About Zyrtec, Generic Zyrtec, Centirizine, Buy Zyrtec, FillMyScript.org

Zyrtec, Generic Zyrtec, Cetirizine

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About Zyrtec, Generic Zyrtec, Centirizine, Buy Zyrtec, FillMyScript.org

About Zyrtec, Generic Zyrtec, Centririzine, Buy Zyrtec, FillMyScript.orgAbout Zyrtec

Zyrtec (Cetirizine) is an antihistamine also known as Reactine. Antihistamines are prescribed medicines to treat symptoms of hay fever and other allergic reactions. As it name suggests, antihistamines work by opposing histamines. Histamines are the major causes of itching, sneezing, runny nose, and watery eyes. At times, histamines may cause more than these symptoms; they may block the passage of the lungs which are the bronchial tubes that could make breathing difficult. That is when antihistamines are prescribed to ease up the action caused by histamines and such a drug is Zyrtec.


Aside from the prevention of allergies, another function of Zyrtec (Centirizine) is to inhibit motion sickness, nausea, vomiting, and dizziness.

Some antihistamines may used to treat chronic uticaria, a persistent rash that looks like hives.

Side Effects

One of the most common side effects of Antihistamines, including Zyrtec (Cetirizine) is drowsiness. Expect a sleepy feeling when on Zyrtec (Cetirizine) medication. This effect of Antihistamines is often used to put people to sleep.

In children, serious side effects of Zyrtec (Cetirizine) might reach up to convulsions in younger patients, unusual irritability as well as unusual excitement and nightmares may likely happen.

In adults, some of the serious side effects may entail difficulty in urination, dizziness, faint feeling, mouth, nose and throat dryness, and also irritability and unusual excitements.


Always talk to your doctor first if you have known or unknown allergic reactions to antihistamines and if you have allergies towards foods, preservatives or dyes.

Also take time to inform your doctor about your diet. It is an important consideration that you refer to your doctor if you observe a low fat diet, low protein diet or if you regularly drink alcoholic beverages as they may have an effect on taking Zyrtec (Centrizine).

Pregnancy and Zyrtec (Cetirizine) have not been studied but drugs that contain cetirizine have not been shown to cause birth defects in pregnant women. However, it has been noticed that certain amounts of antihistamine may be passed on through breast milk. Babies are more prone to catch the side effects of antihistamines and among the side effects are unusual excitements or irritability. The flow of breast milk might also be decreased.

If you are taking sedatives or tranquilizers, never take this medicine without your doctor's approval.

Drug Reactions

Zyrtec (Cetirizine) may react with the following medicines, so consult your doctor first if you are taking them or planning to take medicines belonging to the list below:

  • Anticholinergics
  • Erythromycin
  • Ketoconazole - use of this medicine may increase of fexofenadine in the blood
  • Central Nervous System depressants
  • Monoamine Oxidase inhibitors - this medicine should never be used together with Zyrtec (Cetirizine)

When you also have medical problems such as the following:

  • Enlarged Prostate
  • Urinary difficulties - Zyrtec (Cetirizine) may worsen the condition
  • Glaucoma - Zyrtec (Cetirizine) may increase eye pressure and worsen the problem
  • Intestinal Impediments
  • Stomach Ulcers
  • Liver Diseases
  • Kidney Diseases

Consult your doctor for advice on whether to stop your Zyrtec (Cetirizine) treatment or whether your dosage will be significantly lowered.


Always follow your doctor's prescribed dosage.

Missed Dose

When you happen to miss a dose, it is preferable if you entirely skip that dose and proceed to the dosage for the next day. It is not advised to take double doses of Zyrtec (Cetirizine).


Symptoms of overdose include clumsiness, seizures, severe drowsy feeling, severe dryness of nose, mouth and throat, faint feeling, red flashes, hallucinations, troubled breathing and shortness of breath.

Intake Instructions

Before taking Zyrtec (Cetirizine) perform a skin test to check whether you may have allergies to this medicine.

Always take oral doses of Zyrtec (Cetirizine) with a full glass of water or milk to lessen stomach upsets. If you are prescribed with the extended release tablet form of Zyrtec (Cetirizine), always swallow the tablet whole and never chew or crush it.


Overdosage of Zyrtec (Cetirizine) is harmful to children. Keep Zyrtec (Cetirizine) out or children's reach. Keep away from heat, moisture and direct sunlight. Heat and moisture may cause Zyrtec (Cetirizine) to break down.

Drug Information

Additional Information about Zyrtec (Cetirizine) may be obtained from an Online Pharmacy which offers the drug, or from a Canadian Pharmacy which sells it. Other information could also be obtained from a pharmacist or nurse or in the package insert of Zyrtec (Cetirizine).


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Zyrtec, Generic Zyrtec, Cetirizine