Medication Summary
Tailor therapy according to the patient's specific needs for symptomatic relief. Patients may be started on oral H1 antihistamine and/or oral disodium cromoglycate with or without the use of a potent topical steroid for selected cutaneous lesions. In patients with a limited number of lesions, intralesional corticosteroid injections are an additional therapeutic option. Oral histamine H2 antagonists may be administered in addition to an oral H1 antihistamine.
Antihistamines
Class Summary
Relieve pruritus and flushing.
Hydroxyzine (Atarax, Atozine, Vistaril)
Antagonizes H1 receptors in periphery. May suppress histamine activity in subcortical region of CNS.
Mast cell stabilizers
Class Summary
Cromolyn is a mast cell stabilizer that improves diarrhea, flushing, headaches, vomiting, urticaria, abdominal pain, nausea, and itching in some patients.
Cromolyn sodium (Gastrocrom)
Inhibits degranulation of sensitized mast cells following exposure to specific antigens. Available as an oral concentrate solution in 5-mL ampules to mix with water and is administered at least 30 min ac. Each 5-mL ampule contains 100 mg of cromolyn sodium, USP, in purified water. Each foil pouch contains 8 ampules.
Histamine H2 antagonists
Class Summary
Addition of H2 antagonist to H1 antagonist helps control pruritus and whealing. In addition, GI symptoms associated with hyperchlorhydria, such as peptic ulcer disease and gastritis, respond well to this medication.
Cimetidine (Tagamet)
H2 antagonist that when combined with an H1 type may be useful in treating itching and flushing in urticaria and contact dermatitis that do not respond to H1 antagonists alone. Use in addition to H1 antihistamines.
Vasopressors
Class Summary
For patients with systemic disease or extensive symptoms.
Epinephrine (EpiPen)
DOC for treating anaphylactoid reactions. Has alpha-agonist effects that include increased peripheral vascular resistance, reversed peripheral vasodilatation, systemic hypotension, and vascular permeability. Beta-agonist effects include bronchodilatation, chronotropic cardiac activity, and positive inotropic effects.
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