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Calculating Drug Doses - RAU's Ch 4: Questions and Answers, Exams of Pharmacology

A series of questions and answers related to drug dosage calculations, covering topics such as solution strength, conversion of units, and calculating drug doses based on patient weight. It includes practical examples and step-by-step solutions to help students understand the concepts and apply them to real-world scenarios.

Typology: Exams

2024/2025

Available from 11/07/2024

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Calculating Drug Doses - RAU's Ch 4
Questions and Answers.
The amount of solute in a solution, usually expressed as a percentage, is
called the - Correct Answer strength.
The amount of solute that is in a solution containing 100 parts is the -
Correct Answer Percentage.
A physically homogeneous mixture of two or more substances is called a(n)
- Correct Answer Solution
A ______ is a substance that is dissolved in a solution - Correct Answer
Solute.
A substance, usually a liquid, that is used to make a solution is called a -
Correct Answer Solvent.
The amount of drug that is needed, based on a patient's weight, is called -
Correct Answer Schedule.
51 cm = - Correct Answer 510 mm
33 g = - Correct Answer 3300 mg
24 mL = - Correct Answer 0.024 L
17 m = - Correct Answer 1700 cm
68 kg = - Correct Answer 68,000 g
2 teaspoons = - Correct Answer 120 drops
How many drops are in 1.0 mL? - Correct Answer 12
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Calculating Drug Doses - RAU's Ch 4

Questions and Answers.

The amount of solute in a solution, usually expressed as a percentage, is called the - Correct Answer strength. The amount of solute that is in a solution containing 100 parts is the - Correct Answer Percentage. A physically homogeneous mixture of two or more substances is called a(n)

  • Correct Answer Solution A ______ is a substance that is dissolved in a solution - Correct Answer Solute. A substance, usually a liquid, that is used to make a solution is called a - Correct Answer Solvent. The amount of drug that is needed, based on a patient's weight, is called - Correct Answer Schedule. 51 cm = - Correct Answer 510 mm 33 g = - Correct Answer 3300 mg 24 mL = - Correct Answer 0.024 L 17 m = - Correct Answer 1700 cm 68 kg = - Correct Answer 68,000 g 2 teaspoons = - Correct Answer 120 drops How many drops are in 1.0 mL? - Correct Answer 12

Drug A comes in 200 mg tablets. A dose of 500 mg/day is prescribed. How many tablets should the patient take? - Correct Answer Original dose = 200 mg (amount in 1 tablet) Per amount = 1 tablet Desired dose = 500 mg Per amount = x tablets 500(1) = 200 (x) 500 = 200 (x) x = 2.5 tablets You are ordered to give 6 mg of dextromethorphan hydrobromide. How many milliliters of dextromethorphan hydrobromide should be given? - Correct Answer Original dose = 10 mg Per amount = 5 mL Desired dose = 6 mg Per amount = x mL 10(x) = 5(6) x = 3 mL If there is 100 mg of drug in 50 mL of elixir and you want to give a 10 mg dose, how many milliliters of elixir should be given? - Correct Answer Original dose = 100 mg Per amount = 50 mL Desired dose = 10 mg Per amount = x (mL) Cross multiply 100 mg(x) = 500 mL/mg x = 5 mL How many milliliters do you need to give to deliver 650 U of heparin? - Correct Answer Original dose = 1000 units Per amount = 1 mL Desired dose = 650 units Per amount = x mL 1000(x) = (650) L 1000(x) = 650 x = 0.65 mL Insulin has a standard preparation of 1 unit - Correct Answer 0.04 mg.

Next find the number of milliliters required to achieve this dose Original dose = 100 mg/5 mL Desired dose = 100 mg Amount needed = x 100 mg (x) = 100 mg (5 mL) x = 5 mL Based on the weight of the newborn, prepared strength, and dosing schedule, 5 mL will give the needed dose of 100 mg. To achieve a homogenous solution, a ________ is dissolved in a _________. - Correct Answer Solute, Solvent. What percent strength is a 1:100 solution of a drug? - Correct Answer 1/100 = 0.01, which is 1% mg Percent strength = 1:250 = 0. Total amount of solution = 5 mL Active ingredient = x 0.004 = x/5 mL x g = 0.004 X 5 = 0.02 g active ingredient, or 20 mg. How many milligrams of active ingredient are in 5 mL of a 1:250 drug? - Correct Answer Percent strength = 1:250 = 0. Total amount of solution = 5 mL Active ingredient = x 0.004 = x/5 mL x g = 0.004 5 = 0.02 g active ingredient, or 20 mg. A patient needs 3 mL of 10% Mucomyst, but only 20% Mucomyst is available. How much 20% Mucomyst should be used? - Correct Answer Percent strength (in decimals) = 0. Total amount of solution = 3 mL Percent strength of solute = 0. Dilute solute (active ingredient) = x mL 0.10 = x(0.20) / 3 mL x(0.20) = 0.10 X 3 x(0.20) = 0.

