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A physician order for a 120 mg dose of Gentamycin 40mg/mL should be filled with ______ of Gentamycin.

A 3 mL

The correct answer is 3 mL because for every 1 mL of Gentamycin medication there are 40 mg. 40 mg x 3 equals 120 mg, which is the same as desired dose of 120 mg.