There has been a report of an
interaction between ginkgo
and nifedipine (Procardia), a calcium channel blocking
drug used for blood pressure and arrhythmias.
Blood-thinning medications -- Ginkgo has blood-thinning properties and therefore should not be used if you are taking anticoagulant (blood-thinning) medications, such as aspirin, clopidogrel (Plavix), dipyridamole (Persantine), heparin, ticlopidine (Ticlid), or warfarin (Coumadin).