Sympathicolytic

The sympathicolytic and adrenolytic actions are masked in this case and are overshadowed by the pronounced central action of these alkaloids on the vasomotor center. […] Dihydroergocornine (DHO 180). Crude extracts of ergot are both oxytocic and sympathicolytic.

Source: wiktionary

This, we think, rather confirms Dr. Page’s findings that Apresoline inhibits somewhat specifically the effect of stimulation of the central end of the vagus, although some peripheral sympathicolytic effect is present too. / In contrast to the effect of these three drugs, the Rauwolfia alkaloid, Serpasil, has no sympathicolytic and no ganglionic blocking activity.

Source: wiktionary

Sympathectomy has been shown to alleviate allodynia in animal models, some patients with causalgia respond positively to sympathicolytic procedures, and injection of epinephrine in a stump neuroma may induce intense pain (Chabal et al. 1992; Choi and Rowbotham 1997; Attal and Bouhassira 1999).

Source: wiktionary

Bein: We have compared in the cat the influence of various drugs with a different point of attack (namely a sympathicolytic, “Regitine”; a ganglionic blocking substance, “pendiomide”; a phthalazine derivative, “Apresoline”; and a recently isolated alkaloid from Rauwolfia serpentina, “Reserpine” or “Serpasil”) on the blood pressure rise, produced either by stimulation of the central end of the vagus, or, for comparison, by adrenaline or by noradrenaline.

Source: wiktionary