Zyrtec (Cetirizine) Drug Information: Description, User Reviews, Drug Side Effects, Interactions

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May 16, 2012

Zyrtec

Allergy Drugs: Prescription and OTC »

Allergy medications overview

The arsenal of allergy drugs includes dozens of medications that relieve allergy symptoms when confronted with a trigger known as an allergen. That trigger could be something from a plant, such as pollen, or something from an animal (pet dander, dust mites, cockroaches). Other allergy triggers include certain fragrances or chemical substances.

What causes a person's allergic reaction is highly individual. But the reactions are often universal: swelling and inflammation, especially around the eyes, nose, and throat, usually accompanied by itching.

Some allergy medications work against the effects of histamines, which are released during an allergic reaction. Other medications reduce swelling, affect the immune system, or affect release of other substances associated with allergic reactions.

Many allergy drugs are available without a prescription.

For what conditions are allergy medicatio...

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Zyrtec

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ZYRTEC®
(cetirizine hydrochloride) Tablets, Chewable Tablets and Syrup
Now available Over-The-Counter (OTC); No prescription needed.

DRUG DESCRIPTION

Cetirizine hydrochloride, the active component of ZYRTEC® (cetirizine) tablets and syrup, is an orally active and selective H₁-receptor antagonist. The chemical name is (±) - [2- [4- [ (4-chlorophenyl)phenylmethyl] -1- piperazinyl] ethoxy]acetic acid, dihydrochloride. Cetirizine hydrochloride is a racemic compound with an empirical formula of C₂₁H₂₅C_lN₂O₃•2HCl. The molecular weight is 461.82 and the chemical structure is shown below:

Zyrtec (cetirizine hydrochloride) structural formula illustration

Cetirizine hydrochloride is a white, crystalline powder and is water soluble. ZYRTEC (cetirizine) tablets are formulated as white, film-coated, rounded-off rectangular shaped tablets for oral administration and are available in 5 and 10 mg strengths. Inactive ingredients are: lactose monohydrate; microcrystalline cellulose; colloidal silicon dioxide; croscarmellose sodium; magnesium stearate; titanium dioxide; hypromellose; and polyethylene glycol.

ZYRTEC (cetirizine) chewable tablets are formulated as purple round tablets for oral administration and are available in 5 and 10 mg strengths. Inactive ingredients of the chewable tablets are: acesulfame potassium; artificial grape flavor; betadex, NF; blue dye; colloidal silicon dioxide; lactose monohydrate; magnesium stearate; mannitol; microcrystalline cellulose; natural flavor; red dye (carmine).

ZYRTEC (cetirizine) syrup is a colorless to slightly yellow syrup containing cetirizine hydrochloride at a concentration of 1 mg/mL (5 mg/5 mL) for oral administration. The pH is between 4 and 5. The inactive ingredients of the syrup are: banana flavor; glacial acetic acid; glycerin; grape flavor; methylparaben; propylene glycol; propylparaben; sodium acetate; sugar syrup; and water.

What are the possible side effects of cetirizine (All Day Allergy, All Day Allergy Children's, Indoor/Outdoor Allergy Relief, Zyrtec, Zyrtec Hives)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using this medication and call your doctor at once if you have any of these serious side effects:

fast, pounding, or uneven heartbeat;
weakness, tremors (uncontrolled shaking), or sleep problems (insomnia);
severe restless feeling, hyperactivity;

Read All Potential Side Effects and See Pictures of Zyrtec »

What are the precautions when taking cetirizine (Zyrtec)?

Before taking cetirizine, tell your doctor or pharmacist if you are allergic to it; or to hydroxyzine; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history. Do not self-treat with this medication without consulting your doctor first if you have certain medical conditions such as: kidney disease, liver disease.

This drug may make you drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

If you have hives and your doctor has prescribed cetirizine, or if...

Read All Potential Precautions of Zyrtec »

Last reviewed on RxList: 5/16/2007
This monograph has been modified to include the generic and brand name in many instances.