H1 receptor antagonist

An H1 receptor antagonist is a medication that blocks certain receptors in the body called H1 receptors, which are involved in allergic reactions. When these receptors are activated by allergens like pollen or dust, they cause symptoms such as sneezing, itching, runny nose, and watery eyes. By blocking these receptors, H1 antagonists help reduce or prevent these allergy symptoms. They are commonly used in allergy medications and are effective in providing relief from hay fever, hives, and other allergic conditions.