#vasoconstrictor__vasoconstrictive  any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure
  subtype:  adrenergic_drug  angiotensin  lypressin  naphazoline  vasopressor  low_temperature  noradrenaline  epinephrine  vasopressin  nicotine
  supertype:  agent  an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents"
     supertype:  causal_agent__cause__causal_agency  any entity that causes events to happen
        supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
           supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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