Contraindications

factors that makes administering a drug or carrying out a medical procedure inadvisable [Stedman's Medical Dictionary, 2004]

Contraindications

Noun: Any factor in a patient's condition that makes it unwise to pursue a certain line of treatment - such as drug therapy or surgery. Drugs often have contraindications on the bottle or on a leaflet that goes with the bottle.
Found on http://www.encyclo.co.uk/local/20555
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