Loratadine vs Cetirizine: side-by-side comparison
Loratadine and Cetirizine belong to the same class (Second-generation H1 antihistamine). They share therapeutic approach but differ in mechanism nuances, half-life, side-effect profile and available formulations. This comparison summarises what is common and where they diverge.
| Property | Loratadine | Cetirizine |
|---|---|---|
| Therapeutic class | Second-generation H1 antihistamine | Second-generation H1 antihistamine |
| CAS | 79794-75-5 | 83881-51-0 |
| ATC | R06AX13 | R06AE07 |
| Molecular weight | 382.88 g/mol | 388.89 g/mol |
| Brands with this active ingredient | 1 | 1 |
What they share
Both are in the Second-generation H1 antihistamine class, giving them a common pharmacological architecture and many shared safety and management points. Choice within the class comes down to mechanism nuances, half-life, side-effect profile and individual response.
Key differences
Differences within the Second-generation H1 antihistamine class are what matter in practice: half-life, route of administration, equivalent doses, specific interactions, predominant side-effect profile and accumulated clinical experience. This page frames them; the prescribing information gives quantitative detail.
Mechanisms compared
Loratadine: Loratadin blockiert selektiv periphere H1-Histaminrezeptoren und antagonisiert die Wirkungen des bei allergischen Reaktionen freigesetzten Histamins. Cetirizine: Cetirizin blockiert selektiv periphere H1-Histaminrezeptoren und antagonisiert die Wirkungen des aus Mastzellen freigesetzten Histamins bei allergischen Reaktionen.
Indications compared
Loratadine: Loratadin ist bei Erwachsenen und Kindern zur Behandlung der allergischen Rhinitis, einschließlich saisonaler und perennialer Formen, sowie der chronischen idiopathischen Urtikaria zugelassen. Cetirizine: Cetirizin ist bei Erwachsenen und Kindern zur Behandlung von allergischer Rhinitis (saisonal und perennial), allergischer Konjunktivitis sowie chronischer idiopathischer Urtikaria zugelassen.
Safety profile
Loratadine: Loratadin wird in der Regel sehr gut vertragen. Cetirizine: Cetirizin wird im Allgemeinen gut vertragen.
Häufig gestellte Fragen
Is Loratadine better than Cetirizine? ▾
Neither is universally better. Loratadine and Cetirizine share the Second-generation H1 antihistamine class but differ in half-life, mechanism nuances and side-effect profile. The choice depends on the patient and the prescriber.
Can Loratadine and Cetirizine be combined? ▾
Combining two ingredients from the same Second-generation H1 antihistamine class is uncommon and, in most cases, adds no benefit over one at an appropriate dose. The decision is always the prescriber's.
Do they have the same side-effect profile? ▾
Partly yes — they share many Second-generation H1 antihistamine class effects, with nuances by mechanism and dose. The prescribing information lists differences.
Products with Loratadine
Products with Cetirizine
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