Q133] A 60 year old woman is on clopidogrel therapy and is also taking ginkgo biloba. By altering which of the following does Ginkgo potentiate the effect of clopidogrel? ?
a] Bleeding time
b] Clotting time
c] Reduction of Factor V and VII
d) Displaces clopidogrel from protein binding sites
e) Thrombin time
Archer USMLE Step 3 Blog 
c- prothrombin time
e-prothrombin time
A.
Ginko inhibits platelet aggregation like aspirin so it should prolong BT
Not sure of any other mechanism of action ascribed to ginko causing bleeding.
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a
A – Bleeding time. Gingko Bilboa (B for bleeding time) always remember!
It has only potentiation effect on other medications action of increasing bleeding so answer A=http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2000722/
A: Bleeding time. Ginkgo biloba inhibit platelet inhibiting factor and prevent platelet aggregation. prolong bleeding time.