Serious and Uncommon Reactions to Zyrtec

Serious Zyrtec Side Effects

Some side effects with Zyrtec, while occurring infrequently, are potentially serious and should be reported immediately to your healthcare provider. As with most recently approved non-prescription products, Zyrtec is usually safe to use and rarely causes serious side effects. These serious side effects include but are not limited to:
  • Wheezing or other breathing problems
  • Difficulty passing urine
  • High blood pressure (hypertension)
  • A rapid heart rate (tachycardia) or a feeling of a rapidly or forcefully beating heart (known as heart palpitations)
  • Confusion
  • Anxiety
  • An increase in liver enzymes
  • Signs of an allergic reaction, such as:
    • An unexplained rash
    • Hives
    • Itching
    • Unexplained swelling, especially of the lips, mouth, or throat.

Less Common Zyrtec Side Effects

Rare Zyrtec side effects occur in less than 2 percent of people taking the drug. Because these side effects are so uncommon, it is difficult to tell whether they are caused by Zyrtec or something else.
These less common side effects include but are not limited to:
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Zyrtec Medication

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