Angiogenesis, which plays a significant role in a variety of physiological processes, such as embryonic growth and wound healing, is strictly delimited and finely tuned by a balance of proangiogenic and antiangiogenic factors. Cardiac rhythm disorders are diseases that are often accompanied by vascular pathologies. As such, the purpose of this study was to investigate the antiangiogenic effects of Amiodarone HCl in the chorioallantoic membrane model. In this study, the antiangiogenic effect of Amiodarone HCl was compared with a positive control group that was given pure paraffin and the vascular endothelial growth factor inhibitor Bevacizumab, as well as a negative control group in which clearly antiangiogenic activity was shown in this model previously. Concentrations of 10(-4), 10(-5), and 10(-6)M of each drug were administered. For the purpose of determining the antiangiogenic effects of the drugs, blood vessels of the chorioallantoic membranes were evaluated using a stereoscopic microscope. The antiangiogenic effect scores of Amiodarone HCl at the dose of 10(-4) molar (M) were higher than those of 10(-5)M and 10(-6)M, but that result was statistically insignificant. The antiangiogenic effect scores of Bevacizumab at the concentrations of 10(-4)M and 10(-5)M were significantly higher than that of 10(-6)M. This effect of Amiodarone may be important for determining routine antiarrhythmic doses.