Have to blow my nose every couple of minutes.
Zyrtec - How long after I take my first pill should I get some relief from allergies?
Question posted by vaughch on 1 May 2013
Last updated on 17 April 2017
Zyrtec is a fast acting OTC allergy medication that begins to take affect in as little as one hour after taking the first dose and works for up to 24 hours.
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