Independent side-by-side comparison.
Neither is clearly "better" — Allegra (fexofenadine) and Claritin (loratadine) are both second-generation, non-drowsy antihistamines that work about equally well for allergy symptoms, so the right choice comes down to small practical differences and how your own body responds.
They are clinically very similar, not the same molecule: both are second-generation H1 antihistamines (different active ingredients) that block histamine to relieve runny nose, sneezing, itchy/watery eyes, and hives, and both are classed as non-drowsy and taken once daily. The NHS states there is not much evidence any one non-drowsy antihistamine relieves symptoms better than another, and that people may need to try several to find one that suits them. The main real-world differences are practical, not in effectiveness: fexofenadine (Allegra) should not be taken with grapefruit, orange, or apple juice (they can make it work less well), a caution that does not apply to loratadine; and drowsiness, though listed as "non-drowsy," is still possible with both (the NHS notes some people find fexofenadine makes them feel sleepy).
Either is fine for typical hay fever or hives, but you might lean to Allegra (fexofenadine) if loratadine hasn't worked well for you and you want to try a different non-drowsy option, or if you don't mind avoiding fruit juices around your dose. Allegra also covers hives (urticaria), as does Claritin.
Either is fine, but Claritin (loratadine) may be the simpler pick if you want to avoid the fruit-juice timing restriction that comes with fexofenadine, or if loratadine has reliably worked for you before. Per NHS, loratadine is also usually the recommended antihistamine if you need one during pregnancy — but confirm any pregnancy or breastfeeding use with your doctor or pharmacist.
This is essentially a tie: both are once-daily, non-drowsy, second-generation antihistamines with no strong evidence that one outperforms the other, so pick based on practical factors — avoid Allegra with fruit juice, consider Claritin (loratadine) in pregnancy on medical advice, and if one doesn't relieve your symptoms it's reasonable to try the other. For ongoing symptoms, pregnancy/breastfeeding, or other medications, check with a pharmacist or doctor.
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Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.