Metatron is also known as dronedarone hydrochloride tablets, 400mg * 20 tablets specifications of a box of roughly 300 yuan on the market, different regions, different channels of purchase of drugs prices vary, only as a reference. Dronedarone Hydrochloride Tablets is a kind of anti-arrhythmic drug, mainly applicable to patients with atrial fibrillation or atrial flutter. This drug is also used as a common drug after radiofrequency ablation of atrial fibrillation or atrial flutter, and is recommended by many domestic and foreign guidelines for long-term rhythm control in patients with paroxysmal or persistent atrial fibrillation. Dronedarone hydrochloride tablets have adverse effects such as causing heart failure, hypokalemia and hypomagnesemia of potassium-depleting diuretics, and QT prolongation. It is contraindicated in groups with hypersensitivity to the product, decompensated heart failure, heart failure category IV, severe atrioventricular block, permanent atrial fibrillation, severe hepatic injury, pregnancy, lactating women, bradycardia, concomitant use of potent CYP3A inhibitors. Self-selection of medication is not recommended, and it is recommended that treatment be carried out under the supervision of a specialist and in accordance with medical advice.