They already have compounds in development to block the new histamine receptor, dubbed H4, to treat asthma and itching—another allergy-related symptom for which typical antihistamines fall short.

One kind is rich in histamine, one kind triggers the release of histamine, and others block DAO production. It's vital to ...

investigated the potential of the histamine H1 blocker hydroxyzine to improve sleep in patients with cirrhosis and minimal hepatic encephalopathy. All 35 patients (mean age 56 years [range 36–69 ...