Pediatric Medication Calculations,
Calculation EXAM I, IV dosage
calculation practice Exam, HESI
Dosage Calculations Practice
Exam, Intravenous (IV)
calculations, Intravenous
Calculations WITH CORRECT
ANSWERS
convert :20 pounds 5 ounces to kilogram - ANSWER-1st: need to convert 5 ounces to a
fraction of a pound 5 divided by 16=0.31
2nd: 20.31 pounds divided by 2.2=9.23 kg
Note: medication would be calculated based on 9.23 kilograms
DO NOT ROUND TO 9.2
Pediatric specific Calculations - ANSWER-Mg / Kg dosing based on Weight (Kg)
Safe dosing ranges
IV pediatric infusion rates
IV administration of meds via IV pump or Syringe pump.
24 hour fluid calculation
child: 5 years: weight 44 lbs
order: famotidine (pepcid) 5 mg IV bid
Drug guide: 0.25 mg/Kg q 12 hr IV up to 40mg/day. - ANSWER-Convert lb t kg: 44 kg=
20 kg
Determine safe dose:
20 kg* 0.25 mg= 5 mg
5 mg is safe meets mg/kg rule and does not
Exceed 40 mg/day
5 mg bid= total of 10 mg/day
calculate dose pepcid is provided as 10 mg/ml - ANSWER-10 mg/1mL= 5 mg/ X mL
5/10x = 0.5 mL of Pepcid
The Physician order will never say to flush The line - ANSWER-YOU MUST DO THIS
WITH EACH IV MEDICATION
,A medication order: 1 L D-5-W IV q 8 h.
If the infusion pump (or administration set) delivers 10 drops/ml, calculate the infusion
rate in drops/min. - ANSWER-20.8 drops/min
How many fluid ounces (fl.oz,) Robitussin Cough Syrup are there in 2.5 L? - ANSWER-
84.5 fl. oz.
An ophthalmic solution contains 1 mg dexamethasone phosphate/mL. How many mg
dexamethasone phosphate are provided by 2 drops of the solution if the eye dropper
delivers 20 drops/mL? - ANSWER-0.1 mg
What does it mean when a substance has a specific gravity (Sp. Gr.) of 1.25? -
ANSWER-The ratio of the density of the substance to that of pure water is 1.25 : 1.
Given Info:
Glycerin = 10 mL
ZnO = 25 g
Ointment base qs 100 g
Sp.gr. of glycerin is 1.25
How many g ointment base need to be weighed? - ANSWER-62.5 g
Cocoa Butter (Theobroma Oil) suppository base has a sp. Gr. = 0.86. If 48 mL of melted
Cocoa Butter is needed to make a batch of suppositories, how many grams of unmelted
cocoa butter need to be weighed? - ANSWER-41.28 g
How many 0.000065 g doses can be prepared from 0.130 g of drug? - ANSWER-2000
doses
A RPh fills 3 compounded Rxs using the following quantities of hydromorphone HCl: 1/8
oz., ¼ oz, 1-1/2 oz. How many ounces of drug remain in the original container of 3 oz of
drug from which she withdrew the 3 amounts of drug? - ANSWER-9/8 oz.
or
1.125 oz.
A RPh had 5 g codeine phosphate which she used in filling 3 Rxs for capsules as
follows: viii caps each containing 0.0325 g; xii caps each containing 0.015 g; xviii caps
each containing 0.008 g. How much codeine phosphate remained in the RPh's
inventory? - ANSWER-4.416 g
,26 patients out of 2105 patients enrolled in a clinical research protocol reported a
headache after 1 dose of the investigational drug. What % of patients reported this
adverse event? - ANSWER-1.24%
An insulin product contains 100 u/mL. How many mL should be injected to provide 40
u? - ANSWER-0.4 mL
Lanoxin brand of digoxin pediatric elixir contains 0.05 mg dig/mL. If the Rx calls for 0.6
mL po, how many mg of digoxin is the patient receiving per dose? - ANSWER-0.03 mg
An industrial formulation specifies 3.25 g diazepam to prepare a batch of 1250 tabs.
