Dimensional Analysis

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Dimensional Analysis - PowerPoint PPT Presentation

Dimensional Analysis. Chapter 5. Units. Measures the drug in terms of action No symbol for units. Sample problems - Answers. Express the unit dosage in numerals and symbols: Three hundred and fifty thousand units. 350,000 units Twenty-five hundred units. 25,000 units Sixty units.

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Dimensional Analysis

Chapter 5

Units
• Measures the drug in terms of action
• No symbol for units
• Express the unit dosage in numerals and symbols:
• Three hundred and fifty thousand units.
• 350,000 units
• Twenty-five hundred units.
• 25,000 units
• Sixty units.
• 60 units
Percentage (%) measures
• Percentage means parts per hundred.
• No space between the # and the %
• 1% not 1 %
• The greater the percentage strength, the stronger the solution or ointment.
Sample Question
• Which is stronger, a 3% solution or a 6% solution?
• 3%
• 6%
• Un
• U
• UN
• Ut
• None of the above
Percentage (%) measures
• In solution, percent represents the number of grams of drug per 100 mL of solution.
• 100 mL of a 1% solution will contain 1 g of drug
Sample Questions
• 100 mL of a 1% solution will contain how many grams of drug?
• 1 g
• 100 mL of a 2.5% solution will contain how many grams of drug?
• 2.5 g
• 100 mL of a 10% solution will contain how many grams of drug?
• 10 g
Convert % to fraction
• To change percentage to fraction by 100
• 5% =
What is the fraction of 60%
• 60
• 6
• 0.6
• 0.06
• None of the above
• 6.45 g
• 64.5 g
• 645 g
• None of the above
• I’m so lost I have no idea!
Milliequivalent (mEq) measures
• Number of grams of drug contained in 1 mL of a solution
• Who cares?
• Not you
• What do I need to know
• -mEq = milliequivalent
Sample Questions:
• Express the milliequivalent dosages in numbers and symbols:
• Fifteen milliequivalents
• 15 mEq
• Twenty-five milliequivalents
• 25 mEq
• Forty-two milliequivalents
• 42 mEq
Ratio Measures
• Parts of drug per parts of solution
• 1:500
• 1 part drug to 500 parts solution
• 1:20
• 1 part drug to 20 parts solution
• A solution that is 1 part drug and 10 parts solution is written:
• 1:10
• 1:2 ratio
• How drunk would one glass of this spiked punch make you?
• 1:5 ratio
• How drunk would one glass of this spiked punch make you?
• Which would make you more drunk 1:2 or 1:5?
Ratio Measures
• The less solution a drug is dissolved in, the stronger the solution.
• A ratio of 1:2 is much stronger than 1:5
• A ration of 1:5 is much stronger than a 1:500
Identify the strongest solution:
• A) 1:20
• B) 1:200
• C) 1:2
Identify the strongest solution:
• A) 1:50
• B) 1:20
• C) 1:100
Identify the strongest solution:
• A) 1:1000
• B) 1:4000
• C) 1:3000
Household & Apothecary measures
• Ounce
• Abbreviation: oz
Household & Apothecary measures
• Ounce
• Metric equivalent: 30 mL
• 1 oz = 30 mL
• How many milliliters in 3 oz?
• 90 mL
• mL
Household & Apothecary measures
• Tablespoon
• Abbreviation: T, TBS, Tbsp
• Metric equivalent: 15 mL
• 1 Tbsp.= 15 mL
• How many milliliters in 3 Tbsp?
• 45 mL (3 x 15 = 45)
• = 45mL
Household & Apothecary measures
• Teaspoon
• Abbreviation: t, TSP, tsp
• Metric equivalent: 5 mL
• So 1 tsp = 5 mL
• How many milliliters in 3 tsp?
• 15 mL (3 tsp x 5 mL = 15 mL)
Household & Apothecary measures
• Drop
• Abbreviation: gtt (gtts)
• Metric equivalent: 1 mL
• So 1 gtt = 1 mL
• How many milliliters in 3 gtts?
• 3 mL (3 x 1 = 3)
Household & Apothecary measures
• Grain
• Abbreviation: gr
• Metric equivalent: 60 mg
• 1 gr = 60 mg
• How many milligrams in 3 gr?
• 180 mg (3 x 60 = 180)
• (For grains see page 306 of your text book)
How many mL in 5 teaspoons?
• 5 mL
• 10 mL
• 15 mL
• 25 mL
• None of the above
How many mL in 25 drops?
• 25 mL
• 50 mL
• 75 mL
• 100 mL
• None of the above
The doctor says to give 2 oz, but you only have a mL cup. How much do you give in mL?
• 2 mL
• 15 mL
• 30 mL
• 60 mL
• None of the above
How many milligrams in 3 grains?
• 50 mg
• 100 mg
• 150 mg
• 200 mg
• None of the above
How many milliliters in 1 tablespoon?
• 5 mL
• 10 mL
• 15 mL
• 25 mL
• None of the above
• True
• False
• True
• False
2.8 mL of a 5.7% solution will contain how many grams of drug? (Round to the nearest tenth)
• 2.8 g
• 5.7 g
• 0.1 g
• 0.2 g
• None of the above