| http://www.w3.org/ns/prov#value | - It may take up to one month for a physician to reach anoptimal therapeutic level of warfarin for an individual patient.Medications (such as antibiotics, birth control pills, estrogens, and other hormones) can also affect theaction of warfarin in the liver, necessitating the evaluation of the possible effect of the added medicationon the PT/INR. Any time a physician changes or adds medication to a
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