Yes, Allegra is the same as fexofenadine. Every medication has two names, a brand and a generic name. The original creators are the only ones who can use the brand name.
Once the recipe becomes available to other drug manufacturers, they sell the product under the generic name. It usually takes approximately seven years for the brand to go generic. The main active ingredient has to remain the same in each recipe.
What differs from the brand and generic are the inactive ingredients that can hold the medication together and that give it its color. In addition, the generic can be much more affordable. Most generics are FDA approved to be equally effective. Therefore, if the generic works for you then there is no need to switch.
Also, make sure to only take one and not both the brand and generic to prevent overdosing and additive side effects.
Important: The opinions expressed in WebMD User-generated content areas like communities, reviews, ratings, blogs, or WebMD Answers are solely those of the User, who may or may not have medical or scientific training. These opinions do not represent the opinions of WebMD. User-generated content areas are not reviewed by a WebMD physician or any member of the WebMD editorial staff for accuracy, balance, objectivity, or any other reason except for compliance with our Terms and Conditions. Some of these opinions may contain information about treatments or uses of drug products that have not been approved by the U.S. Food and Drug Administration. WebMD does not endorse any specific product, service, or treatment. Do not consider WebMD User-generated content as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.