Propranolol (CAS No 525-66-6) is a non-selective beta-adrenergic receptor blocker used extensively in cardiovascular research It originates from synthetic processes and functions by inhibiting beta-1 and beta-2 adrenergic receptors affecting pathways related to heart rate and vascular dynamics Its mechanism of action involves modulating sympathetic nervous system activity making it useful for studying heart rate reduction and arrhythmia control In vitro propranolol exhibits activity in the nanomolar to low micromolar range demonstrating effective receptor blocking capability It is widely applied in cell models to investigate cardiac function and in animal studies to understand its effects on heart rate and blood pressure Propranolol is also used in drug screening to evaluate treatments for cardiovascular disorders Experimental concentrations typically depend on the specific research design ensuring precise alignment with study objectives