Histamine stimulates the cells to release chemicals that produce effects that we associate with allergy, including welts, itching, and tissue swelling.
Loratadine blocks one type of histamine receptor (the H1 receptor) and thus prevents activation of cells with H1 receptors by histamine.
Precautions and Warnings:► Second generation antihistamines are less likely to interact with other drugs like sedatives► Do not use antihistamines in large amounts or for longer than recommended.► Use alcohol cautiously if you are on antihistamines► While taking antihistamines, do not drive or use machinery that could harm you if you are not alert ► Consult your doctor before using antihistamines if you have glaucoma, high blood pressure, hyperthyroidism, heart disease, stomach problems, liver disease, kidney disease and diabetes► Inform your healthcare provider if you are pregnant or breastfeeding.► Store in cool, dry place.
Protect from heat and light Over-the-counter (OTC) medications are medications that you can buy directly from a chemist shop without a doctor's prescription.
Treatment of chronic rhinitis and post nasal drip are dependent upon the type of rhinitis condition.
Fexofenadine is an oral, "second generation" antihistamine that is used to treat the signs and symptoms of allergy and hives.
Antihistamines make your sleepy by antagonizing central histimine-1 (H-1) receptors in the brain.Topical antihistamine products are where antihistamines have been incorporated in creams, nasal sprays and other agents that can be applied locally (for example to the skin) to treat allergic reactions.Antihistamines block the histamine receptors, which when activated cause allergic reactions such as hay fever, itching and rash.These are usually not prescription drugs and can be purchased at retailers over-the-counter.They do, however, have the potential for negative effects if taken with other drugs, so let your doctor know if you are taking more than one medication.