The Allegra -D 24 Hr 10ct Tablets are good when your allergy symptoms include nasal congestion and sinus pressure. They offer a powerful nasal decongestant that start working in one hour to give relief from sneezing, runny nose, itchy, and watery eyes. One pill is all you need for 24 hour allergy and congestion relief.

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.

It contains 2 medications: fexofenadine and pseudoephedrine. Fexofenadine is an antihistamine that helps relieve watery eyes, itchy eyes/nose/throat, runny nose, and sneezing. Pseudoephedrine is a decongestant that helps relieve stuffy nose and ear congestion symptoms.

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.

If you want to be sure your allergy medication won't impair your everyday functioning, take it at night before you go to bed - or take fexofenadine (Allegra) (1%–3%), which is the least likely to make you drowsy.

The chances of experiencing drowsiness with Allegra are very low. In fact, it's one of the antihistamines that's least likely to make you feel sleepy. But drowsiness with Allegra is still possible. The risk of drowsiness is higher if you also take other medications that make you tired, or if you drink alcohol.

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.

Cough, fever, or stomach upset may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. If your doctor has prescribed this medication, remember that your doctor has judged that the benefit to you is greater than the risk of side effects.

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.

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.

Studies point to Claritin being more effective than Allegra for allergic rhinitis (faster onset of action, more symptom relief) Allegra may provide more eye symptom relief. Studies suggest Allegra may be more effective than Claritin for wheal and flare reactions (an allergic skin reaction).

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.