Allegra 120 is a fast-acting, non-sedating antihistamine that offers reliable relief from allergy symptoms with once-daily dosing. When taken properly—without interacting foods or drugs—it can be an effective and well-tolerated treatment for both seasonal and chronic allergy sufferers. Certain people should use Allegra 120 with caution. This includes individuals with kidney problems, as the drug is excreted through the kidneys. It’s important to consult a doctor before use if you are pregnant, breastfeeding, or taking other medications that could interact, such as antacids containing aluminum or magnesium, which can also reduce Allegra 120’s effectiveness.