<prompt> H1 antagonist has all the function exceptAnti pruriticSedationDecrease gastric acid secretionAntiveigo  <response>: H1 antagonists, also called H1 blockers, are a class of medications that block the action of histamine at the H1 receptor, helping to relieve allergic reactions. H1-antihistamines are clinically used in the treatment of histamine-mediated allergic conditions. These indications may include: Allergic rhinitis Allergic conjunctivitis Allergic dermatological conditions contact dermatitis Rhinorrhea Runny nose Uicaria Angioedema Diarrhea Pruritus atopic dermatitis, insect bites Anaphylactic or anaphylactoid reactions--adjunct only Nausea and vomiting Sedation first-generation H1-antihistamines Refer kDT 6e 160 