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question 18
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a patient requires 3 g of a drug. the tablets that are in stock are 500 mg/tablet. you give tablet(s).
type your answer in decimal form if necessary, do not use fractions.
question 19
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your patient is to receive 25 mg of a drug. the stock is labelled 125 mg/5 ml. you give ml.
type your answer in decimal form if necessary, do not use fractions.
question 20
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you mix a powdered drug with 4.5 ml of liquid to get a reconstituted solution with a concentration of 250 mg/ml. the prescribers order is for 500 mg. you will give ml of the reconstituted solution.
type your answer in decimal form if necessary, do not use fractions.
question 21

Explanation:

Question 18

Step1: Convert grams to milligrams

Since \(1\space g = 1000\space mg\), then \(3\space g = 3\times1000 = 3000\space mg\).

Step2: Calculate number of tablets

Number of tablets \(=\frac{\text{Required drug amount}}{\text{Drug amount per tablet}}=\frac{3000\space mg}{500\space mg/tablet}\)
\( = 6\)

Step1: Find the concentration per mL

The stock is \(125\space mg/5\space mL\), so concentration per mL is \(\frac{125\space mg}{5\space mL}=25\space mg/mL\).

Step2: Calculate volume to give

Volume \(=\frac{\text{Required drug amount}}{\text{Concentration per mL}}=\frac{25\space mg}{25\space mg/mL}\)
\( = 1\)

Step1: Use concentration formula

Concentration \(C=\frac{\text{Drug amount }(m)}{\text{Volume }(V)}\), so \(V=\frac{m}{C}\).

Step2: Calculate volume

Given \(m = 500\space mg\) and \(C = 250\space mg/mL\), then \(V=\frac{500\space mg}{250\space mg/mL}\)
\( = 2\)

Answer:

6

Question 19