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Pro Calc Nursing 131
Calculating dosage in tabs, caps, ml
This tutorial demonstrates calculating the number of tablets, capsules, or milliliters to prepare.
Our first example: 35mg of Sinequan(Doxepin) has been prescribed po. How many ml should you administer if the Sinequan is available in a strength labeled 10 mg in 1 ml?
Calculating dosage in tabs, caps, ml
Step One – Write down the dosage you want to administer.
Step Two – Write down the known strength.
Step Three – Reduce the units.
Step Four – Perform the math.
Calculating dosage in tabs, caps, ml
Our first example: 35mg of Sinequan(Doxepin) has been prescribed po. How many ml should you administer if the Sinequan is available in a strength labeled 10 mg in 1 ml?
Step One – Write down the dosage you want to administer.
In our example, we want to administer 35 mg.
35 mg
1
We’ll write this as a fraction with a denominator of 1.
Calculating dosage in tabs, caps, ml
Our first example: 35mg of Sinequan(Doxepin) has been prescribed po. How many ml should you administer if the Sinequan is available in a strength labeled 10 mg in 1 ml?
In our example, the strength is 10mg in 1 ml.
(Step One)
35 mg
1
We can write this strength two ways.
Step Two – Write down the known strength.
1 ml
10 mg
10 mg
1 mlor
Since the fraction we wrote in step one has mg on the top, our next fraction needs to have mg on the bottom.
(Step Two)
1 ml
10 mg
Calculating dosage in tabs, caps, ml
Cross off any matching pairs of unit labels. The label left should be what you want to find.
(Step One)
35 mg
1
Step Three – Reduce the units.
(Step Two)
1 ml
10 mg
In this example the only unit left is ml which is what we want to find.
Calculating dosage in tabs, caps, ml(Step One)
35 mg
1
Step Four – Perform the math.
(Step Two)
1 ml
10 mg
We have found that we to need administer 3.5 ml of Sinequan.
35 x 11 x 10
3510
= 3.5 ml
Reduce any fractions and remember the units label.
Our first example: 35mg of Sinequan(Doxepin) has been prescribed po. How many ml should you administer if the Sinequan is available in a strength labeled 10 mg in 1 ml?
=
Calculating dosage in tabs, caps, ml
Our second example: 500 mg of Keflex (Cephalexin) has been prescribed. 250 mg of Keflex is available in capsules. How many capsules should be administered?
Step One – Write down the dosage you want to administer.
In our example, we want to administer 500 mg.
500 mg
1
We’ll write this as a fraction with a denominator of 1.
Calculating dosage in tabs, caps, ml
Our second example: 500 mg of Keflex (Cephalexin) has been prescribed. 250 mg of Keflex is available in capsules. How many capsules should be administered?
(Step One)
500 mg
1
Step Two – Write down the known strength.In our example, the strength is 250 mg in 1
capsule. We can write this strength two ways.
1 capsule
250 mg
250 mg
1 capsuleor
Since the fraction we wrote in step one has mg on the top, our next fraction needs to have mg on the bottom.
(Step Two)
1 capsule
250 mg
Calculating dosage in tabs, caps, ml
Cross off any matching pairs of unit labels. The label left should be what you want to find.
Step Three – Reduce the units.
In this example the only unit left is capsules which is what we want to find.
(Step One)
500 mg
1
(Step Two)
1 capsule
250 mg
Calculating dosage in tabs, caps, ml
Step Four – Perform the math.
We have found that we need to administer 2 capsules of Keflex.
500 x 11 x 250
500 capsules250
= 2 capsules
Reduce any fractions and remember the units label.
(Step One)
500 mg
1
(Step Two)
1 capsule
250 mg
Our second example: 500 mg of Keflex (Cephalexin) has been prescribed. 250 mg of Keflex is available in capsules. How many capsules should be administered?
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Dosage CalculationTutorial
