Medically reviewed by Lindsay Cook, PharmD Key Takeaways Common side effects of Zyrtec include sleepiness, tiredness, and dry ...

Cetirizine is available as an over-the-counter (OTC) generic drug that comes in oral forms, including an oral tablet and solution. The usual dosage is 5 to 10 milligrams (mg) once per day, with a ...

Zyrtec can be given to children to treat allergy symptoms, but it may cause mild side effects like drowsiness and dry mouth.

Zyrtec and Xyzal are approved by the FDA for over-the-counter use. You can find plenty of Reddit threads with folks discussing their allergies getting worse. Many users also discuss the right way to ...