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What is an Antihistamine Used For?

Antihistamines are available commonly in both prescription and over-the-counter forms, depending on the type of medicine that is necessary. Antihistamines function in order to obstruct the actions of histamine. Histamine is a naturally bodily chemical that results in the uncomfortable symptoms that are often associated ailments such as the common cold, influenza and both seasonal and perennial allergies.

  1. Function

    • Antihistamines fight against histamine inside of the body. They battle against histamine for the receptor sites of histamines. Histamines can result in symptoms such as watery eyes, nasal congestion, itchy nose and sneezing. When antihistamines situate themselves at these sites, they can stop histamine from causing the aforementioned symptoms.

    Usage

    • Antihistamines come in various forms. These forms include spray, liquid, tablet, chewable tablet and capsule form. Antihistamines are generally taken on a daily basis. However, since they are all different, how many times a day you take them depends on the traits of the specific antihistamine as well as the kind of dosage that is necessary.

    Caution

    • Use of antihistamines is not appropriate for all people. Some people are advised against taking antihistamines for any purpose. These people include those with a medical condition known as narrow-angle glaucoma, females that are presently breastfeeding babies and those who are taking an MAO (monoamine oxidase) inhibitor.

    Common Side Effects

    • A lot of antihistamines can lead to some side effects. In general, the side effects are not considered to be serious. They usually fade quickly as the body gets used to the antihistamine. These side effects are urine retention, drowsiness, blurry vision and dry mouth. If you have any of these antihistamine side effects, and if they get worse with time or do not subside, speak with your physician.

    Drug Interactions

    • When using antihistamines, it is important to try not to experience drug and substance interactions. Drug and substance interactions can happen when more than one medication is being taken simultaneously. These interactions can reduce the effectiveness of the medicines involved. You must inform your doctor of the medicines you are taking. Some medications and substances that could interact with antihistamines include tranquilizers, various sleep preparations, alcohol, MAO inhibitors and sedatives.

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