On occasion, your healthcare provider may recommend Zyrtec for something other than allergies or hives. Currently, there are no universally accepted off-label Zyrtec uses.
SIDE EFFECTS: Drowsiness, fatigue and dry mouth may occur. In children, stomach pain and vomiting may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. Tell your doctor immediately if any of these unlikely but serious side effects occur: yellowing eyes or skin, dark urine, persistent fatigue. A serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction include: rash, itching, swelling, dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.
DRUG CLASS AND MECHANISM: Cetirizine is the fourth addition to a new generation of allergy medications called "non- sedating" antihistamines or histamine (H-1) receptor blockers. These new antihistamines are called non-sedating because they cause less sedation than their predecessors; however, cetirizine is more sedating than the other non-sedating antihistamines.
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