There are several serious side effects with verapamil that you should report immediately to your healthcare provider. These include, but are not limited to:
Chest pain
An irregular heart rhythm (arrhythmia) or a slow heart rate (bradycardia)
Heart attacks or strokes
Significant water retention, especially accompanied by difficulty breathing (signs of congestive heart failure, or CHF)
Signs of very low blood pressure, such as dizziness, lightheadedness, or fainting
Hallucinations or other psychotic problems
Breast enlargement in men (gynecomastia)
Signs of an allergic reaction, including an unexplained rash, hives, itching, unexplained swelling, wheezing, or difficulty breathing or swallowing.
Rare Verapamil Side Effects
There are other possible verapamil side effects that can occur. These rare verapamil side effects occur in less than 1 percent of people. For these side effects, it is difficult to tell whether the side effect is actually caused by verapamil or something else.
Some of these rare verapamil side effects include, but are not limited to:
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