How many g diazepam should be used to prepare 350 tablets? - ANSWER-0.91 g
A cough syrup contains 10 mg dextromethorphan HBr per tsp. How many mg of the
drug are contained in a 4 fl.oz. container? - ANSWER-If use 5 mL,
then 236.8 mg
If use 4.92 mL,
then 240.65 mg
An IV solution is adjusted to deliver 15 mg drug per hr. How many mg of the drug is the
patient receiving per minute? - ANSWER-0.25 mg/min
Filgrastim (Neupogen®), a biotech drug, is available in vials labeled 480 μg/0.8 mL. If a
patient receives an injection of 0.5mL, what dose (in μg) did the patient receive? -
ANSWER-300 mcg
A compounding operation calls for 50 tabs of 0.025 mg potency. The pharmacist only
has 0.1 mg strength tablets in stock. How many 0.1 mg tabs must be used to provide
the amount of active ingredient needed to compound this Rx? - ANSWER-12.5 tablets
An MDI contains 225 mg metaproterenol sulfate which is sufficient for 300 inhalations.
What dose does the patient receive with each inhalation? - ANSWER-0.75
mg/inhalation
A pediatric vitamin contains 1500 units Vitamin A/mL. An Rx for a child specifies 2 gtts.
daily. If the dropper delivers 20 drops per mL, what dose of Vitamin A is the child
receiving? - ANSWER-150 units
What does the abbreviation "gtts" mean? - ANSWER-drops
A 5 g packet of KCl granules provides 20 mEq of K ion. How many g would provide 6
mEq potassium ion? - ANSWER-1.5 g
, A PK study reveals that Cp values for ciprofloxacin exhibit dose proportionality. If a 250
mg single dose of ciprofloxacin results in a Cp of 1.2 μg/mL, what Cp would result from
a 500 mg dose of the antibiotic? - ANSWER-2.4 mcg/mL
0.5 mL mumps virus vaccine contains 5000u. How many units are present in each mL
once 0.5 mL of the vaccine is diluted 2 mL with SWFI? - ANSWER-2500 u/mL
A measurement designated as "325 grams" actually means some amount between
_____ grams and _____ grams. - ANSWER-320 and 330
If Acetaminophen in doses greater than 4 g/day is assumed to cause liver toxicity, what
is the maximum number of 500 mg tablets a patient may "safely" take per day? -
ANSWER-8 tablets/day
An Albuterol inhaler contains 20 mg. How many inhalation-doses can be delivered if
each contains 90 mcg. - ANSWER-222 doses
Adalimumab (a biotech drug) is available as a "prefilled syringe," containing 40 mg/0.8
mL. Calculate the concentration on a mg/mL basis. - ANSWER-50 mg/mL
Digoxin is available for parenteral pediatric use in a concentration of 0.1 mg/mL. How
would you obtain a dose of 40 μg? - ANSWER-0.4 mL
An IV solution containing 123 mg drug in each 250 mL bag is to be infused at a rate of
200 mcg/min. How many mL should be administered per hr? - ANSWER-24.4 mL/hr
An estradiol transdermal system is a round patch with a diameter of 4.3 cm. Express
this in mm. - ANSWER-43 mm
1 pound (lb) is equal to how many grams? - ANSWER-454 g
1 kg is equal to how many pounds? - ANSWER-2.2 lbs
The starting dose of chlorambucil is 150 mcg/kg. How many mg should be administered
to a frail 85 yo female who weighs 154 lb? - ANSWER-10.5 mg
If a cough syrup contains 0.09 g dextromethorphan HBr per fl.oz., how many mg of this
synthetic cough suppressant would the patient receive in a 1 tsp. dose? In a 1 tbsp.
