Does Allegra (Fexofenadine) Work for Hives, and How Do You Use It Safely?
Allegra (fexofenadine) is a non-drowsy antihistamine that many people use to relieve the itching and welts of hives. Allegra is one of several non-sedating antihistamines doctors recommend as a first treatment for hives. This guide explains how it works, how the hives version differs from the allergy version, and how to take it safely.
How Does Allegra Work for Hives?
Fexofenadine blocks histamine, the chemical released in the skin during hives that causes swelling and itching. By blocking histamine’s effect, Allegra can reduce the number and size of welts and ease the itch. It reduces hives; it does not prevent every outbreak, and the label says it will not prevent hives or an allergic skin reaction from occurring.
Allegra Hives vs. Allegra Allergy
Allegra is sold in several versions. Allegra Hives is a 24-hour product with 180 mg of fexofenadine, labeled to reduce hives and relieve itching due to hives. Allegra Allergy products contain the same active ingredient but are labeled for seasonal allergy symptoms, such as sneezing and a runny nose. If you are buying an antihistamine specifically for hives, check the label to make sure the product is indicated for hives, and read the directions for the strength and age group.
How to Take Allegra Hives
Always follow the label on your product. For the 180 mg Allegra Hives tablet, the directions are:
- Adults and children 12 years and older: one tablet with water once a day, and no more than one tablet in 24 hours.
- Children under 12: do not use this product.
- Adults 65 and older, or people with kidney disease: ask a doctor first.
Important Safety Tips
- Avoid fruit juice. Apple, orange and grapefruit juice can reduce how much fexofenadine your body absorbs. Take it with plain water.
- Separate it from antacids. Do not take it at the same time as antacids containing aluminum or magnesium.
- Check with a doctor first if your hives are an unusual color, look bruised or blistered, or do not itch, since they may not be ordinary hives.
- Ask about pregnancy and breastfeeding before using it.
Is Allegra Non-Drowsy?
Fexofenadine is among the least sedating antihistamines, so most people can take it without becoming drowsy. Individual reactions vary, so see how it affects you before driving or doing anything that requires alertness.
How Long Does Allegra Take to Work for Hives?
Many people notice relief within a few hours. For chronic hives, steady daily use over several days or weeks may be needed to see the full benefit.
Allegra Compared With Other Antihistamines
Allegra, Zyrtec, Claritin and Xyzal all belong to the same family of non-sedating antihistamines, and individual response differs. If Allegra does not control your hives, a doctor might suggest another option or a higher dose. Compare them in our guide to the best antihistamine for hives, and see Zyrtec for hives.
When to Stop and See a Doctor
Stop taking Allegra and ask a doctor if:
- You have an allergic reaction to it
- Your symptoms do not improve after 3 days
- Your hives last longer than 6 weeks, which means they are chronic. Read about chronic hives.
Dr. Tiffany Young’s Hives Treatment Center in San Francisco provides online and in-person visits for hives that do not respond to over-the-counter medicine.
Emergency Warning Signs
Treat these symptoms as an emergency and call 911 if hives appear together with shortness of breath, a hoarse voice or trouble swallowing, swelling of the face, tongue or throat, a racing heartbeat, fainting, or vomiting and severe stomach cramps soon after a food, medication or insect sting. Do not wait to see whether they pass.
Allegra is not a substitute for emergency care or a prescribed epinephrine injector.
Frequently Asked Questions
Can I take Allegra for hives every day?
Doctors often recommend daily non-sedating antihistamines for chronic hives. Over-the-counter labels suggest asking a doctor if hives last more than 6 weeks.
Can I give Allegra Hives to my child?
The 180 mg Allegra Hives tablet is not for children under 12. Ask your pediatrician about the right product and dose for younger children.
Does Allegra help with hives from stress?
Antihistamines can ease the itching and welts regardless of the trigger, although they do not address the stress itself.
When Allegra Is Not Enough
If hives keep breaking through, there are further options. Visit our hives treatment page to see the latest treatment options for your outbreak.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. If you think you are having a medical emergency, call 911.
