disposition contraindication Yongqun He, Sirarat Sarntivijai, Mathias Brochhausen, William Hogan, ‎Philip E. Empey A contraindication is a disposition that increases the risk of harm involved in using a particular drug, carrying out a medical procedure, or engaging in a particular activity such that the risk of harm exceeds a threshold. An contraindication serves as a reason to withhold a certain medical treatment. http://en.wikipedia.org/wiki/Contraindication