An agent used to counteract the effects of histamine production in allergic reactions.
Drug that antagonises the actions of histamine; those that block histamine Hh receptors are used to treat allergic reactions; those that block H2 receptors are used to treat peptic ulcers.
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 H 1 receptor antagonist, produces many moderate side effects, and the H2 receptor antagonist cimetidine is even more problematic. That they are so commonly used can lull both physician and patient into trivializing their iatrogenic potential. Histamines, which are most abundant in the skin, respiratory, and GI tract mucous membranes, help heal; using antihistamines to inhibit the healing response for the whole body simply in order to lessen the acute but physiologically superficial symptoms of something like hay fever is to risk many subtle side effects.
A class of medications that can attenuate or block the inflammatory response–triggering action of endogenous histamine. Antihistamines are also useful as sedatives or hypnotics and may be used to reduce anxiety symptoms in patients with mild symptoms.
An agent that neutralizes the effect or inhibits production of histamine, an immune-system substance that promotes inflammation.
A substance that improves allergic symptoms by blocking the action of histamine.
A common type of allergy medication that blocks a chemical called histamine, which is found in the skin, the nasal and respiratory passages, the stomach, and elsewhere. Histamine plays a key role in allergic reactions, causing inflammation, hives, itching, and constriction of the airways. Antihistamines are useful for treating hay fever, hives, rashes, and motion sickness.
Drugs that counteract allergic symptoms produced when histamine is released in the body.
Agent that treats allergic conditions; counteracts effects of histamine (which produces capillary dilation and, in larger doses, hemoconcentration).
A drug that counters effect of histamine which is naturally produced by the body tends to dry up the mucous membranes in the nose and may cause drowsiness.
A drug used to control the effects of an allergy which releases histamine, or reduces gastric acid in the stomach for the treatment of gastric ulcers.
Compounds that inhibit the release and/or synthesis of histamines.
Drug, used to treat allergies, hypersensitivity reactions, and colds, that works to reduce the effects of histamine (e.g., chlorpheniramine maleate, Teldrin).
Pharmacological agents used to counteract histamine; frequently used for allergic response.
Any drug that counteracts histamine, a chemical released within the body during an allergic reaction. Antihistamines do not alter the cause of the reaction but suppress the symptoms associated with the release of histamine, such as swelling, irritation, and watery discharge from the eyes and nose. Antihistamines work by blocking histamine receptors.
A drug that inhibits some of the effects of histamine in the body, in particular its role in allergic reactions. Examples are chlorpheniramine, diphenhydramine, and mepyramine. Antihistamines are used mainly for the relief of hay fever, pruritus (itching), rhinitis, urticaria (nettle rash), and other allergic reactions. Many antihistamines, e.g. cyclizine and promethazine, also have strong ‘antiemetic activity and are used to prevent motion sickness. The most common side-effect of antihistamines is drowsiness and because of this they are sometimes used to promote sleep. Other side-effects include dizziness, blurred vision, tremors, digestive upsets, and lack of muscular coordination.
A drug that opposes the action of histamine. Although there are two classes of histamine-blocking drugs, the term antihistamine is typically used to describe agents that block the action of histamines on H1 receptors. These agents are used to treat allergies, hives, and other local and systemic hypersensitivity (allergic) reactions. Side effects of first generation antihistamines (e.g, chlorpheniramine) include sedation, drying of mucous membranes, and urinary retention. Some first-generation antihistamines can also be used to treat insomnia, motion sickness, or vertigo. Second-generation agents (e.g., loratadine) tend to be less sedating, but still have beneficial effects in the treatment of allergies.
There exists a group of pharmacological compounds that are intended to inhibit the biological activity of histamines, thereby mitigating the consequences of inflammation.
An antihistamine is a medication that hinders the effects of histamine. Histamine is responsible for widening capillaries, constricting smooth muscles, and stimulating the secretion of gastric acid.
A substance that opposes the release of histamine in the body tissues. Histamine is naturally present in the tissues and acts as a potent blood vessel dilator. Antihistamine medications are taken orally in the form of tablets or capsules to manage allergic conditions. They are also applied topically as ointments to alleviate itching and swelling caused by irritants like wasp stings, bee stings, and mosquito bites.