manuel's web PO dosage calculator - liquids
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dose ordered
dose available
volume available
volume to give


 dose ordered 
dose available

x volume available



Give 100 mg of theophylline elixir.  The elixir comes as 27 mg per 5 mL.  Using the calculator, a dosage of 18.5 mL is prepared.  In this example,

100 mg = dose ordered
27 mg = dose available
5 mL = volume available


x 5mL

Which = 18.52 mL

So the volume to give = 18.5 mL

See the example below.

Doesn't work, just an example


Another example, give 650 mg of liquid acetaminophen (Tylenol).  The liquid acetaminophen comes in a concentration of 120 mg per 5 mL.  How much medication would you give?  Answer: 27 mL.

650 mg = dose ordered
120 mg = dose available
5 mL = volume available


x 5mL

which = 27.08 mL

So the volume to give = 27 mL 


It doesn't matter what type of units are used in this calculator.  You can figure out how many grams to give or how many milligrams to give, micrograms, units, grains, etc.  Remember to be consistent (i.e. don't mix milligrams with grams).

2006 m. villanueva

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