An adult client with myasthenia gravis is receiving pyridostigmine (Mestinon) 126 mg PO every 4 hours. The drug is available as 60 mg in 5 ml syrup. How many ml should the nurse administer? (If rounding is required, round to the nearest tenth.)
The Correct Answer is ["10.5"]
To calculate the volume of pyridostigmine to be administered, we can use the following formula:
Volume (mL) = Desired Dose (mg) / Concentration (mg/mL)
However, the concentration is given in mg/5 mL. We need to convert it to mg/mL:
Concentration (mg/mL) = 60 mg / 5 mL = 12 mg/mL
Now, plug in the given values into the formula:
Volume (mL) = 126 mg / 12 mg/mL
Volume (mL) = 10.5 mL
Therefore, the nurse should administer 10.5 mL of pyridostigmine syrup.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["160"]
Explanation
To prepare a 4-hour solution of Osmolite® 1/2 strength enteral formula at 80 ml/hour, the nurse will need to dilute the full-strength formula with a certain amount of water.
Step 1: Calculate the total volume of the 1/2 strength formula needed for 4 hours:
Total Volume = Infusion Rate (mL/hour) x Infusion Time (hours)
Total Volume = 80 mL/hour x 4 hours
Total Volume = 320 mL
Step 2: Determine the volume of full-strength Osmolite® needed:
Since the desired solution is 1/2 strength, we need to dilute the full-strength formula by half.
Volume of Full-Strength Osmolite® = Total Volume / 2
Volume of Full-Strength Osmolite® = 320 mL / 2
Volume of Full-Strength Osmolite® = 160 mL
Step 3: Calculate the volume of water needed to dilute the full-strength Osmolite®:
Volume of Water = Total Volume - Volume of Full-Strength Osmolite®
Volume of Water = 320 mL - 160 mL
Volume of Water = 160 mL
Therefore, the nurse should dilute the full-strength Osmolite® with 160 mL of water to prepare a 4-hour solution.
Correct Answer is ["3"]
Explanation
Calculating the Trimethoprim-Sulfamethoxazole Dose
Problem: Administer 120 mg of Bactrim-DS Oral Suspension. The available concentration is 200 mg/5 mL.
Steps:
Set up a proportion:
We want to find the number of milliliters (mL) needed.
We know the desired dose (120 mg) and the concentration of the medication (200 mg/5 mL).
Proportion:
x mL / 120 mg = 5 mL / 200 mg
Cross-multiply:
200x = 600
Solve for x:
x = 600 / 200
x = 3
Answer: The nurse should administer 3 mL of Bactrim-DS Oral Suspension per dose.
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