You have an order for levothyroxine (Synthroid) 0.05 mg PO. You have on hand Synthroid 100 mg tablets. How should you prepare the correct dose?
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Solution
\(0.05\, mg\times \frac{1,000\, mcg}{1\, mg}\times \frac{1\, tablet}{100\, mcg}= 1/2\, tablet\)
You need to administer 15 mg of morphine IM. You have on hand gr 1/4 per mL. How should you prepare the correct dose?
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Solution
\(15\, mg\times \frac{1\, gr}{60\, mg}\times \frac{1\, mL}{1/4\, gr}= 1\, mL\)
You have an order for heparin 3000 units SC every 12 hours. You have available 5000 units/mL. How many milliliters will you give?
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Solution
\(3,000\, units\times \frac{1\, mL}{5,000\, units}= 0.6\, mL\)
You need to administer 40 mg of furosemide (Lasix) PO. You have on hand Lasix 20 mg tablets. How many tablets should you give?
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Solution
\(40\, mg\times \frac{1\, tablet}{20\, mg}= 2\, tablets\)
You have an order for furosemide (Lasix) 80 mg IV every morning. You have on hand Lasix 20 mg in 2 mL sterile water. How many milliliters should you prepare?
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Solution
\(80\, mg\times \frac{2\, mL}{20\, mg}= 8\, mL\)
A patient is to receive cefuroxime (Zinacef) 1 g in D5W 100 mL IV every 8 hours, to infuse over 60 minutes. How many drops per minute do you set on gravity tubing that delivers 10 gtts/mL?
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Solution
\(\frac{100\, mL}{60\, mins}\times \frac{10\, gtts}{mL}= 17\, mins\)
You have an order to infuse 500 mL normal saline IV over 4 hours. How many drops per minute will you set on gravity tubing that delivers 10 gtts/mL?
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Solution
\(\frac{500\, mL}{4\, hrs}\times \frac{1\, hr}{60\, mins}\times \frac{10\, gtts}{mL}= 21\, gtts/min\)
You need to administer amphotericin B 0.5 mg/kg IV daily to a patient with histoplasmosis who weighs 236 pounds. How many milligrams should you expect to administer each day?
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Solution
\(\frac{0.5\, mg}{kg}\times 236\, lbs\times \frac{1\, kg}{2.2\, lbs}= 53.6\, mg\)
You have an order for morphine 4 mg IV push every 2 hours prn dyspnea. You have morphine gr 1/6 per mL on hand. How many milliliters should you prepare?
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Solution
\(4\, mg\times \frac{1\, gr}{60\, mg}\times \frac{1\, mL}{1/6\, mg}= 0.4\, mL\)
Phenobarbital is supplied as 60 mg/mL. You need to administer 160 mg IV stat. How many milliliters should you administer?
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Solution
\(160\, mg\times \frac{1\, mL}{60\, mg}= 2.7\, mL\)