<prompt> A 70 year old man develops pneumonia and septicemia. Patient goes into renal failure and has a BP of 7050 mm of Hg. Drug that should be used to maintain BP is -AdrenalineEphedrinePhenylephrineNor epinephrine  <response>: Norepinephrine NE, also called noradrenaline NA or noradrenalin, is an organic chemical in the catecholamine family that functions in the brain and body as a hormone and neurotransmitter. The general function of norepinephrine is to mobilize the brain and body for action Norepinephrine exes its effects by binding to a- and b-adrenergic receptors or adrenoceptors, so named for their reaction to the adrenal hormones in different tissues. In the blood vessels, it triggers vasoconstriction narrowing of blood vessels, which increases blood pressure Norepinephrine is similar to adrenaline. It works by constricting narrowing the blood vessels and increasing blood pressure and blood glucose sugar levels. Norepinephrine is used to treat life-threatening low blood pressure hypotension that can occur with ceain medical conditions or surgical procedures Ref Davidson 23rd edition pg 466 