Allegra Gelcaps start working in one hour to give you round-the-clock relief from sneezing, runny nose, itchy and watery eyes, and itchy nose or throat. One pill is all you need for 24-hour relief.

Relieve your hay fever and allergy symptoms like runny nose, sneezing, itchy, watery eyes, itchy nose, or itchy throat. Allegra® starts working in one hour - twice as fast as Claritin* - and won't leave you feeling drowsy like Zyrtec. That is why it's the #1 allergist recommended non-drowsy allergy brand.

Stop using fexofenadine (Allegra) to relieve hives and contact a provider if your symptoms don't get better after 3 days of taking the medication or if your hives last more than 6 weeks. There might be a better treatment for you.

Trials have shown both Allegra (fexofenadine) and Claritin (loratadine) are significantly more effective than placebo (a pretend pill) for reducing symptoms associated with allergic rhinitis, hay fever, and other allergies.

Allegra Tablets start working in one hour to give you relief from your worst allergy symptoms, such as sneezing, runny nose, itchy and watery eyes, and itchy nose or throat. Each allergy pill provides 12 hours of relief; take up to two pills daily.

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.

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.

Don't take more than 180 mg (1 pill) in 24 hours. Allegra 24 Hour contains 180 mg of fexofenadine per dose and should last for 24 hours. It comes available as tablets and gelcaps. There's also a version called Allegra Hives.

Decongestants, like Sudafed (pseudoephedrine) and Afrin (oxymetazoline), can provide relief in less than 30 minutes. Antihistamines, like Claritin (loratadine) and Zyrtec (cetirizine), start working within a few hours. Nasal steroid sprays, like Flonase (fluticasone), can take up to 2 weeks to fully kick in.

Dizziness, trouble sleeping, nausea, or headache may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. An empty tablet shell may appear in your stool. This effect is harmless because your body has already absorbed the medication.

Allegra Tablets start working in one hour to give you round-the-clock relief from sneezing, runny nose, itchy and watery eyes, and itchy nose or throat. One pill is all you need for 24-hour relief.

Allegra Tablets start working in one hour to give you relief from your worst allergy symptoms, such as sneezing, runny nose, itchy and watery eyes, and itchy nose or throat. Each allergy pill provides 12 hours of relief; take up to two pills daily.