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For example: Lets say you have to give 80mg of IV lasix STAT x1 so that your patient, who is gasping for air and starting to panic more and more by the second, can get some relief from her flash pulmonary edema that just came on. This is not the time to realize you cannot do calculations! Luckily for you, you came here, memorized this formula, and helped save your patient. Bravo! Let's get started. If you already learned how to calculate liquid PO medications you are already done. Yep, that's right, the formula is exactly the same. Example 1Life Saving time! Using the scenario from above, your patient is in respiratory distress. The doctor looks at you and yells (yeah get used to that) "give 80mg IV lasix stat!" The code cart has 10ml vials of lasix. Each vial says 10mg/1ml of lasix. What do you give, and remember do it quickly!Example 2You are starting a heparin gtt. You have calculated that you need to give a 4200 unit bolus of heparin from your protocol orders. You have a 10ml vial of heparin that states the concentration as 1000units/1ml. How much is your bolus in ml?Last ExampleWarning! This one of those multistep IV dosage calculations. you will need a conversion table for metric units of measure.The order states to give 2 grams of magnesium sulfate. You have a bag of fluid that states 1000mg magnesium sulfate per 100ml of normal saline. How many ml do you give AND how many bags will you be giving? As you can see sometimes your dosage calculations will require a little more work. Always go back to the 3 basic steps if you get confused!
Click here when you are ready to learn about IV drip rate calculations Click here to go to the main Nursing Math page 
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