Warfarin Dosage-Odds or Evens?

Patients who have been prescribed an alternating dosage of warfarin-for example, 2 mg one day and 3 mg the next-may have trouble determining how much to take because they cannot remember how much they took the day before. Tell them to take the even dose on even-numbered days of the month (eg, 2 mg on the 2nd, 4th, 6th, and so on) and to take the odd dose on odd-numbered days (eg, 3 mg on the 3rd, 5th, 7th, and so on).

-- Shefali Gupta, MD
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