Warfarin Tablet Strength Identification

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ALiEM – Academic Life in Emergency Medicine

December 30th, 2016

Medical providers commonly encounter patients in the emergency department who state they are anticoagulated with warfarin, but they have no idea what dose they are taking. “I know that I take two pills of warfarin daily.” Dosing becomes critically important especially when continuing their medication as an inpatient, refilling their medications, or adjusting their outpatient dose because of an inappropriately high or low INR level. How can you determine the patient’s warfarin dose?

Trick of the Trade

Ask about the color of his/her warfarin tablets

In the United States, manufacturers of both brand and generic warfarin have agreed to make each strength a consistent color. While the colors do NOT change, the shape and shade may vary.

Helpful Mnemonics

To aid your memory recall of the colors, you can use this mnemonic

Please Let Granny Brown Bring Peaches To Your Wedding”

Alternatively, @scepticalemdoc from Queensland, Australia offered an EM-related mnemonic:

Probably Leaves Granny Bleeding Bloody Profusely, Thank You Warfarin”

MnemonicWarfarin Tablet ColorTablet Strength
ProbablyPink1 mg
LeavesLavender2 mg
GrannyGreen2.5 mg
BleedingBrown3 mg
BloodyBlue4 mg
ProfuselyPeaches5 mg
ThankTeal6 mg
YouYellow7.5 mg
WarfarinWhite10 mg

Safety Considerations

While this color-coding scheme holds true for warfarin dispensed in the United States, it may not apply in other countries. Also be cautious of patients with deuteranopia (color-blindness), who may mistakenly report the wrong tablet color.

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