Extract from leaf of Psidium guajava L depresses the guinea pig atrial contractility by interfering with potassium and calcium channels . Braz. J. Pharm. Sci. [Internet]. 2009 Sep. 1 [cited 2024 May 3];45(3):483-9. Available from: https://www.revistas.usp.br/bjps/article/view/10705