Drug used mainly to treat various allergies caused by the presence in the body of histamine, a substance that builds up in the body from an allergic reaction. Antihistamines usually cause some increased difficulty in urination.
Reduces histamine the chemical in the body that dilates the smallest blood vessels, constricts smooth muscle surrounding bronchial tubes and stimulates stomach secretions by acting on the tissues of the body.
A type of chemical present in many cold and allergy medicines, and some nonprescription sleep medicines. When taken at night as sleep aids, antihistamine-containing medicines may result in daytime drowsiness.
Antihistamine refers to a variety of compounds that oppose the actions of histamine and are used especially for treating allergic reactions (as hayfever), cold symptoms, and motion sickness. Many antihistamines can be purchased at your pharmacy without a prescription.
A medication that blocks the action of histamine in the body. Typical uses of Histamine subtype 1 blockers (H1 Blockers) include stopping or decreasing allergic reactions, nausea and dizziness associated with motion sickness, nausea from chemotherapy drugs, nasal decongestion, decreasing itching on the skin (topical antihistamine creams) and helping with sleep problems. Less well-known is the ability of antihistamines to decrease some kinds of pain. Non-drowsy antihistamines are relatively new and very popular for daytime allergy sufferers. Typical uses for histamine subtype 2 blockers (H2 Blockers) include stomach ulcers, heartburn and GERD.
a drug that counteracts the effects of histamine, which is a chemical found in body tissues and causes dilatation and increases permeability of small blood vessels, lowers blood pressure, contracts smooth muscles, increases gastric acid secretion, and increases heart rate. It is a mediator of immediate hypersensitivity and a neurotransmitter.
a drug that inhibits histamine, a compound that mediates inflammation and produces allergic reactions; antihistamines are a common ingredient in over-the-counter sleeping pills because of their sedative effect.
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 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 mucus 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 drug that stops the effects of histamine, a substance released during an allergic reaction. Antihistamines help reduce the sneezing and runny nose associated with nasal allergies; they are not as effective in relieving nasal congestion and may cause drowsiness.
A drug that opposes the action of histamine. The drug does not prevent the mast cells from releasing histamine, but the drug competes for the same receptor sites as histamine on receptor cells, blocking histamine's ability to bind to those sites, preventing or reducing the symptoms.
Prevents histamine, the chemical in body tissues that dilates smallest blood vessels, constricts smooth muscle surrounding bronchial tubes and stimulates stomach secretions, from acting on tissues of the body.
Antihistamine is a drug that counteract the effects of a substance in the body called histamine. It is used Used to reduce nausea and sickness. Antihistamine is a common ingredient in over-the-counter sleeping pills because of their sedative effect.
A drug that counteracts the effects of histamine, a chemical released from inflammatory cells during an allergic response, which affects mainly the eyes and nose e.g. hay fever. It has little effect on asthma however.
An antihistamine is a drug which serves to reduce or eliminate effects mediated by histamine, an endogenous chemical mediator released during allergic reactions, through action at the histamine receptor. Only agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines - other agents may have antihistaminergic action but are not true antihistamines.