Generic name of Metatron Hydrochloride, mainly used for the treatment of atrial fibrillation, atrial flutter and other cardiac arrhythmias, may have bradycardia, diarrhea, nausea and other side effects, it is recommended to follow the doctor’s instructions to use the drug. The mechanism of action of dronedarone hydrochloride tablets is currently unknown, clinically used for the treatment of paroxysmal or persistent atrial fibrillation or atrial flutter and other cardiac arrhythmias and other diseases. Administration of dronedarone can produce gastrointestinal irritation, such as diarrhea, nausea, dyspepsia and other symptoms. Due to the antiarrhythmic effect, it is also able to cause side effects such as bradycardia, prolongation of the QT interval, and may also cause allergic reactions with symptoms of rash and itching. It is contraindicated in case of allergy to the components of the drug, permanent atrial fibrillation, bradycardia, severe hepatic impairment, pregnancy and lactation, symptomatic heart failure, secondary or tertiary atrioventricular block. It is recommended that the medication be administered under medical supervision.