What is the definition or description of: nitroprusside sodium allergy?

Drug reaction: An allergy to nitroprusside could be as mild as a mild rash or as severe as difficulty breathing as well as other adverse effects. In addition to allergy are the potential toxicities, including severely reduced blood pressure as well as cyanide toxicity. The drug should be used only by those who are trained to manage life-threatening hypertensive emergencies and those with severe heart failure.