No interactions like this have ever been reported. Dizziness and drowsiness are the most common side effects of Zyrtec. Allegra has the same antihistamine properties as Zyrtec without the drowsiness.
Please consult your doctor about your chest pains as it may be something serious.
While taking Cymbalta my blood pressure went up so I asked my doctor about this and he said it couldn't be the Cymbalta. But high blood pressure is a listed side effect and this Dr also insisted I had IBS when I did not. However, I wouldn't ignore chest pains.
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