PO dosage calculator

 

PO dosage calculator - liquids

dose ordered
dose available
volume available
volume to give

Formula

 dose ordered 
dose available

 x volume available

 

Examples

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

 100mg 
27mg

 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

 650mg 
120mg

 x 5mL

which = 27.08 mL

So the volume to give = 27 mL 

Note

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).

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