Published on: August 19, 2024
Include the correct unit of measurement in all answers, 1. Order:
Erythromicin 0.5 g via g-tube gid. Available: Erythromicin oral solution 125 mg per 5 mL How many ml will you give? 2.
Order: Erythromycin 0.5 g via g-tube, three times a day (tid).
Available: Erythromycin oral solution 125 mg per 5 mL.
Steps:
1. Convert 0.5 g to mg:
0.5 g=500 mg0.5 \text{ g} = 500 \text{ mg}0.5 g=500 mg
2. Determine how many mL are needed for 500 mg:
Available concentration=125 mg/5 mL\text{Available concentration} = 125 \text{ mg/5 mL}Available concentration=125 mg/5 mL Volume=Desired DoseAvailable Concentration×Volume of Solution\text{Volume} = \frac{\text{Desired Dose}}{\text{Available Concentration}} \times \text{Volume of Solution}Volume=Available ConcentrationDesired Dose×Volume of Solution Volume=500 mg125 mg×5 mL\text{Volume} = \frac{500 \text{ mg}}{125 \text{ mg}} \times 5 \text{ mL}Volume=125 mg500 mg×5 mL Volume=4×5 mL\text{Volume} = 4 \times 5 \text{ mL}Volume=4×5 mL Volume=20 mL\text{Volume} = 20 \text{ mL}Volume=20 mL
Answer: You will give 20 mL.
Order: 300 mL of 1/3 strength Ensure.
Available: (Assumed) Standard Ensure formula, with 1 strength Ensure being the full concentration.
Steps:
1. If 1 strength Ensure requires a certain volume to make 1/3 strength, you need to dilute the formula.
2. For 1/3 strength, you would mix 1 part of the Ensure formula with 2 parts of water.
Total Volume=Volume of Ensure+Volume of Water\text{Total Volume} = \text{Volume of Ensure} + \text{Volume of Water}Total Volume=Volume of Ensure+Volume of Water
To get 300 mL of 1/3 strength Ensure:
Volume of Ensure=300 mL3=100 mL\text{Volume of Ensure} = \frac{300 \text{ mL}}{3} = 100 \text{ mL}Volume of Ensure=3300 mL=100 mL Volume of Water=300 mL−100 mL=200 mL\text{Volume of Water} = 300 \text{ mL} - 100 \text{ mL} = 200 \text{ mL}Volume of Water=300 mL−100 mL=200 mL
Answer: You will use 100 mL of Ensure and 200 mL of water to make 300 mL of 1/3 strength Ensure.
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