antihistamín

Antihistamine is a type of medication that blocks the action of histamine. Histamine is a natural chemical produced by the body's immune system that plays a role in allergic reactions. When an allergen, such as pollen or dust, enters the body, histamine is released. This release causes symptoms like itching, sneezing, runny nose, and hives. Antihistamines work by attaching to histamine receptors in the body, preventing histamine from binding to them and triggering these symptoms.

There are several types of antihistamines, broadly categorized into first-generation and second-generation. First-generation antihistamines, like diphenhydramine, are effective but often cause drowsiness and other side effects. Second-generation antihistamines, such as loratadine and cetirizine, are less likely to cause drowsiness and are generally preferred for daytime use. Antihistamines are commonly used to treat symptoms of allergies, including hay fever, hives, insect bites, and allergic reactions to medications or food. They can also be used to treat motion sickness and insomnia due to their sedative properties. Antihistamines are available in various forms, including pills, liquids, nasal sprays, and eye drops. It is important to follow dosage instructions and consult a healthcare professional if you have any concerns or pre-existing medical conditions.