2 doctors weighed in:
Why would atenolol taken for tachycardia quit working as well after years of usage?
2 doctors weighed in

Dr. Andrew Kaplan
Internal Medicine - Cardiology
1 doctor agrees
In brief: Tolerance
Any medical problem may change over time, making medication less effective.
Arrhythmias may become more prone to occur based on changes in the circuit or underlying heart condition. Other medications may also have an influence.

In brief: Tolerance
Any medical problem may change over time, making medication less effective.
Arrhythmias may become more prone to occur based on changes in the circuit or underlying heart condition. Other medications may also have an influence.
Dr. Andrew Kaplan
Dr. Andrew Kaplan
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