(1) Emesis may result from stimulation of the vasomotor and vomiting centers.(2) The alkaloids stimulated the vasomotor and respiratory centers in the brain stem of dogs.(3) The authors conclude that 100 mg per day of isoflavone effectively relieved menopausal symptoms, especially vasomotor instability.(4) Dietary phytoestrogens, found in soya bean and linseed, are thought to help relieve vasomotor menopausal symptoms.(5) One study found that approximately 25 percent of menstruating women in midlife reported vasomotor symptoms before they had skipped one or several periods.(6) As a central nervous system depressant, black cohosh directly inhibits vasomotor centers involved with inner ear balance and hearing.(7) Nonallergic rhinitis, also called vasomotor rhinitis, is a condition in which the lining of your nose tends to swell due to the blood vessels expanding.(8) Estrogen was the most consistently effective intervention for vasomotor symptoms.