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.

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.

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.

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.

To sum it up, all first-generation H1 antihistamines should be taken close to bedtime or when you're able to sleep. Second-generation H1 antihistamines and H2 blockers can typically be taken at any time of the day. One exception to this is cetirizine, which can cause drowsiness for up to 14% of those who take it.

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.

Allegra is an antihistamine that reduces the effects of natural chemical histamine in the body. 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.

Common side effects of Allegra include:

• nausea,
• diarrhea,
• upset stomach,
• muscle or back discomfort or pain,
• sleepiness,
• drowsiness,
• tiredness,
• headache, and.

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.

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 the Allegra disintegrating tablet on an empty stomach, at least 1 hour before or 2 hours after a meal. Tell your doctor if your symptoms do not improve, or if they get worse after you start taking Allegra. Never use more than the recommended dose.

FEXOFENADINE (fex oh FEN a deen) prevents and treats allergy symptoms, such as red, itchy eyes, sneezing, a runny or stuffy nose, or hives. It works by blocking histamine, a substance released by the body during an allergic reaction. It belongs to a group of medications called antihistamines.