The health care provider prescribes Solu-Medrol 100 mg. The medication is supplied as 125 mg in 2 mL
The nurse calculates the dosage using the ratio and proportion method. How many mL of medication would the nurse administer to equal 100 mg?
____ mL
Record the answer rounding to the nearest tenth.
Correct Answer: 1.6
Using the ratio and proportion method, the amount on hand is placed on one side of the equation whereas the dosage desired is placed on the other side of the equation. The dose on hand is 125 mg in 5 mL. In ratio format, this would be 125:5. The dosage desired is 100 mg, but the amount of medication required for this dosage is unknown, so it would be put in ratio format as 100:x. It is essential when setting up the ratio that weight is on the same side of the ratio on both sides of the equation and the volume is on the same side as well. The equation would be 125:5 = 100:x. The values on the outsides of the equation are multiplied (125 X x) and the values on the inside are multiplied (5 X 100), resulting in the following equation: 125 X x = 5 X 100. 125x = 500. Dividing both sides by 125 to leave the x standing alone on one side results in x = 500 ÷ 125, or x = 1.6 mL.
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