Question

In: Nursing

The patient has an order for cephalexin (Keflex) 350 mg orally. The medication available is cephalexin...

The patient has an order for cephalexin (Keflex) 350 mg orally. The medication available is cephalexin 250 mg/2 mL. How many mL will the nurse administered

Expert Solution

Before we continue with calculation, we will try to estimate our answer. This is really possible only with such simple questions.

We have ; 250 mg in 2ml.

So,we can understand 125 mg in 1 ml (250/2).

Therefore, 375 mg in 3 ml (2ml+1ml).

So,it is clear that 350 mg will be present in within range of 2-3 ml.

Step 1

Write down what we have,

250 mg in 2 ml.

Step 2

Calculate how much one unit of what we have, that is,

250 mg in 2 ml

1mg of keflex = 2÷250 ml

(using one unit rule)

Step 3

We have to find how much ml of keflex is needed to give dosage of 350 mg.Therefore multiply the amount got from step 2 by 350.

350 mg = (2÷250)×350

= 2.8 ml

Answer : we will have to give 2.8 ml of keflex to the client.

This answer correlates with our initial estimation. 2.8 ml is within the range of 2 - 3 ml.

From the above, a formula can be derived;

(amount want ÷ amount have) × volume it's in

Remember care must be taken when using formula. Ensure that numbers are entered and calculated correctly.

Substituting the values in this formula,

Amount want = 350mg

Amount have = 250 mg

Volume it's in = 2 ml

So,

(350÷250)×2 = 2.8

You can apply this method to whatever type of such calculations.

Tip: several ways are there for solving these types of calculations. It is best to learn one way and stick on it.

Convey feedbacks to improve my answers.

Have a nice day.

Nightingale answered 1 year ago

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