Motrin Elixir 160mg/5ml - Calculate the Correct Volume and Liquid Dosage

Chemical Structure of Motrin / Ibuprofen

Chemical Structure of Motrin / Ibuprofen

Motrin elixir 160mg/5ml

Sig:320mg PRN
Dispense 4oz
How many ml will the patient take in one day

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Answer to Motrin Elixir Question
by: Anonymous

First of all, the Sig is wrong. A doctor would never write for 320mg PRN (as needed). The doctor needs to specify a frequency, such as daily, twice daily, three times daily, every 12 hours, every 8 hours, ect. The pharmacist you work under would not accept this prescription without the frequency specified. 320mg is a low dose. The amount given on this question is 4 ounces. 4 x 30ml/ounce is a total of 120ml. The solution contains 5ml/160mg, so therefore the 320mg dose would be 10ml.

120ml = 12 doses of 10ml (320mg)

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