Cefazolin Dilution Pharmacy Math Question

by Thomas
(VA)

Cefazolin Dilution From a Stock of 1G/5mL

Cefazolin Dilution From a Stock of 1G/5mL

Prepare 15 mL of a 50 mg/mL cefazolin dilution from a stock of 1 g/5 mL. How many milliliters of diluent and stock solution will be needed?

I am having such a hard time getting these types of calculations? I just dont get this at all?? Can you show how you worked it out?

Comments for Cefazolin Dilution Pharmacy Math Question

Average Rating starstarstarstarstar

Click here to add your own comments

Rating
starstarstarstarstar
Answer
by: Anonymous

You can find your answer this way..
1g=1000mg you want all units to be the same before you start equations.

Once you convert..
15mL x 50mg/1mL x 5mL/1000mg= 3.75mL of your stock needed.
To find dilution simply subtract the 15mL you started with from the quantity needed..
15mL-3.75mL=11.25mL

Rating
starstarstarstarstar
Use the Equation: Density = Mass/Volume
by: Anonymous

Pharmacy work involves being able to create solutions or dilutions with a variety of different medications.

In some cases, these are not as easy as simply pulling our jars and bottles and measuring an amount.

In some cases, the stock solution may be much stronger than the necessary dilution calls for; this means that as a pharmacy technician dealing with medication you need to be able to make the necessary dilution.


Start by looking at everything you are going to need.

You need a 15 mL Cefazolin solution. The stock medication Cefazolin is presented in a 1g/5mL stock strength.

The solution however, requires a 50mg/mL Cefazolin solution dilution.

In order to complete the dilution you need to figure out how much Cefazolin you need to add to how much of the dilution solution in order to create the necessary 15mL solution.

There are several different ways to answer this problem; the easiest way will be to run the calculations in terms of density, mass, and volume.

The basic formula you will need is:

Density = Mass/Volume



Step 1: Set up the first equation. Take the following pieces of data: the final solution amount or volume 15mL and the density of the stock solution within the final solution, which is 50mg/mL.



Density = 50mg/mL

50mg/mL = Mass/15mL

Volume = 15mL



Step 2: You want to remove the mL from each side of the equation. You do this by multiplying by 15mL on each side.



This leaves you with Mass = 50mg * 15, which gives you 750mg. This means that the final amount of the stock solution in the final solution is 750mg. This will give you the 50mg/mL dilution.



You still need to determine how much of the stock solution is necessary to obtain this amount. This brings you to the second equation. You will still be working with density.



Step 3: Density = Mass/Volume. In this equation, you have the density 1g/5ml = 0.75g/volume.



Step 4: Multiple each side so that the equation becomes Volume = Mass/Density. The 1g/5ml will convert into a decimal of 0.2.



Step 5: This gives you the following equation:

Volume = 0.75/0.2.

This gives you a volume of 3.75mL of the stock solution is necessary along with 11.25mL of the solution being used for the dilution to create the ratio of 50mg/mL of the stock drug in the final 15mL solution.

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Pharmacy Tech Math Questions.

Back to Home

[?]Subscribe To This Site
  • XML RSS
  • follow us in feedly
  • Add to My Yahoo!


Didn't find what you were looking for? Use the box below to search this entire site.

Custom Search



Recent Articles

  1. Medicare Part D

    Jul 31, 18 10:26 PM

    This page answers questions about Medicare Part D, the prescription drug benefit offered by Medicare. Topics include: Who is eligible? What are some of the Costs? Factors to Consider when choosing a p…

    Read More

  2. What are some strategies the FDA has implemented, which help prevent medication errors in the pharmacy?

    Jul 29, 18 06:23 PM

    It seems like some of the errors that have been recently made by our pharmacy techs are actually really preventable. Does the FDA do anything about

    Read More

  3. Osmolarity/Hospital Potassium Infusion problem (3 Part Question)

    Jul 29, 18 05:24 PM

    At 3:00 P.M., a pharmacist received an order to add 30 mEq/L of potassium chloride to the already running intravenous fluid for a patient. After checking

    Read More

  4. HOW MANY DAYS EARLY CAN I GET MY XANAX PRESCRIPTION REFILLED ?

    Jul 29, 18 05:12 PM

    My pharmacy tells me I can get it 3 days early but then they wont fill it but 2 days early. Is the law on Xanax 2 or 3 days ?

    Read More

  5. pharmacy technician exam

    Jul 13, 18 10:36 PM

    I am looking for a tutor to help me prepare for the pharmacy technician certification exam. I live in area code 85373. Can anyone recommend a tutor?

    Read More

  6. Bromfenac(bromday) 0.09% When can I get a refill?

    Jul 13, 18 10:25 PM

    I am to instill 3 drops into both eyes 3 times a day. Received prescription, of 3 bottles/vials, on 16 Mar 18 and need to know how to figure how long

    Read More

  7. Is Publicly mentioning the name of the drug the patient is on a HIPPA violation?

    Jul 13, 18 10:17 PM

    If the name of the drug is mentioned in order to further assist the patient with getting them the medication, is this a violation of hipaa?

    Read More

  8. What is a "Root Cause Analysis"? And how does a pharmacy create "healthy safety culture"?

    Jul 13, 18 09:56 PM

    Recently there was a wrong-drug mistake at the pharmacy I'm employed at as a technician. One of my tech friends (who works at a different pharmacy) asked

    Read More

  9. What is the Correct Dosage for Protamine Sulfate After Receiving 3,000 units of Heparin?

    Jun 28, 18 11:01 PM

    The intern sent the following orders down: Mr. Brown, 50 mg protamine sulfate STAT. You check Mr. Brown’s chart, and he received 3,000 units of heparin.

    Read More

  10. Prior Authorization Rejection

    Apr 10, 18 11:13 PM

    This page covers what a Prior Authorization is and why it happens.

    Read More

  11. My 10 yr olds prescription -- Is The Following Situation a HIPPA Violation?

    Apr 10, 18 10:00 PM

    I know someone who is a pharmacy tech. My 10yr.olds medication was called into the pharmacy she works at. Her daughter and my daughters have an on-off

    Read More

  12. My Pharmacy told my mom that I didn't pick up my meds. Is this a Hippa Violation?

    Apr 10, 18 09:26 PM

    My pharmacy told my mom I didn't pick up my meds. Yes, I do have same last name but I have a different address; for all they know, that wasn't my mom.

    Read More

  13. Vitamin Resources

    Apr 08, 18 02:43 PM

    Vitamin Resources - Information about Vitamin A, The B Vitamins, Vitamin C, and Vitamin D.

    Read More

  14. Two HIPPA Questions: Including, Can Pharmacy Techs counsel patients?

    Mar 27, 18 10:20 PM

    under the hippa law can a pharmacist and a pharmacy tech speak about a clients medical record amongs each other and cam pharmacy techs counsel the patient

    Read More

  15. Should pharmacy errors be reported anywhere?

    Mar 27, 18 10:11 PM

    Our pharmacy manager wants us to report any pharmacy error that happens. Why is it important to report errors? Where should we report the errors to?

    Read More