It is not recommended to take propafenone for a long time, but if you are tolerant to propafenone and your condition requires it, you can take it orally for a long time under the guidance of your doctor, but long-term use of the drug will increase the risk of adverse reactions to the drug, so you need to follow up with your doctor regularly to monitor the adverse reactions. Propafenone belongs to class Ic antiarrhythmic drugs, the main ingredient is propafenone hydrochloride, applicable to the treatment of symptomatic supraventricular tachycardia. Generally, if the product is tolerated and the condition requires it, it can be taken for a long period of time under the supervision of a doctor. However, long-term use of the drug increases the incidence of adverse reactions, such as postural hypotension, chest pain, proarrhythmic effects, bitter mouth, numbness of the mouth, abdominal pain, liver damage, etc. Monitoring of liver and kidney function is required for long-term use. Propafenone interacts with metoprolol, cimetidine, erythromycin, phenobarbital and other drugs. If you really need to take this product, you need to use it under the guidance of a doctor. If the adverse effects are obvious, immediate medical consultation is required, and the doctor will decide whether it is necessary to stop the drug or change the medication regimen.