Epinephrine is vasoconstrictor or vasodilator?

Epinephrine mainly acts as a vasoconstrictor

Does epinephrine constrict or dilate blood vessels?

Epinephrine is a vasoconstrictor overall because it activates alpha-adrenergic receptors (especially α1), which cause blood vessels to tighten and raise blood pressure.

Why do some sources say epinephrine can also dilate vessels?

Epinephrine can dilate blood vessels in certain vascular beds because it also activates beta-adrenergic receptors (especially β2), which can relax vascular smooth muscle. In practice, the alpha effects usually dominate systemically, so the net effect is vasoconstriction.

What does this mean clinically (for anaphylaxis, for example)?

In conditions like anaphylaxis, epinephrine is used to counter low blood pressure and shock by increasing vascular tone (vasoconstriction), while also helping airways and circulation through its mixed receptor actions.