x = 0.3 / 0.20 = 1.5 mL of 20% Mucomyst If you have 2.5 mL of a 20% solution and mix it with 2.5 mL of normal saline for a total of 5 mL, what will be the percent solution? - Correct Answer 10% (this is a half-half mixture) Although the definition of percentage strength is solution involves grams or milliliters, the amount of active ingredient in most nebulized drug solutions is in - Correct Answer Milligrams. Complete the following medication calculations. - Correct Answer Percent Strength (%) / Drug Amount (mg/mL) a. 20% / 200 b. 10% / 100 c. 0.5% / 5 d. 0.0% / 0. Convert from gram to percent strength to mg/mL. - Correct Answer Grams (g) / Percent Strength (%) / Drug Amount (mg/mL) a. 0.001 g / 0.1% / 1 b. 0.002 g / 0.2% / 2 c. 0.003 g / 0.3% / 3 If you have 2 mL of a 1% solution of a drug, how many milligrams is the active ingredient? - Correct Answer 0.01 = 0.01 (2 cc) = x g x = 0.02 g Now convert grams to milligrams 0.02 X 1000 mg/g = 20 mg. What is the amount of active ingredient in 0.5% strength albuterol that has a usual dose of 0.5 mL? - Correct Answer 0.005 = x g = 0.005 (0.5) = 0.0025 g 0.0025 g = 2.5 mg Using the equation for percentage strength on page 70 of the textbook, calculate the amount of albuterol in mg/mL if you had a 0.5% strength solution. - Correct Answer 5 mg/mL or 5 mg per 1 mL of solution

b. 60 c. 50 d. 20 - Correct Answer a. 40 The physician's order reads, "Instill 5mL 5% NaHCO3 q4h and prn." The pharmacy has 50-mL ampoules of an 8.4% solution. How many milliliters of distilled water must be added to make a 5% solution? a. 10 b. 21 c. 34 d. 42 - Correct Answer c. 34 The physician's order reads, "Administer 75mg Decadron via hand-held nebulizer." How many milliliters of a 2.5% solution should you use? a. 2. b. 0. c. 3 d. 1.5 - Correct Answer c. 3 The amount of drug that is needed, based on a patient's weight, is called: a. solution b. body weight proportion c. schedule d. active ingredient - Correct Answer c. schedule What is the percent strength of a drug available at 50mg/mL? a. 1 b. 5 c. 10 d. 15 - Correct Answer b. 5 The usual dose of albuterol sulfate is 0.5mL of a 0.5% strength solution. How many milligrams is this? a. 5. b. 2. c. 1. d. 0.50 - Correct Answer b. 2.

Surfactant has been ordered to be delivered to a premature newborn infant weighing 1.2kg. What dose should be delivered for a dosage schedule of 5mL/kg of body weight? a. 6mL b. 5mL c. 3mL d. 2.5mL - Correct Answer a. 6 mL A patient has been administered 2g of a drug per 100mL of solution. This would indicate the patient has received which of the following strength solutions? a. 3% b. 1% c. 2% d. 0.5% - Correct Answer d. 0.5% A patient has just completed a walk down the hospital hallway to determine the oxygen saturation during exercise. The patient walked 1500cm. How many meters did the patient walk? a. 1. b. 5 c. 15 d. 20 - Correct Answer c. 15 A prescription for an oral medication for a 3-year-old child states to give 1 teaspoon every 8 hours. The mother decides to use a syringe to obtain the medication to five a more exact dosage. How many milliliters of a drug should be given. a. 1 b. 3 c. 5 d. 6 - Correct Answer c. 5 A patient needs 0.5g of a drug every 8 hours. If each tablet contains a strength of 250mg, how many tablets should the person take? a. 1 b. 2 c. 2. d. 1.5 - Correct Answer b. 2