dose? - ANSWER-15.2 mg
2 mg
An IV bolus injection contains 125 mg/25 mL. Express this as μg/μL. - ANSWER-5
mcg/mcL
Calculation EXAM I, IV dosage
calculation practice Exam, HESI
Dosage Calculations Practice
Exam, Intravenous (IV)
calculations, Intravenous
Calculations WITH CORRECT
ANSWERS
convert :20 pounds 5 ounces to kilogram - ANSWER-1st: need to convert 5 ounces to a
fraction of a pound 5 divided by 16=0.31
2nd: 20.31 pounds divided by 2.2=9.23 kg
Note: medication would be calculated based on 9.23 kilograms
DO NOT ROUND TO 9.2
Pediatric specific Calculations - ANSWER-Mg / Kg dosing based on Weight (Kg)
Safe dosing ranges
IV pediatric infusion rates
IV administration of meds via IV pump or Syringe pump.
24 hour fluid calculation
child: 5 years: weight 44 lbs
order: famotidine (pepcid) 5 mg IV bid
Drug guide: 0.25 mg/Kg q 12 hr IV up to 40mg/day. - ANSWER-Convert lb t kg: 44 kg=
20 kg
Determine safe dose:
20 kg* 0.25 mg= 5 mg
5 mg is safe meets mg/kg rule and does not
Exceed 40 mg/day
5 mg bid= total of 10 mg/day
calculate dose pepcid is provided as 10 mg/ml - ANSWER-10 mg/1mL= 5 mg/ X mL
5/10x = 0.5 mL of Pepcid
The Physician order will never say to flush The line - ANSWER-YOU MUST DO THIS
WITH EACH IV MEDICATION
,A medication order: 1 L D-5-W IV q 8 h.
If the infusion pump (or administration set) delivers 10 drops/ml, calculate the infusion
rate in drops/min. - ANSWER-20.8 drops/min
How many fluid ounces (fl.oz,) Robitussin Cough Syrup are there in 2.5 L? - ANSWER-
84.5 fl. oz.
An ophthalmic solution contains 1 mg dexamethasone phosphate/mL. How many mg
dexamethasone phosphate are provided by 2 drops of the solution if the eye dropper
delivers 20 drops/mL? - ANSWER-0.1 mg
What does it mean when a substance has a specific gravity (Sp. Gr.) of 1.25? -
ANSWER-The ratio of the density of the substance to that of pure water is 1.25 : 1.
Given Info:
Glycerin = 10 mL
ZnO = 25 g
Ointment base qs 100 g
Sp.gr. of glycerin is 1.25
How many g ointment base need to be weighed? - ANSWER-62.5 g
Cocoa Butter (Theobroma Oil) suppository base has a sp. Gr. = 0.86. If 48 mL of melted
Cocoa Butter is needed to make a batch of suppositories, how many grams of unmelted
cocoa butter need to be weighed? - ANSWER-41.28 g
How many 0.000065 g doses can be prepared from 0.130 g of drug? - ANSWER-2000
doses
A RPh fills 3 compounded Rxs using the following quantities of hydromorphone HCl: 1/8
oz., ¼ oz, 1-1/2 oz. How many ounces of drug remain in the original container of 3 oz of
drug from which she withdrew the 3 amounts of drug? - ANSWER-9/8 oz.
or
1.125 oz.
A RPh had 5 g codeine phosphate which she used in filling 3 Rxs for capsules as
follows: viii caps each containing 0.0325 g; xii caps each containing 0.015 g; xviii caps
each containing 0.008 g. How much codeine phosphate remained in the RPh's
inventory? - ANSWER-4.416 g
,26 patients out of 2105 patients enrolled in a clinical research protocol reported a
headache after 1 dose of the investigational drug. What % of patients reported this
adverse event? - ANSWER-1.24%
An insulin product contains 100 u/mL. How many mL should be injected to provide 40
u? - ANSWER-0.4 mL
Lanoxin brand of digoxin pediatric elixir contains 0.05 mg dig/mL. If the Rx calls for 0.6
mL po, how many mg of digoxin is the patient receiving per dose? - ANSWER-0.03 mg
An industrial formulation specifies 3.25 g diazepam to prepare a batch of 1250 tabs.
