allergic reactions in most cases due to the fact that under the influence of certain substances (allergens) in the body begins to produce biologically active substances that lead to the development of allergies.The most active of these substances is histamine.In a healthy body, it is within the so-called mast cells in an inactive state.
When an allergen enters mast cells release histamine, which leads to the appearance of allergy symptoms: redness, swelling, rash, runny nose, cough, bronchospasm, lowering blood pressure, etc.In order to prevent or eliminate allergic reactions, doctors prescribe drugs that are able to influence the metabolism - they reduce the amount of histamine released by mast cells and neutr main purpose of the appointment of antihistamine drugs - is to eliminate and / or prevent allergy symptoms (respiratory, food and contact, pharmacological).
What are antihistamines
Classical antihistamine drugs - "Diphenhydramine", "Suprastin", "Promethazine", "Diazolin", "Tavegil", "Fenkarol" they used for many years.All the above products are available in a form intended for oral administration (tablets, capsules, syrups), "Diphenhydramine" is also available in the form of candles.Some antihistamines ("Diphenhydramine", "Suprastin", "Promethazine") have strong sedative effect, therefore they should be taken with caution when working that requires quick reactions, or exchanged for drugs that have a sedative effect is negligible. to quickly apply the effect of intravenous and intramuscular injections.
Actions not associated with anti-allergic effect, numerous, and each product are expressed in different ways.Different dose and frequency of administration, therefore antihistamines must appoint a physician.Preventive effect of antihistamines is not always expressed so completely to prevent allergies.Therefore, if a substance known allergen should avoid contact with them.If contact can not be avoided (eg in the case of allergy to poplar fluff), in this case, the appointment of antihistamines is justified.