A patient is receiving 250,000 units of penicillin G IM every 6 hours. You have on hand 300,000 units/mL. How much will you draw into the syringe?
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Solution
\(250,000\, units\times \frac{1\, mL}{300,000\, units}= 0.8\, mL\)
The physician orders codeine gr 1/4IM every 4 hours prn for a patient with pain. You have on hand codeine gr 1/2 per mL. What is the correct dose?
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Solution
\(1/4\, gr\times \frac{1\, mL}{1/2\, gr}= 0.5\, mL\)
*1 gr = 60 mg
You evaluate a patient’s intake and output for 8 hours. Intake for 8 hours:
3 8-oz cups of coffee
4 oz orange juice
3/4 cup of milk
8 oz tomato soup
1/2 cup Jello
2 cups of water
750 mL of 0.9% normal saline IV
How many milliliters should you record as intake?
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Solution
*First, you must convert all amounts to the same units, usually milliliters.
\(3\, cups\times \frac{8\, oz}{1\, cup}\times \frac{30\, mL}{1\, oz}= 720\, mL\, coffee\)
\(4\, oz\times \frac{30\, mL}{1\, oz}= 120\, mL\, orange\, juice\)
\(3/4\, cup\times \frac{240\, mL}{1\, cup}= 180\, mL\, milk\)
\(8\, oz\times \frac{30\, mL}{1\, oz}= 240\, mL\, soup\)
\(1/2\, cup\times \frac{240\, mL}{1\, cup}= 120\, mL\, Jello\)
\(2\, cups\times \frac{240\, mL}{1\, cup}= 480\, mL\, water\)
Now add: 720 + 120 + 180 + 240 + 120 + 480 + 750 = 2,610 mL intake
Your patient has an order for heparin SC 2500 units bid. You have on hand heparin 5000 units/mL. How many milliliters will you administer in a day?
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Solution
\(2,500\, units\times \frac{1\, mL}{5,000\, units}\times 2\, doses= 1\, mL\)
You have an order to administer heparin sodium IV at 1000 units per hour. It is supplied by your pharmacy as 25,000 units in 250 mL of D5W. For how many milliliters per hour should you program the controller?
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Solution
\(\frac{1,000\, units}{hour}\times \frac{250\, mL}{25,000\, units}= 10\, mL/hour\)
Your order reads gatifloxacin (Tequin) 400 mg IV daily. It arrives in 50 mL of D5W, to run over 30 minutes. How many drops per minute will you set if you have tubing with a drop factor of 10?
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Solution
\(\frac{50\, mL}{30\, mins}\times \frac{10\, gtts}{mL}= 17\, gtts/minute\)
You have an order to administer 1 L of D5W IV over 8 hours. How many drops per minute will you set if you are using tubing with a drop factor of 15?
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Solution
\(\frac{1\, L}{16\, hrs}\times \frac{1,000\, mL}{1\, L}= 63\, mL/hour\)
You are caring for a patient at home who must take magnesium hydroxide/aluminum hydroxide (Maalox) 30 mL PO. How will you instruct the patient to measure the dose using ordinary household measuring devices?
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Solution
\(30\, mL\times \frac{1\, tbsp}{15\, mL}= 2\, tbsp\)
The recommended IV dose of gentamicin is 1 to 5 mg/kg. What is a safe range to administer to an adult man weighing 190 pounds?
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Solution
\(\frac{1\, mg}{1\, kg}\times 190\, lbs\times \frac{1\, kg}{2.2\, lbs}= 86\, mg\)
\(\frac{5\, mg}{1\, kg}\times 190\, lbs\times \frac{1\, kg}{2.2\, lbs}= 431\, mg\)
*The safe range is between 86 and 431 mg.