Tag: Histamine blockers

In 2021, nearly one-third of U.S. adults reported having a seasonal allergy, eczema, or food allergy [1.6.1]. For many, relief comes from a common class of drugs. But what is in antihistamines that makes them effective at calming an allergic response?

According to Drugs.com, a white, oval tablet with the imprint "4H2" is identified as Cetirizine Hydrochloride 10mg. This second-generation antihistamine is a widely available and effective option for treating symptoms related to indoor and outdoor allergies, making the 4H2 pill a familiar sight for millions of allergy sufferers.