Cetirizine (aka - zyrtec) is an anti-histamine, usually prescribed for runny noses, sneezing, nasal itching, and post-nasal drip, symptoms commonly seen in allergic individuals. It became an OTC (over-the-counter) medication just a few months ago.
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Cetirizine is a drug used and prescribed in cases of allergic reactions. There is a generic brand of this medication on the market as well for those who can't afford the real medication.