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.

Sanofi-Aventis' Allegra-D available in USA - Pharmaceutical industry.

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. Allegra may also be used for purposes not listed in this medication guide.

While it's generally well tolerated, it may cause side effects for some people. Common Allegra side effects include headache, indigestion, and dry mouth. Very rarely, people may experience drowsiness or fatigue after a dose. Side effects from Allegra are usually mild and can be managed at home.

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.

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.

Did you know that a researcher at Georgetown University discovered Allegra? Dr. Raymond Woolsey originated the medication that changed the way allergies are treated. An allergy is a condition in which the immune system reacts abnormally to something foreign, such as pollen.

Allegra 120 MG Description It also helps relieve skin allergy symptoms (hives), such as skin rash, itching and swelling. Allegra 120mg tablet contains fexofenadine as an active ingredient. Fexofenadine works by blocking the effects of histamine, a substance that causes allergy symptoms.

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.

Caution is advised if you have diabetes, phenylketonuria (PKU), or any other condition that requires you to limit/avoid these substances in your diet. Ask your doctor or pharmacist about using this product safely. During pregnancy, this medication should be used only when clearly needed.

Medications that often can be safely used by people with significant allergies include nasal corticosteroids. In addition, antihistamines such as fexofenadine (Allegra), cetirizine (Zyrtec), loratadine (Claritin) and diphenhydramine (Benadryl) are very effective.

Allergists recommend long-acting, non-sedating antihistamines - ones that won't make you sleepy - for everyday use. Though you may know them by their brand names, the generic versions tackle the same problems: Cetirizine (Zyrtec®, Aller-Tec®, Wall-Zyr®). Fexofenadine (Allegra®, Aller-ease®, Aller-Fex®, Wal-Fex®).