Tablets and oral liquid doses
Find how many tablets or how many mL of liquid to give. Use the order and the label on the drug.
For practice only. Not for clinical use. The drug names and numbers are made up. Always follow your school's and your facility's rules.
Practice problem
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The order is Quorvane 200 mg by mouth. Each tablet contains 100 mg. How many tablets do you give?
Round to the nearest half tablet.
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How to solve it
Make the units the same. Divide the dose ordered by the dose on hand. Multiply the result by the amount on hand: one tablet, or the mL of liquid that holds the dose on hand.
Worked example
The order is Calvorin 1,250 mg by mouth. Each tablet contains 500 mg. How many tablets do you give?
Solution
- Desired = 1,250 mg. Have = 500 mg in 1 tablet.
- (1,250 mg ÷ 500 mg) × 1 tablet = 2.5 tablets.
Formula: Dose = (desired ÷ have) × quantity
Answer: 2.5 tablets
Questions
How do I find the number of tablets?
Divide the dose ordered by the dose in one tablet. For example, 500 mg ordered and 250 mg in each tablet gives 2 tablets.
What if the units are not the same?
Change one of them first. For example, change 0.5 g to 500 mg. Then do the division.
How do I find the mL of an oral liquid?
Divide the dose ordered by the dose on hand. Multiply by the mL that hold the dose on hand. For example, 100 mg ordered from 50 mg in 5 mL gives 10 mL.
What does the rounding message mean?
Your number is right, but you did not round it as the problem asks. Round it the way the problem says. Then type it again.