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Aims: The aim of this study was to investigate the possible hypotensive and diuretic effects of ethanolic extract of Urtica circularis (Hicken) Soraru (Urticaceae) using preclinical methods. Place and Duration of Study: Department of Pharmacology, School of Pharmacy and Biochemistry, Universidad de Buenos Aires, from July 2015 to January 2016. Methodology: Effect on blood pressure and heart rate on anaesthetized normotensive and hypertensive rats were measured using Statham Gould P23ID pressure transducer coupled to a Grass 79D polygraph. Rats were placed in metabolic cages in order to collect urine. Urinary volume was measured and sodium and potassium concentration was estimated from each urine sample using indirect ion-selective electrode potentiometry. The vasorelaxant activity of major compound was studied using isolated aortic rings. Antioxidant activity was estimated measuring 2,2 diphenyl 2 picryl hydrazyl hydrate radical scavenging activity. Results: The intravenous administration of the extract of U. circularis (0.1‐30 mg/kg) in

Acute Hypotensive, Diuretic and Antioxidant Activities Induced by Urtica circularis