10/11/25, 9:34 AM Pharmacy Calculations Exam Questions and Answers 100% Pass |Verified and Updated Flashcards | Quizlet
Pharmacy Calculations Exam Questions and
Answers 100% Pass |Verified and Updated
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Terms in this set (116)
• The amount of medication to be administered to
a patient.
Dose
• May be measured in milligrams (mg), milliliters
(mL), units, or milliequivalents (mEq).
To convert a decimal to percent:
1. Multiply the number by 100.
2. Add a percent (%) sign.
How to convert a decimal
to percent Examples:
• 0.45 * 100 = 45%
• 1.00 * 100 = 100%
• 1.25 * 100 = 125%
To convert a percent to decimal:
1. Remove the % sign.
2. Divide by 100.
How to convert a percent
Examples:
to decimal
• 95% / 100 = 0.95
• 50% / 100 = 0.50
• 0.25% / 100 = .0025
• 105% / 100 = 1.05
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1• Drop the % sign.
2• Write the value of the number as the
numerator.
3• Place number over a denominator of 100.
How to convert a percent
4• Reduce the fraction to its lowest terms.
to a fraction
Example: 75%
= --> (both divisible by 25)
=3/4
• Percent means "parts per 100".
Percentages and
• Can calculate using ratios, fractions, or
medication strength
decimals.
• Place the numerator first.
• Followed by a colon.
• Place the denominator next.
How to convert a fraction
to a ratio
Example:
• 1/2 is "1 over 2"
• 1 : 2 is "1 to 2"
Parts of the whole ÷ Whole = Percent (%) ÷ 100
To solve:
1. Two of the three variables need to be present:
Calculate percent by parts of the whole, the whole, or the percent.
setting up a proportion 2. Identify each term as part of the whole, the
whole, or a percent.
3. Place values in the equation.
4. Cross multiply across the equal sign.
5. Divide to find the missing term.
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1• Divide the first number by the second number.
2• Multiply by 100.
3• Add the % sign.
How to convert a ratio to Example:
a percent • 1 : 10
= 1/10 = 0.10
= 0.10 * 100
= 10
= 10%
Dose to be given = [ DD (Desired dose) / DH
(dose on hand) ] * QTY (quantity)
Example: How many 1 tsp doses are in a 4 oz.
bottle of Prozac Liquid Solution 20 mg/5mL?
Given: 120 mL = 4 oz.
1 oz = 30 mL
1 tsp = 5 mL
1. Convert oz. to mL
How to calculate the
• 1 oz. / 30 mL = 4 oz. / X mL
number of doses in a
• 1 * X = 30 * 4
prescription (Option 1)
• X = 120 mL
2. Solve for the number of doses
• 1 dose / 5 mL = X doses / 120 mL
• 5 * X = 1 * 120
• 5X = 120
• X =
• X = 24 doses
There are 24 doses (of 5 mL each) in a 4 oz. (120
mL) bottle.
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How many 1 tsp doses are in a 4 oz. bottle Prozac
Liquid Solution 20 mg/5mL?
Given:
120 mL = 4 oz.
How to calculate the
1 oz = 30 mL
number of doses in a
1 tsp = 5 mL
prescription (Example
Option 2 - dimensional
X = 4 oz * (30 ml / 1 oz.) * (1 tsp / 5 ml)
analysis)
X = (4 * 30 tsp) / 5
X = 120 tsp / 5
X = 24 tsp
24 tsp are in a 4 oz. bottle
Always use the higher dosage amount when
performing dosage calculations on prescriptions
that have a range for the dose.
Rx (Prescription): "Ibupropfen 400 mg
i - ii po q 6hr prn pain
Disp. #120"
Dosage amount to Solve:
calculate doses • Assume the most conservative usage of 2
tablets every 6 hours and not 1 tablet every 6
hours.
• (1 dose / 2 tabs) = ( X doses / 120 tabs)
• 2 * X = 1 * 120
• X =
• 60
• A minimum of 60 doses has been prescribed.
