A nurse is preparing to administer valproic acid 400 tog PO bid for migraine headaches. Available is valproic acid 250 mg/5mL. How many ml should the nurse administer per dose, (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["8"]
Step 1: Determine the ratio of milligrams per millilitre from the available valproic acid.
The available valproic acid is labelled "250 mg/5 mL." This means that for every 5 mL of the solution, there are 250 milligrams of valproic acid.
Step 2: Calculate the number of millilitres needed for 400 milligrams.
We can set up a proportion to solve for the unknown number of millilitres:
(250 mg) / (5 mL) = (400 mg) / (x mL)
Cross-multiplying:
250 mg * x mL = 5 mL * 400 mg
Step 3: Solve for x (the number of millilitres).
Divide both sides of the equation by 250 mg:
x mL = (5 mL * 400 mg) / (250 mg)
x mL = 8 mL
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Related Questions
Correct Answer is ["2"]
Explanation
Step 1: Set up the calculation.
You need to determine how many mL of the available solution will provide the ordered 20 mEq.
Use the formula:
Volume to administer=Desired dose / Concentration
Where:
• Desired dose = 20 mEq
• Concentration = 10 mEq/mL
Step 2: Plug in the values and calculate.
Volume to administer=20 mEq / 10 mEq/mL
Volume to administer=2 mL
Correct Answer is ["0.5"]
Explanation
Step 1: Set up the calculation.
You need to determine how many mL of the available solution will provide the ordered 1 mg.
Use the formula:
Volume to administer=Desired dose / Concentration
Where:
• Desired dose = 1 mg
• Concentration = 1 mg/0.5 mL
Step 2: Plug in the values and calculate.
Volume to administer=1 mg / 1 mg/0.5 mL
Volume to administer=0.5 mL
Step 3: Round the answer.
In this case, the calculation gives an exact value, so no rounding is necessary.
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