Days Supply Question with Coumadin (warfarin) half-tabs and whole tabs

by Walter
(Mississippi)

Blood Cells Flowing Through A Vein

Blood Cells Flowing Through A Vein

Coumadin: Take one-half tablet on sun, mon, thur, fri, and sat., then take 1 tab tues and wed. Quantity is 90 tabs/ so what would be your days' supply?

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Oct 08, 2019
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starstarstarstarstar 		Coumadin dose
by: Anonymous

My nieces dr changed her coumadin she now takes 1 tablet sun mon tues thurs fri sat and 1&half wed why is this we don't understand?
May 31, 2017
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starstarstarstarstar 		#90 warfarin pills will last the patient 140 days at this dose
by: David

Thank you for the question, Walter!

So we have #90 tablets of warfarin. We haven't been given the strength.

The patient is to take 1/2 tablet on Sundays, Mondays, Thursdays, Fridays, and Saturdays; also the patient is to take 1 whole tablet on Tuesdays and Wednesdays.

So this gives us 5 days of taking a half tab... which equals 2 & 1/2 tabs of half-tabs each week.

In addition, we have a total of 2 tablets (one on Tuesdays and one on Wednesdays) weekly.

So, for each week that the patient stays on this dose/cycle, he or she will be taking 4 1/2 tablets weekly.

We have #90 pills. Divide 4.5 into 90 and you come up with 20. Then we multiply 20 by 7 (one week) and we get 140 (Days).

While patients are prescribed warfarin, they must get regular monitoring of their blood levels by a test called a Prothrombin Time, or PT test.

A PT test helps to figure out the cause of the patients bleeding or the cause of abnormal blood clots.

From the results of the PT test, a calculation can be made, called an INR, or International Normalized Ratio.

According to a website all about medical lab tests, https://labtestsonline.org/understanding/analytes/pt/tab/test/
"The goal of warfarin therapy is to maintain a balance between preventing clots and causing excessive bleeding. This balance requires careful monitoring. The INR can be used to adjust a person's drug dosage to get the PT into the desired range that is right for the person and his or her condition."

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