My 13-year-old takes prescription levocetirizine dihydrochloride oral solution (2.5mg/5ml) each day for severe allergies during April and May. They take 10 milliliters once a day. This liquid medication works well. Is it safe for a 13-year-old to be taking this medicine every day for up to 10 to 12 weeks during the height of allergy season in Spring?
Yes, the long-term use of Xyzal (levocetirizine), a 'third-generation" antihistamine, is considered to be safe for most people.
In fact, the side effect profile for Xyzal with long-term use is very similar to its side effect profile with short-term use. The prescribing information for the drug states this explicitly: