Natural cure for arrhythmia? Is there any way to treat arrhythmia without prescription medication?

No and Yes. There is no natural cure for an arrhythmia. There are some circumstances where an arrhythmia may resolve without treatment, but these are uncommon. There is a procedure, known as catheter ablation, that can be performed to eliminate an arrhythmia and avoid the need for prescription medication.
There. There are many types of arrhythmias, ranging from nuisances to life-threatening conditions. The treatment depends on the type and severity of the arrhythmia. Some can be treated without prescription drugs, and some don't require treatment at all. For example, one common arrhythmia in healthy people called paroxysmal supraventricular tachycardia, can often be treated with simple maneuvers like coughing or specific breathing exercises. Whether or not to take a medication always depends on the balance between the risk of the condition and the risk or burden of the treatment. If you have an arrhythmia, you should talk with your doctor and be sure to ask what all the treatment options are including those that do not involve prescription drugs.