Comparing Claritin and Allegra
Differences in UsesAllegra and Claritin are approved for the same uses. Both are approved to treat allergy symptoms and to treat chronic hives of unknown cause (known as chronic idiopathic uticaria). Depending on the particular form, both Allegra and Claritin are approved for use in children as young as two years old (Allegra in the syrup form and Claritin in the syrup or chewable tablet form).
There are little differences between these two medications when it comes to approved uses; this area is not very useful for deciding between the two.
Differences in EffectivenessSome studies suggest that Allegra (versus Claritin) may be more effective as an antihistamine. However, it is not clear if these differences are large enough to be noticeable.
Most importantly, different people react in different ways to medications. One person may find Claritin to be much more effective, while the next person may discover that Allegra is more effective. This same idea is applicable to side effects -- some people find Claritin causes less drowsiness, while others find that Allegra is better in this aspect. In the area of nonsedating antihistamines, people usually form strong preferences toward or against certain medications.