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  • Read each problem carefully. Write out the dimensional analysis on a sheet of paper.
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  • Try to work the problems without using a calculator.


The doctor has ordered Mellaril liquid 0.1 gm for your patient. You have available Mellaril liquid labeled 30 mg/mL. You will administer _____ mL to your patient.

Step 1: Set up the conversion ratios:

0.1 gm x 1 mL x 1000 mg
1 30 mg 1 gm

Step 2: Cancel like units:

0.1 gm x 1 mL x 1000 mg
1 30 mg 1 gm

Step 3: Complete the math:



1 mL


1000 = 3.3 mL
1 30 1

These drills are intended to be supplementary resource for nurses, medical assistants, and other allied health professionals.  It is not intended to be a primary source of information for unlicensed or informal caregivers. In such instances, detailed information on dosages must be obtained from a physician or pharmacist.

Note: These examples are computer generated in order to provide the widest variety of dosage calculations. If you find any erroneous or misleading solutions, please contact us immediately with a clear description of the exercise.

David L. Heiserman, Editor

Copyright   SweetHaven Publishing Services
All Rights Reserved

Revised: June 06, 2015