I'm just wondering does coreg (carvedilol) have histamine in it?

Beta Blockers: Nope. Coreg (carvedilol) is a beta blocker which means it interacts with the beta adrenergic receptors to avoid its given function. Coreg (carvedilol) is able to block b1,b2 and alpha 1 receptors being and for this it is considered non-selective beta blocker. The adrenergic receptors are a class of G protein-coupled receptors that are targets of the catecholamines, especially norepinephrine and epinephrine Cheers C