Botanical Index No. 475 Greater Periwinkle vinca major Medicinal Actions Analysis pending research update. Primary Conditions Treated Bleeding Cardiopathy Congestion Constipation Convulsion Cramp Diarrhea Enterosis Enuresis Epistaxis Hemorrhoid High Blood Pressure Hysteria Leukorrhea Menorrhagia Nightmare Pulmonosis Sore Throat Tonsilosis General Dosage 2–4 g dry herb/cup tea to 3 ×/day.