4H2 4H2 Pill - white oval, 10mm Pill with imprint4H2is White, Oval and has been identified as Cetirizine Hydrochloride 10 mg. It is supplied by Perrigo Company. Cetirizine is used in the treatment ofUrticaria;Allergic Rhinitis;Allergies;Food Allergiesand belongs to the drug classantihistamines....