Quzyttir vs. Allegra

Are Quzyttir and Allegra the Same Thing?

Quzyttir (cetirizine hydrochloride injection) and Allegra (fexofenadine hydrochloride) are antihistamines used to treat hives (urticaria).

Allegra (fexofenadine hydrochloride) is also used to treat other allergic symptoms of seasonal allergic rhinitis, including sneezing, runny nose, and itchy or watery eyes.

Allegra is available over-the-counter (OTC) and as a generic.

Side effects of Quzyttir and Allegra that are similar include headache, drowsiness/sleepiness, and fatigue/tiredness.

Side effects of Quzyttir that are different from Allegra include changes in taste, numbness and tingling, lightheadedness, indigestion, feeling hot, increased sweating, dry mouth, sore throat, and dizziness.

Side effects of Allegra that are different from Quzyttir include nausea, diarrhea, upset stomach, muscle or back discomfort or pain, and menstrual cramps.

Quzyttir may interact with theophylline.

Allegra may interact with ketoconazole, erythromycin, and other medicines that make you sleepy (cold or allergy medicines, sedatives, narcotics, sleeping pills, muscle relaxers, and medicines for seizures, depression, or anxiety).

What Are Possible Side Effects of Quzyttir?

Common side effects of Quzyttir include:

  • changes in taste,
  • headache,
  • numbness and tingling,
  • lightheadedness,
  • indigestion,
  • feeling hot,
  • increased sweating,
  • drowsiness,
  • fatigue,
  • dry mouth,
  • sore throat, and
  • dizziness

What Are Possible Side Effects of Allegra?

Common side effects of Allegra include:

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

Contact your doctor if you have serious but less common side effects of Allegra including:

What Is Quzyttir?

Quzytiir (cetirizine hydrochloride injection) is a histamine-1 (H1) receptor antagonist used to treat acute hives (urticaria) in adults and children 6 months of age and older.

What Is Allegra?

Allegra (fexofenadine hydrochloride) is an antihistamine used to treat allergic symptoms of seasonal allergic rhinitis, including:

  • sneezing,
  • runny nose,
  • itchy or watery eyes, and
  • urticaria (hives)


Allergies can best be described as: See Answer

What Drugs Interact With Quzyttir?

Quzytiir may interact with other drugs. Tell your doctor all medications and supplements you use. Tell your doctor if you are pregnant or plan to become pregnant before using Quzytiir; it is unknown how it would affect a fetus. Quzytiir passes into breast milk. Consult your doctor before breastfeeding.

What Drugs Interact With Allegra?

Allegra may interact with:

  • ketoconazole, or
  • erythromycin

Allegra may also interact with other medicines that make you sleepy such as:

  • cold or allergy medicine,
  • sedatives,
  • narcotic pain medicine,
  • sleeping pills,
  • muscle relaxers, and
  • medicine for seizures, depression, or anxiety

How Should Quzyttir Be Taken?

The recommended dose of Quzytiir for adults and adolescents 12 years of age and older is 10 mg. The recommended dose of Quzytiir for children 6 to 11 years is 5 mg or 10 mg. The recommended dose of Quzytiir for children 6 months to 5 years is 2.5 mg.

How Should Allegra Be Taken?

Allegra is available in several strengths and forms; as tablets in strengths of 30, 60 and 180 mg, as 30 mg fast orally disintegrating tablets (available in foil blister packs and labeled "ODT"; the drug should not be touched by skin as it may begin to dissolve and reduce the oral dose) and as an oral suspension of 30mg per 5 ml. The dosage is dependent on the age, weight and effectiveness of the drug; special care should be taken when prescribing this drug to infants and children to make sure the recommended dosage is given.


Could I Be Allergic? Discover Your Allergy Triggers See Slideshow

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TerSera Therapeutics LLC. Quzyttir Drug Information.


Sanofi-aventis. Allegra Product Information.


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