Introduction: Piper aduncum also known as matico is credited with antihypertensive, anti-inflammatory, healing effects. Objectives: To determine the antihypertensive activity of Piper aduncum ‘matico’ extract on L-NAME-induced hypertension in mice. Design: Experimental. Setting: Faculty of Medicine, and Faculty of Pharmacy and Biochemistry, National University of San Marcos, Lima, Peru. Biological material: Piper aduncum ethanolic extract leaves and mice. Interventions: Six groups of six Muss musculus mice each were used, one without hypertension (negative control) and four with L-NAME-induced hypertension: one positive control and three groups for 50, 150 and 300 mg/kg doses, respectively. Treatment was given orally once daily for 25 days. Measurements of systolic blood pressure (SBP), diastolic blood pressure (DBP) and mean arterial pressure (MAP) were performed twice weekly (Tuesd...