Calculating Cefazolin Concentration for IM Use: A Step-by-Step Guide

QUESTION

. A health care provider prescribes Cefazolin 800mg IM every 6 hours. The available vial is labeled cefazolin  1g for IM use add 2.5ml sterile water for injection to provide a total volume of 3.0ml. How many mg/ml ?

ANSWER

Calculating Cefazolin Concentration for IM Use: A Step-by-Step Guide

Introduction

Cefazolin is an antibiotic commonly prescribed for various bacterial infections. The prescribed dosage for a patient may sometimes require reconstitution of the medication from a powdered form to a liquid form for administration. In this scenario, we will explore how to calculate the concentration of cefazolin after reconstitution for IM (intramuscular) use.

Step-by-Step Guide

Step 1: Obtain the necessary information
We have a vial of cefazolin labeled as 1g (1 gram) to be reconstituted with 2.5ml of sterile water for injection. The total volume after reconstitution will be 3.0ml.

Step 2: Calculate the total amount of cefazolin after reconstitution
The vial contains 1g of cefazolin, which is equal to 1000mg (1g = 1000mg). After reconstitution, the total volume will be 3.0ml.

Step 3: Calculate the concentration of cefazolin after reconstitution
To determine the concentration of cefazolin in mg/ml, divide the total amount (in mg) by the total volume (in ml).

Concentration (mg/ml) = Total amount of cefazolin (mg) / Total volume (ml)
Concentration (mg/ml) = 1000mg / 3.0ml ≈ 333.33mg/ml

Conclusion

After reconstitution, the concentration of cefazolin in the vial will be approximately 333.33mg/ml. This information is crucial for accurate medication administration, as it ensures that the prescribed dosage of 800mg IM every 6 hours can be accurately administered to the patient. Healthcare providers must always perform accurate calculations and follow proper reconstitution protocols to ensure patient safety and the effectiveness of the prescribed medication.

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