A homebound patient must take 400,000 units of nystatin PO every 4 hours, to swish in the mouth and then swallow. It is available as 100,000 units/5 mL. The patient has only household measuring spoons. How should the patient be instructed to take the dose?
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Solution
\(400,000\, units\times \frac{5\, mL}{100,000\, units}\times \frac{1\, tsp}{5\, mL}= 4\, teaspoons\)
A patient is placed on methadone maintenance therapy of 15 mg/day PO. It is supplied as 10 mg in 5 mL oral solution. How many milliliters should you instruct the patient to take?
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Solution
\(15\, mg\times \frac{5\, mL}{10\, mg}= 7.5\, mL\)
You have an order to administer 40 mg of methadone SC for opioid detoxification. You have on hand 30 mg/mL. How much should you draw into the syringe?
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Solution
\(40\, mg\times \frac{1\, mL}{30\, mg}= 1.3\, mL\)
You have on hand hydromorphone (Dilaudid) 4 mg/mL. You need to administer 0.015 mg/kg to a patient who weighs 150 pounds. How many milliliters should you administer?
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Solution
\(\frac{0.015\, mg}{1\, kg}\times \frac{1\, kg}{2.2\, lbs}\times 150\, lbs\times \frac{1\, mL}{4\, mg}= 0.26 mL\)
A patient on hemodialysis must maintain careful intake and output. For breakfast he had 1 cup of coffee and 3 oz of milk on his cereal. For lunch he drank 6 oz of lemonade and ate 1 cup of soup. For supper he drank 1 cup of coffee. He took his morning and evening pills with 4 oz of water each time. Has he stayed within his 1000 mL fluid restriction?
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Solution
Answer: B. No
\(1\, cup\times \frac{240\, mL}{1\, cup}= 240\, mL\)
\(3\, oz\times \frac{30\, mL}{1\, oz}= 90\, mL\)
\(6\, oz\times \frac{30\, mL}{1\, oz}= 180\, mL\)
\(4\, oz\times \frac{30\, mL}{1\, oz}= 120\, mL\)
240 mL + 90 mL + 180 mL + 240 mL + 240 mL + 120 mL + 120 mL = 1,230 mL
No, he has exceeded his fluid restriction limit by 230 mL
A patient with heart failure has a daily order for digoxin 0.25 mg PO. Digoxin 0.125 mg tablets are available. How many tablets should you give?
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Solution
\(0.25\, mg\times \frac{1\, tablet}{0.125\, mg}= 2\, tablets\)
The physician writes a “now” order for codeine 45 mg IM for a patient with a vertebral compression fracture. You have on hand codeine 60 mg/2 mL. How many milliliters should you give?
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Solution
\(45\, mg\times \frac{2\, mL}{60\, mg}= 1.5\, mL\)
A patient is instructed to take acetaminophen (Tylenol) liquid (elixir) 650 mg qid. The elixir is 160 mg/5 mL. How many milliliters per dose should the patient take?
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Solution
\(650\, mg\times \frac{5\, mL}{160\, mg}= 20\, mL\)
You have available lorazepam (Ativan) 0.5 mg tablets, and you need to administer 1 mg PO. How many tablets will you administer?
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Solution
\(1\, mg\times \frac{1\, tablet}{0.5\, mg}= 2\, tablets\)
A patient is receiving 160 mg of methylprednisolone IM every 12 hours. You have on hand two vials that each contains 125 mg/2 mL. How much will you draw into a syringe?
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Solution
\(160\, mg\times \frac{2\, mL}{125\, mg}= 2.6\, mL\)