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Clarinex/Allegra are antihistamines used to treat seasonal allergies such as hay fever. Physicians also recommend Allegra and Clarinex for the treatment of more chronic allergies to dust, mold and other environmental allergens. Allegra and Clarinex are not for us in treating food allergies, severe reactions to bug stings or bites or other significantly life threatening allergies that may require treatment with an EpiPen. Clarinex is available over the counter and Allegra requires a prescription from a physician. Both drugs are forms of antihistamines. Antihistamines are effective in treating hay fever in patients but can cause drowsiness in some patients. Both Clarinex and Allegra are versions of antihistamines that do not cause the same level of drowsiness as most antihistamines. Allegra does not cross the blood-brain barrier so it does not cause as much drowsiness as traditional antihistamines. Clarinex avoids causing drowsiness because it does not enter the central nervous system as other antihistamines do. Clarinex/Allegra are come in pill form and are available in various strengths. Allegra and Clarinex are safe for adults and children and both drugs have high levels of efficacy.

Warnings and Precautions

Allegra contains phenylalanine, which is a component of aspartame. Allegra D and other Allegra products do not contain phenylalamine. If you are allergic to aspartame you should not take allegra. Doctors do not know if Allegrea or Clarinex have any effect on an unborn fetus. Most doctors recommend that a patient not take Allegra or Clarinex while pregnant to avoid any possible impact to the unborn fetus. Doctors do not know at this time if the active ingredients of Allegra or Clarinex can pass to a baby through breast milk so consult with a physician if you are breastfeeding and want to take Clarinex or Allegra.

It is also important to tell you doctor if you are allergic to any medications or if you have kidney disease prior to beginning use of allegra or Clarinex.


Both Clarinex and Allegra are for the treatment of seasonal allergy symptoms such as itchy eyes, throat and nose, watery eyes and sneezing. Both Allegra and Clarinex have excellent clinical results in the treatment of seasonal allergies beginning in children 6 years of age through adults.

Side Effects

Some side effects that people experience from Allegra or Clarinex will require immediate medical attention, as they can be life-threatening issues. Side effects such as hives, swelling of the tongue, face, neck or throat and difficulty breathing all require immediate medical attention.

If a fever develops, cough, chills, body aches or other flu like symptoms occur, stop taking Allegra or Clarinex immediately and seek medical attention.

Side effects that are not as serious include menstrual cramps, backache and muscle pain, feeling tired or drowsiness and sometimes nausea, diarrhea and upset stomach occur.


Avoid taking Allegra or Clarinex with fruit juice and do not take antacids within 15 minutes of taking Allegra or Clarinex because antacids inhibit the absorption of the medication. Patients currently taking ketoconazole or erythromycin should tell their doctor about the medicaitons prior to starting clarinex or allegra.

All patients should tell their doctors about any and all medications they take because there may be other drugs that interact with allegra and clarinex.


The standard dosages for Allegra are 180mg per day for adults and children over 12, children ages 6 to 11 use 60mg per day. More than the recommended daily dosage can lead to overdose of Allegra.

Taking too much Clarinex or Allegra can be very harmful a patients long-term health. Symptoms of Clarinex or Allegra overdose include dry mouth dizziness or drowsiness. People who may be experiencing symptoms of a Clarinex or Allegra overdoes should seek immediate medical attention. Some patients may require a procedure commonly called stomach pumping, if doctors determine that immediate removal of the medication from the body is necessary.

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