Cardio, or propranolol, has a duration of action of approximately 4 hours. Propranolol is a non-selective beta-blocker, mainly with negative inotropic effects, used for heartbeat control, commonly used in the treatment of coronary artery disease, angina pectoris, myocardial infarction, hypertrophic cardiomyopathy, hypertension, arrhythmias, idiopathic subaortic stenosis and other cardiac diseases, but also for patients with hyperthyroidism, pheochromocytoma, migraine, to improve the patient’s palpitation symptoms. The clearance half-life of such drugs is 3-4 hours, and the effect begins to take effect in 1-3 hours of oral administration, and the duration of drug maintenance is about 4 hours, i.e., after taking 1 capsule of Takeostasis, the effect can be maintained for 4 hours. There may be adverse reactions to taking Takeostasis, such as slowed heart rate, neurological symptoms, etc. After taking if there is discomfort immediately stop the drug and promptly seek medical attention.