Antihistamines work by blocking a substance called histamine in your body. Histamine is known for causing allergy symptoms. Blocking it helps prevent symptoms of seasonal allergies or hay fever. Both Allegra and Zyrtec are effective at treating allergy symptoms and take a similar amount of time to start working.

Allegra Allergy medication is available over the counter at most grocery stores and pharmacies.

Allegra works within two hours and Zyrtec works within one hour. Several studies have found cetirizine (Zyrtec) to be more effective than fexofenadine (Allegra) at relieving symptoms of allergic rhinitis and urticaria, and it appears to have a longer duration of action.

Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Allegra is used to treat the symptoms of seasonal allergies (hay fever) in adults and children. Allegra is also used to treat skin itching and hives caused by a condition called chronic idiopathic urticaria in adults and children.

Newer antihistamines like Allegra and Claritin are generally safe for daily use. But allergy medications with decongestants, such as Claritin-D or Benadryl-D, could make your allergies worse with long-term use.

Take this medication by mouth on an empty stomach (at least 1 hour before or 2 hours after a meal). Take this medication with water. Do not take with fruit juices (such as apple, grapefruit, or orange) since they may decrease the absorption of this drug.

Fexofenadine is an antihistamine medication that comes in a capsule or tablet form. It treats and prevents symptoms of allergies like itchy eyes, sneezing and hives. It works by blocking histamine in your body. A common brand name of this medication is Allegra®.

Non-drowsy - unlike first-generation antihistamines Allegra® Hives reduces hives all day long in the preferred oral form. That's 24 hours of inside-out relief from itching due to hives without the drowsy feeling that comes with first-generation antihistamines.

When comparing Allegra, Zyrtec, and Claritin, remember that: Allegra is less likely to make you drowsy. Zyrtec and Allegra work faster than Claritin. All three work well to treat hives and symptoms of hay fever, such as itchy skin and eyes and post-nasal drip.

Side Effects of Mixing Allegra and Zyrtec Side effects with both of these medicines are the same, and taking them together could compound those effects without relieving your symptoms any better, says Hill. Per the National Library of Medicine, side effect include: sleepiness. tiredness.

Newer antihistamines like Allegra and Claritin are generally safe for daily use. But allergy medications with decongestants, such as Claritin-D or Benadryl-D, could make your allergies worse with long-term use.

Allegra 120mg tablet is an anti-allergic medicine. It is used for the treatment and management of allergies. This tablet relieves watery eyes, runny or blocked nose, itching, sneezing and swelling. It also helps relieve skin allergy symptoms (hives), such as skin rash, itching and swelling.