Children and adults both frequently use over-the-counter antihistamines such as Zyrtec to treat common conditions such as seasonal allergies. As with all medications, Zyrtec -- also known by the generic name cetirizine -- can cause side effects. Some side effects develop only in children. And while decreased appetite does not occur as a side effect of the drug, some of the known side effects may lead to changes in appetite.
Zyrtec Uses in Children
The antihistamine action of Zyrtec makes in useful in treating many conditions common in children. In particular, Zyrtec and similar medicines help treat a runny nose, itchy and watery eyes, sneezing and other symptoms that commonly develop with allergies, the American Academy of Pediatrics reports. Other uses include treating itchy skin or rashes caused by conditions such as chickenpox, insects and allergic reactions.
Side Effects in Kids
In some cases, children may experience different side effects than adults when taking Zyrtec. Kids taking Zyrtec may experience both trouble sleeping and stomach pain, Drugs.com reports. And while decreased appetite may not directly occur because of taking Zyrtec, a child with stomach pain or an upset stomach may not seem as interested in eating or have the same appetite as before they were taking the medicine.
Other Side Effects
Most side effects of Zyrtec can occur in both children and adults. Common side effects include drowsiness, fatigue, excessive tiredness, diarrhea, vomiting and a dry mouth, MedlinePlus reports. Although these side effects may bother your child, none are serious or cause for concern. However, some side effects may indicate a potentially serious reaction. If your child develops difficulty breathing or swallowing while on Zyrtec, contact your pediatrician immediately.
How to Take It
Zyrtec comes in many forms, including some -- like a liquid suspension -- designed specifically for children. Other forms include chewable tablets, regular tablets and extended-release tablets. Instructions for use depend on what form your child takes, so always carefully follow the label directions. If your child takes other prescription or over-the-counter medicines, check with your doctor or pharmacist to prevent any dangerous interactions.
