Zyrtec Drug

Important Information about Zyrtec Drug


  • Zyrtec is an antihistamine that decreases the natural chemical histamine in the body.
  • Zyrtec is used to avoid or treat symptoms of hay fever.
  • Zyrtec can cause side effects that may impair your thinking or reactions.
  • You should not use zyrtec if you are allergic to cetirizine.

Serious side effects:

  • Fast, pounding, or uneven heartbeat;
  • Weakness, tremors (uncontrolled shaking), or sleep problems (insomnia);
  • Severe restless feeling, hyperactivity;
  • Confusion;
  • Problems with vision; or
  • Urinating less than usual or not at all.

Less serious Zyrtec side effects may include:

  • Dizziness, drowsiness;
  • Tired feeling;
  • Dry mouth;
  • Sore throat, cough;
  • Nausea, constipation; or
  • Headache.