Unless there is a serious adverse reaction or after the doctor’s assessment that it is possible to stop the drug, patients who have been taking Mesylate for a month are not recommended to stop the drug blindly on their own. Mesylate hydrochloride tablets are class Ib antiarrhythmic drugs, which can be used for the treatment of chronic ventricular arrhythmias, such as ventricular tachycardia and premature ventricular contractions. Treatment with this drug is contraindicated in patients with cardiogenic shock, second or third degree atrioventricular block, sick sinus syndrome and breastfeeding women. Gastrointestinal adverse reactions such as nausea and vomiting, neurologic reactions such as dizziness, tremor and ataxia, and cardiovascular adverse reactions such as chest pain and arrhythmia may occur after taking this drug. Unless there are obvious adverse drug reactions that require immediate discontinuation, or the doctor has evaluated the patient’s electrocardiogram and other tests and believes that the drug can be discontinued, patients taking medication should not discontinue the drug on their own, and once discontinued, the symptoms may recur. Patients who need to use Mesylate for treatment are advised to use the drug under the guidance of a doctor, and should not blindly adjust the dose or stop the drug.