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Chapter 5

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Units Measures the drug in terms of action No symbol for units

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Sample problems - Answers Express the unit dosage in numerals and symbols: 1. Three hundred and fifty thousand units. A. 350,000 units 2. Twenty-five hundred units. A. 25,000 units 3. Sixty units. A. 60 units

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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.

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Sample Question Which is stronger, a 3% solution or a 6% solution? A. 3% B. 6%

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Which of the following is the correct abbreviation for “units”? A. Un B. U C. UN D. Ut E. None of the above

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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

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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

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100 mL of a 5% solution will contain how many grams of drug? A.1 g B.5 g C.10 g D.100 g E.None of the above

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But what if it is not 100 mL Mrs. Keele?

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Convert % to fraction

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What is the fraction of 7% A. 70 B. 7 C. 0.7 D. 0.07 E. 0.007

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What is the fraction of 60% A. 60 B. 6 C. 0.6 D. 0.06 E. None of the above

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250 mL of a 5% solution will contain how many grams of drug?

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325 mL of a 6% solution will contain how many grams of drug? A.18.5 g B.6 g C.16.25 g D.19.5 g E.None of the above

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120 mL of a 5.4% solution will contain how many grams of drug? A. 6.45 g B. 64.5 g C. 645 g D. None of the above E. I’m so lost I have no idea!

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260 mL of a 3% solution will contain how many grams of drug? A. 0.78 g B. 7.8 g C. 78 g D. 780 g E. None of the above

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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

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Sample Questions: Express the milliequivalent dosages in numbers and symbols: 1. Fifteen milliequivalents A. 15 mEq 2. Twenty-five milliequivalents A. 25 mEq 3. Forty-two milliequivalents A. 42 mEq

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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

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If I take 1 bottle of alcohol & add it to 2 bottles of soda 1:2 ratio How drunk would one glass of this spiked punch make you?

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If I take 1 bottle of alcohol & add it to 5 bottles of soda 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?

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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

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Identify the strongest solution: A) 1:20 B) 1:200 C) 1:2

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Identify the strongest solution: A) 1:50 B) 1:20 C) 1:100

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Identify the strongest solution: A) 1:1000 B) 1:4000 C) 1:3000

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Household & Apothecary measures Ounce Abbreviation: oz

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Household & Apothecary measures

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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)

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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)

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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)

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How many mL in 5 teaspoons? A. 5 mL B. 10 mL C. 15 mL D. 25 mL E. None of the above

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How many mL in 25 drops? A. 25 mL B. 50 mL C. 75 mL D. 100 mL E. None of the above

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The doctor says to give 2 oz, but you only have a mL cup. How much do you give in mL? A. 2 mL B. 15 mL C. 30 mL D. 60 mL E. None of the above

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How many milligrams in 3 grains? A. 50 mg B. 100 mg C. 150 mg D. 200 mg E. None of the above

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How many milliliters in 1 tablespoon? A. 5 mL B. 10 mL C. 15 mL D. 25 mL E. None of the above

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True / False: A 40% solution is stronger than a 30% solution. A. True B. False

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True / False: A 5% ointment is stronger than a 2% ointment. A. True B. False

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True / False: 100mL of a 3% solution will contain 30 grams of drug. A. True B. False

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2.8 mL of a 5.7% solution will contain how many grams of drug? (Round to the nearest tenth) A. 2.8 g B. 5.7 g C. 0.1 g D. 0.2 g E. None of the above

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