Antianaphylaxis(antihistamines)-and-antidotes

Acacia gum

Brompheniramine

Brompheniramine is an antihistamine drug of the propylamine class. It is readily available over the counter and is indicated for the treatment of the symptoms of the common cold and allergic rhinitis, such as runny nose, itchy eyes, watery eyes, and sneezing. It is a first-generation antihistamine. It has antidepressant properties, inhibiting reuptake of the neurotransmitter serotonin.

Cetirizine Hydrochloride

Cetirizine Hydrochloride is an antihistamine that treats symptoms, such as itching, runny nose, watery eyes, and sneezing from hay fever (allergic rhinitis) and other allergies, such as allergies to molds and dust mites. It is available in generic form. Common side effects include: drowsiness, fatigue, dizziness, and dry mouth.

Clocinizine

Clocinizine is an first-generation antihistamine of the phenylpiperazine class.

Desloratadine

Desloratadine is a drug used to treat allergies. It is an active metabolite of loratadine. It is a tricyclic antihistamine, which has a selective and peripheral H₁-antagonist action. It is an antagonist at histamine H₁ receptors, and an antagonist at all subtypes of the muscarinic acetylcholine receptor. It has a long-lasting effect and in moderate and low doses, does not cause drowsiness because it does not readily enter the central nervous system.

Dexchlorpheniramine

Dexchlorpheniramine is an antihistamine with anticholinergic properties used to treat allergic conditions such as hay fever or urticaria. It is the pharmacologically active dextrorotatory isomer of chlorpheniramine and seems to possess no advantage over the more common parent drug.

Dimetindene Maleate

Dimetindene Maleate is a potent antihistamine with a prolonged duration of action. It is used in hypersensitivity reactions, rhinitis, pruritus, and in some common cold remedies, allergies, urticaria, and itching dermatoses.

Ebastine

Ebastine is a H1 antihistamine with low potential for causing drowsiness. It does not penetrate the blood–brain barrier to a significant amount and thus combines an effective block of the H1 receptor in peripheral tissue with a low incidence of central side effects, i.e. seldom causing sedation or drowsiness. Ebastine is a second-generation H1 receptor antagonist that is indicated mainly for allergic rhinitis and chronic idiopathic urticaria.

Homochlorcyclizine

Homochlorcyclizine is an antihistamine which has been marketed in Japan since 1965. It is used in the treatment of allergies and other conditions. It also has some anticholinergic, antidopaminergic, and antiserotonergic properties.

Levocetirizine

Levocetirizine is a third-generation non-sedative antihistamine, developed from the second-generation antihistamine cetirizine.It is the L-enantiomer of the cetirizine racemate. Levocetirizine works by blocking histamine receptors. It does not prevent the actual release of histamine from mast cells, but prevents it binding to its receptors.