Department of Pharmacognosy;
Faculty of Pharmacy;
University of Gezira;
Wad Medani;
Sudan;
Department of Pharmacology and Toxicology;
Medicinal and Aromatic Plant Research Institute;
National Centre of Research;
Khartoum;
Sudan;
Department of Pharmacology;
Faculty of Pharmacy;
University of Gezira;
Wad Medani;
Sudan;
P.; yohimbe; Bark; Isolated; Tissues; Aortic; Strip; Rat; Uterus; Relaxation; Nitric; Oxide;