running at 34 ml per hour, how long will it be before the nurse will need to fill it again?
Answer
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