This document provides examples for solving multiple-step dosage calculation problems. It explains that it may be necessary to first convert units before setting up a proportion to solve the problem. A 4-step process is outlined: 1) set up a proportion, 2) convert to like units, 3) substitute the converted unit into the proportion, 4) cross multiply and solve. Several examples are then provided applying this process to calculate the amount in different available units based on the amount ordered.

1. Multiple­Step Calculation January 11, 2013
Objective: multiple­step calculations
Jan 5­3:00 PM
Precription Dosage Wkst 1

2. Multiple­Step Calculation January 11, 2013
Jan 6­11:41 AM
Precription Dosage Wkst 2

3. Multiple­Step Calculation January 11, 2013
It may be necessary to convert from one unit to another first before
solving a dosage problem.
Steps:
1. Set up proportion
2. Convert to like units
3. Substitute converted unit into proportion
4. Cross multiply and solve.
Example: 240 mg are ordered. Medication is available in 2 grains/ 1 tablet.
How many tablets should be given?
Jan 5­3:01 PM
Precription Dosage Wkst 3

4. Multiple­Step Calculation January 11, 2013
Example 2:
Ordered: 0.016 gm
Available: 4 mg/1 ml
How many ml should be given?
Jan 5­3:03 PM
Precription Dosage Wkst 4

5. Multiple­Step Calculation January 11, 2013
Example 3:
Ordered: gr xss orally
Available: 0.3 gm/5cc
How many cc's should be given?
Jan 5­3:04 PM
Precription Dosage Wkst 5

6. Multiple­Step Calculation January 11, 2013
Example 4:
Ordered: Two tablespoons of a liquid every 2 hours for 12 hours.
How many cc's of the drug will the client receive over the 12 hour period?
Jan 5­3:16 PM
Precription Dosage Wkst 6

7. Multiple­Step Calculation January 11, 2013
Example 5:
A client is to receive 2 gm of a drug. The drug comes 500mg/5cc.
Each vial contains 10 cc's. How many vials would you need?
Jan 5­3:18 PM
Precription Dosage Wkst 7

8. Multiple­Step Calculation January 11, 2013
Bellwork
Ordered: 0.056 gm
Available: 8 mg/3 ml
How many ml should be given?
Jan 10­7:41 AM
Precription Dosage Wkst 8