We offer cetirizine dihcl / cetirizine dihydrochloride. cetirizine dihcl ep / inn a potent second-generation histamine h1 antagonist that is effective in the treatment of allergic rhinitis, chronic urticaria, and pollen-induced asthma. Unlike many traditional antihistamines, it does not cause drowsiness or anticholinergic side effects. specification: white crystalline powder, freely soluble in water, ph 1.2 to 1.8, assay min. 99% packing: 25 kg in hdpe drum please contact mr. Bhavin sagar for more information. - modasachemicals.