How many g diazepam should be used to prepare 350 tablets? - ANSWER-0.91 g
A cough syrup contains 10 mg dextromethorphan HBr per tsp. How many mg of the
drug are contained in a 4 fl.oz. container? - ANSWER-If use 5 mL,
then 236.8 mg
If use 4.92 mL,
then 240.65 mg
An IV solution is adjusted to deliver 15 mg drug per hr. How many mg of the drug is the
patient receiving per minute? - ANSWER-0.25 mg/min
Filgrastim (Neupogen®), a biotech drug, is available in vials labeled 480 μg/0.8 mL. If a
patient receives an injection of 0.5mL, what dose (in μg) did the patient receive? -
ANSWER-300 mcg
A compounding operation calls for 50 tabs of 0.025 mg potency. The pharmacist only
has 0.1 mg strength tablets in stock. How many 0.1 mg tabs must be used to provide
the amount of active ingredient needed to compound this Rx? - ANSWER-12.5 tablets
An MDI contains 225 mg metaproterenol sulfate which is sufficient for 300 inhalations.
What dose does the patient receive with each inhalation? - ANSWER-0.75
mg/inhalation
A pediatric vitamin contains 1500 units Vitamin A/mL. An Rx for a child specifies 2 gtts.
daily. If the dropper delivers 20 drops per mL, what dose of Vitamin A is the child
receiving? - ANSWER-150 units
What does the abbreviation "gtts" mean? - ANSWER-drops
A 5 g packet of KCl granules provides 20 mEq of K ion. How many g would provide 6
mEq potassium ion? - ANSWER-1.5 g
, A PK study reveals that Cp values for ciprofloxacin exhibit dose proportionality. If a 250
mg single dose of ciprofloxacin results in a Cp of 1.2 μg/mL, what Cp would result from
a 500 mg dose of the antibiotic? - ANSWER-2.4 mcg/mL
0.5 mL mumps virus vaccine contains 5000u. How many units are present in each mL
once 0.5 mL of the vaccine is diluted 2 mL with SWFI? - ANSWER-2500 u/mL
A measurement designated as "325 grams" actually means some amount between
_____ grams and _____ grams. - ANSWER-320 and 330
If Acetaminophen in doses greater than 4 g/day is assumed to cause liver toxicity, what
is the maximum number of 500 mg tablets a patient may "safely" take per day? -
ANSWER-8 tablets/day
An Albuterol inhaler contains 20 mg. How many inhalation-doses can be delivered if
each contains 90 mcg. - ANSWER-222 doses
Adalimumab (a biotech drug) is available as a "prefilled syringe," containing 40 mg/0.8
mL. Calculate the concentration on a mg/mL basis. - ANSWER-50 mg/mL
Digoxin is available for parenteral pediatric use in a concentration of 0.1 mg/mL. How
would you obtain a dose of 40 μg? - ANSWER-0.4 mL
An IV solution containing 123 mg drug in each 250 mL bag is to be infused at a rate of
200 mcg/min. How many mL should be administered per hr? - ANSWER-24.4 mL/hr
An estradiol transdermal system is a round patch with a diameter of 4.3 cm. Express
this in mm. - ANSWER-43 mm
1 pound (lb) is equal to how many grams? - ANSWER-454 g
1 kg is equal to how many pounds? - ANSWER-2.2 lbs
The starting dose of chlorambucil is 150 mcg/kg. How many mg should be administered
to a frail 85 yo female who weighs 154 lb? - ANSWER-10.5 mg
If a cough syrup contains 0.09 g dextromethorphan HBr per fl.oz., how many mg of this
synthetic cough suppressant would the patient receive in a 1 tsp. dose? In a 1 tbsp.
dose? - ANSWER-15.2 mg
2 mg
An IV bolus injection contains 125 mg/25 mL. Express this as μg/μL. - ANSWER-5
mcg/mcL
