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I killed the link between "pressors" and "vasoconstrictors" because it will be misleading to novices.
Most 'pressors' (drugs which increase the blood pressure) act via multiple mechanisms, including improving cardiac contractility and vasoconstriction. Some (dopamine, epinephrine) have dose-dependent effects.
Many vasoconstrictors are poor ionotropes (e.g. PE, which becomes really clear when you have someone on a non-selective beta-blocker).
This article was the subject of a Wiki Education Foundation-supported course assignment, between 2 January 2023 and 30 June 2023. Further details are available on the course page. Student editor(s): DunkelThomas (article contribs).