Select the volume of a drug that should be administered to a patient in order for the patient to receive 90 mg of meperidine (Demerol).The meperidine is to be administered intramuscularly (IM).Demerol is supplied as a 5 percent solution (W/V).

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Step 1: Determine how many milligrams of drug are present in a 5 percent solution. 5 g/100 ml = 5000 mg/100 ml = 50 mg/ml. Step 2: Determine the dosage. 50 mg/ml = 90 mg/X; 50X = 90 ml; X = 90 ml/50; X = 1.8 ml.

Select the Volume of a Drug That Should Be Administered