Antihistamine

Substance that opposes the action of histamine, an important mediator of allergic reactions and inflammation.

antihistamine

<pharmacology> A drug that counteracts the action of histamine. The antihistamines are of two types. The conventional ones, as those used in allergies, block the H1 histamine receptors, whereas the others block the H2 receptors. ... Synonym: antihistaminic. ... (18 Nov 1997) ...
Found on http://www.encyclo.co.uk/local/20973

antihistamine

(an″te-) (an″ti-his┬┤tә-mēn) a drug that counteracts the effects of histamine, a normal body chemical that among its actions is believed to cause the symptoms of persons who are hypersensitive to various allergens. While the term antihistamine can broadly include any agent that blo...
Found on http://www.encyclo.co.uk/local/21001

antihistamine

noun a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site
Found on https://www.encyclo.co.uk/local/20974

Antihistamine

A commonly used medication that releives symptoms of sneezing, itching, runny nose and ongestion by blocking histamine receptors. Although most antihistamines are considered safe during pregnancy, you should always contact your healthcare provider before taking any medication.
Found on http://www.pregnology.com/Pregnancy-dictionary/

antihistamine

a drug that blocks the action of histamine, a chemical messenger in the body. Antihistamines are used to prevent or alleviate allergic reactions and to reduce stomach acid production.
Found on http://www.encyclo.co.uk/local/22225

antihistamine

a drug that counteracts the action of histamine. The antihistamines are of two types. The conventional ones, as those used in allergies, block the H1 histamine receptors, whereas the others block the H2 receptors. Called also antihistaminic.
Found on http://users.ugent.be/~rvdstich/eugloss/DIC/dictio08.html

Antihistamine

a drug that relieves an allergic reaction by stopping the effects of histamine, the substance responsible for the negative symptoms associated with the reaction
Found on http://www.medichecks.com/glossary.cfm?ltr=A

Antihistamine

A substance that counteracts the effects of histamine.
Found on http://www.superglossary.com/Glossary/Health/Vitamins/

antihistamine

A type of drug that blocks the action of histamines, which can cause fever, itching, sneezing, a runny nose, and watery eyes. Antihistamines are used to prevent fevers in patients receiving blood transfusions and to treat allergies, coughs, and colds.
Found on http://www.cancer.gov/dictionary?expand=A

Antihistamine

An exogenous agent that inhibits the release of histamine, the amino acid derivative that stimulates vasodilation and permeability under many circumstances, particularly tissue irritation. The most common type of antihistamine, the H1 receptor antagonist, produces many moderate side effects, and the H2 receptor antagonist cimetidine is even more pr...
Found on http://www.swsbm.com/ManualsMM/MedHerbGloss2.txt

antihistamine

antihistamine (ăn"tihis'tumēn) , any one of a group of compounds having various chemical structures and characterized by the ability to antagonize the effects of histamine. Their principal use in medicine is in the control of allergies such as hay fever and hives. Some antihistam...
Found on http://www.infoplease.com/ce6/sci/A0804236.html

Antihistamine

Antihistamine medicine counteracts the action of histamine (a chemical released during an allergic reaction). For example loratadine, hydroxyzine.
Found on http://www.nhs.uk/Conditions/Pages/hub.xhtml

antihistamine

any of a group of synthetic drugs that selectively counteract the pharmacological effects of histamine (q.v.), following its release from certain ... [9 related articles]
Found on http://www.britannica.com/eb/a-z/a/83

antihistamine

Any of group of substances that block the effects of histamine, a chemical released during allergic reactions (see allergy). Antihistamines are used to relieve the symptoms of hay fever (allergic rhinitis) and hives (urticaria) and other rashes. They are sometimes used in cough and cold remedies bec...
Found on http://www.daviddarling.info/encyclopedia/A/antihistamine.html

antihistamine

Any substance that counteracts the effects of histamine. Antihistamines may occur naturally or they may be synthesized. H1 antihistamines are used to relieve allergies, alleviating symptoms such as runny nose, itching, swelling, or asthma. H2 antihistamines suppress acid production by the stomach, and a...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0022191.html

antihistamine

[n] - a medicine used to treat allergies and hypersensitive reactions and colds
Found on http://www.webdictionary.co.uk/definition.php?query=antihistamine
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