A contraindication includes anything (for example, a symptom, another drug, or medical condition) that is a reason for a person to not receive a particular drug because of possible harmful effects 1. Having increased bleeding  (hemorrhagic) tendencies, for example, is a contraindication for taking Warfarin because treatment with this drug may cause excessive bleeding.

DrugBank contraindications describe specific cases in which an individual drug is contraindicated. This contraindication may be associated with patient conditions, age-group, patients taking specific drugs, administration by certain routes, and other factors (see all factors).


  1. NCI Dictionary: Contraindication [Link]