This is what came up on the Pill Identifier on searching for a pill marked '3', green color, 4 sided:
INV 311 2.5
Pill imprint INV 311 2.5 has been identified as Warfarin sodium 2.5 mg.
Warfarin is used in the treatment of heart failure; heart attack; prevention of thromboembolism in atrial fibrillation; deep vein thrombosis, first event; pulmonary embolism, first event (and more), and belongs to the drug class coumarins and indandiones. Not for use in pregnancy.
Warfarin 2.5 mg is not subject to the Controlled Substances Act.
However, please check it with a pharmacist/pharmacy, take care.
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