Home Herbs Index A Asrol (Rauwolfia serpentina) (Snake root) AllABCDEFGHIJKLMNOPQRSTUVWXYZ Asrol (Rauwolfia serpentina) (Snake root) Pharmacological action: Antihypertensive, sedative, psychotropic. Medicinal use: Effective in hysteria, high blood pressure, insomnia and irritative conditions of the central nervous system.