Med Calculation

Question

Ordered: Ampicillin 250 mg IM BID Available: Ampicillin 1 gm powder to be mixed according to the following directions: 1.8 mL diluent = 500 mg/mL. How many mL of reconstituted solution would you need to administer 250 mg of Ampicillin?

Answer 1

You would give 1/2 ml which 250mg is 1/2 of 500 mg that would equal 1ml. But you only need 250 mg so you just give 1/2 ml.

Answer 2

1 ml of reconstituted solution has 500 mg in it.

In order to administer 250 mg of this medication, you would administer 1/2 mL as 250 is 1/2 of 500.

To solve this question using dimensional analysis, you solve by X and plug in the numbers provided in the example:

?x ml: 1 ml x 250 mg = 1 ml

500 mg dose ordered 2