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Pharmacy Calculations Exam Questions and
Answers 100% Pass |Verified and Updated
Save
Terms in this set (116)
• The amount of medication to be administered to
a patient.
Dose
• May be measured in milligrams (mg), milliliters
(mL), units, or milliequivalents (mEq).
To convert a decimal to percent:
1. Multiply the number by 100.
2. Add a percent (%) sign.
How to convert a decimal
to percent Examples:
• 0.45 * 100 = 45%
• 1.00 * 100 = 100%
• 1.25 * 100 = 125%
To convert a percent to decimal:
1. Remove the % sign.
2. Divide by 100.
How to convert a percent
Examples:
to decimal
• 95% / 100 = 0.95
• 50% / 100 = 0.50
• 0.25% / 100 = .0025
• 105% / 100 = 1.05
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,10/11/25, 9:34 AM Pharmacy Calculations Exam Questions and Answers 100% Pass |Verified and Updated Flashcards | Quizlet
1• Drop the % sign.
2• Write the value of the number as the
numerator.
3• Place number over a denominator of 100.
How to convert a percent
4• Reduce the fraction to its lowest terms.
to a fraction
Example: 75%
= --> (both divisible by 25)
=3/4
• Percent means "parts per 100".
Percentages and
• Can calculate using ratios, fractions, or
medication strength
decimals.
• Place the numerator first.
• Followed by a colon.
• Place the denominator next.
How to convert a fraction
to a ratio
Example:
• 1/2 is "1 over 2"
• 1 : 2 is "1 to 2"
Parts of the whole ÷ Whole = Percent (%) ÷ 100
To solve:
1. Two of the three variables need to be present:
Calculate percent by parts of the whole, the whole, or the percent.
setting up a proportion 2. Identify each term as part of the whole, the
whole, or a percent.
3. Place values in the equation.
4. Cross multiply across the equal sign.
5. Divide to find the missing term.
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1• Divide the first number by the second number.
2• Multiply by 100.
3• Add the % sign.
How to convert a ratio to Example:
a percent • 1 : 10
= 1/10 = 0.10
= 0.10 * 100
= 10
= 10%
Dose to be given = [ DD (Desired dose) / DH
(dose on hand) ] * QTY (quantity)
Example: How many 1 tsp doses are in a 4 oz.
bottle of Prozac Liquid Solution 20 mg/5mL?
Given: 120 mL = 4 oz.
1 oz = 30 mL
1 tsp = 5 mL
1. Convert oz. to mL
How to calculate the
• 1 oz. / 30 mL = 4 oz. / X mL
number of doses in a
• 1 * X = 30 * 4
prescription (Option 1)
• X = 120 mL
2. Solve for the number of doses
• 1 dose / 5 mL = X doses / 120 mL
• 5 * X = 1 * 120
• 5X = 120
• X =
• X = 24 doses
There are 24 doses (of 5 mL each) in a 4 oz. (120
mL) bottle.
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, 10/11/25, 9:34 AM Pharmacy Calculations Exam Questions and Answers 100% Pass |Verified and Updated Flashcards | Quizlet
How many 1 tsp doses are in a 4 oz. bottle Prozac
Liquid Solution 20 mg/5mL?
Given:
120 mL = 4 oz.
How to calculate the
1 oz = 30 mL
number of doses in a
1 tsp = 5 mL
prescription (Example
Option 2 - dimensional
X = 4 oz * (30 ml / 1 oz.) * (1 tsp / 5 ml)
analysis)
X = (4 * 30 tsp) / 5
X = 120 tsp / 5
X = 24 tsp
24 tsp are in a 4 oz. bottle
Always use the higher dosage amount when
performing dosage calculations on prescriptions
that have a range for the dose.
Rx (Prescription): "Ibupropfen 400 mg
i - ii po q 6hr prn pain
Disp. #120"
Dosage amount to Solve:
calculate doses • Assume the most conservative usage of 2
tablets every 6 hours and not 1 tablet every 6
hours.
• (1 dose / 2 tabs) = ( X doses / 120 tabs)
• 2 * X = 1 * 120
• X =
• 60
• A minimum of 60 doses has been prescribed.
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