How Do Claritin and Xyzal Work?
Claritin (loratadine) and Xyzal (levocetirizine) are both second-generation antihistamines that block H1 receptors to reduce allergy symptoms like sneezing, runny nose, itching, and hives. Xyzal is the active enantiomer of cetirizine (Zyrtec), making it more targeted, while Claritin metabolizes into its active form desloratadine (Clarinex) in the body.[1][2]
Which Lasts Longer and When Do They Kick In?
Claritin provides 24-hour relief with effects starting in 1-3 hours. Xyzal also lasts 24 hours but acts faster, often within 1 hour, and may feel stronger at equal doses due to higher potency.[1][3]
Drowsiness and Side Effects
Claritin is non-sedating for most users, with minimal drowsiness (under 8% report it). Xyzal causes drowsiness in about 6-14% of users, less than first-generation antihistamines but more than Claritin; avoid driving until you know its effect.[1][2][4]
Common side effects overlap: dry mouth, fatigue, headache. Xyzal users more often report somnolence; Claritin has rare liver risks at high doses.[3]
Dosage and Forms for Adults and Kids
| Feature | Claritin | Xyzal |
|---------|----------|-------|
| Adult dose | 10 mg once daily | 5 mg once daily |
| Kids (6+ months) | Liquid/dissolvable tabs from 6 months | Syrup/chewables from 6 months |
| Forms | Tablets, liquids, RediTabs | Tablets, liquids, melts |
Both are over-the-counter; no prescription needed for standard strengths.[1][2]
Cost and Availability
Claritin generics cost $10-20 for 30 tablets. Xyzal generics run $15-25 for 30 tablets, sometimes pricier due to later generic entry. Both widely available; store brands match efficacy.[5]
Who Should Pick One Over the Other?
Choose Claritin if avoiding any drowsiness (e.g., pilots, drivers). Opt for Xyzal for quicker relief or if Claritin falls short—studies show it superior for hives and nasal symptoms in some trials.[3][4] Neither for acute anaphylaxis; consult a doctor for allergies not responding.
Sources:
[1] https://www.drugs.com/compare/claritin-vs-xyzal
[2] https://www.webmd.com/allergies/claritin-vs-zyrtec-vs-xyzal
[3] https://www.goodrx.com/compare/claritin-vs-xyzal
[4] https://www.mayoclinic.org/drugs-supplements/loratadine-oral-route/description/drg-20067465 (Claritin profile); similar for levocetirizine
[5] https://www.goodrx.com/claritin, https://www.goodrx.com/xyzal